{"id":3218,"date":"2026-10-28T12:33:58","date_gmt":"2026-10-28T12:33:58","guid":{"rendered":"https:\/\/www.cybernetik.com\/blog\/?p=3218"},"modified":"2026-10-29T06:35:19","modified_gmt":"2026-10-29T06:35:19","slug":"rotary-airlock-valves-working-principle-applications-in","status":"publish","type":"post","link":"https:\/\/www.cybernetik.com\/blog\/process\/rotary-airlock-valves-working-principle-applications-in\/","title":{"rendered":"Rotary Airlock Valves: Working Principle, Applications, and Benefits"},"content":{"rendered":"\n<div class=\"wp-block-group has-white-color has-text-color has-background has-link-color wp-elements-1ee8629dbc712ddf132d1caad3fa6a15 is-layout-constrained wp-container-core-group-is-layout-800b4e77 wp-block-group-is-layout-constrained\" style=\"border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-left-radius:5px;border-bottom-right-radius:5px;background-color:#12263a;margin-bottom:20px;padding-top:10px;padding-right:30px;padding-bottom:30px;padding-left:30px\">\n<h2 class=\"wp-block-heading has-white-color has-text-color has-link-color wp-elements-19215f1e6a1396f83f0257af42631315\" style=\"line-height:1.4\">Key takeaways<\/h2>\n\n\n\n<div style=\"height:6px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_d3c41a-e2:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_d3c41a-e2 ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_d3c41a-e2 ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_d3c41a-e2 .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_d3c41a-e2 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items3218_d3c41a-e2 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items3218_d3c41a-e2 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items3218_d3c41a-e2 ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items3218_d3c41a-e2 kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-3218_731214-37 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_731214-37\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Rotary airlock valves transfer powders and granules between areas with different pressure levels while controlling material flow and limiting air leakage.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_3b3bf4-b2 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_3b3bf4-b2\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Key components include the housing, rotor, shaft seals, bearings, end covers, and drive, with rotor-to-housing clearance influencing sealing performance, wear, and operating reliability.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_cb1ce0-f0 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_cb1ce0-f0\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Drop-through, blow-through, side-entry, quick-clean, heavy-duty, and explosion-isolating designs serve different material properties, conveying requirements, hygiene needs, and safety conditions.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_8f41b1-aa .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_8f41b1-aa\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Correct valve sizing depends on pocket volume, rotor speed, fill efficiency, bulk density, pressure difference, temperature, and required throughput to maintain reliable feeding without excessive wear.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_9921a2-0a .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_9921a2-0a\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Regular inspection of throughput, air leakage, rotor clearances, seals, and product buildup helps prevent jamming, dust escape, reduced capacity, and unplanned downtime.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_a7ef0d-c3 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_a7ef0d-c3\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Cybernetik offers CT and Combo Valves for controlled powder and granule feeding, with flow control up to 6,000 kg\/hr, SS304\/SS316 construction, hygienic GMP design, and options for hazardous-area applications.<\/span><\/li>\n<\/ul><\/div>\n<\/div>\n\n\n\n<p class=\"has-link-color wp-elements-39bcbb519140058ef2b5748dc470e4b7 wp-block-paragraph\">Bulk solids rarely move from one place to another at the same pressure. A silo may sit at atmospheric pressure while the pneumatic line below it runs under pressure. A dust collector operates under suction while the bin beneath it does not. Material has to pass between these zones without letting air rush through with it, and that is the job of a rotary airlock valve.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A rotary airlock valve is a feeding device in which a vaned rotor turns inside a closely fitted housing. Material falls into the pockets between the vanes at the inlet, is carried round and drops out at the outlet, while the tight clearance between rotor and housing limits air passing between the two sides. It is used to discharge silos, hoppers, cyclones and dust collectors, to feed pneumatic conveying lines and to meter powders and granules at a controlled rate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide explains how a rotary airlock works, the main types and rotor designs, where they are used, how to size and select one, and what keeps it running reliably.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How a Rotary Airlock Valve Works<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Picture a revolving door laid on its side. The rotor turns slowly, and each pocket passes under the inlet, fills with material, rotates to the bottom of the housing and empties into the outlet. The pocket then travels back up, empty, to fill again.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two things happen at once. The valve meters material, since each turn delivers a roughly fixed volume, so feed rate follows rotor speed. And it forms a seal, because there is never an open path straight through the valve. At any moment, several vanes sit between the inlet and the outlet, each with only a small clearance to the housing wall.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Why it is never perfectly airtight<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A rotary airlock limits air flow rather than stopping it completely. Air passes through two routes. Some leaks through the small gaps at the vane tips and sides. The rest is carried in the empty pockets as they return to the inlet, holding air at the outlet pressure and releasing it when they reach the inlet side.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That leakage matters most when the pressure difference is high or the material is fine. Air rising through the inlet can slow or stop material falling into the pockets. Many installations therefore include a vent that draws the leakage air away before it reaches the incoming product, which keeps throughput steady.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Parts of a Rotary Airlock Valve<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Part<\/strong><\/th><th><strong>What it does<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Housing<\/td><td>The cast or fabricated body with an inlet on top, an outlet below and a bore the rotor turns inside<\/td><\/tr><tr><td>Rotor<\/td><td>A shaft with radial vanes that form pockets, usually six to ten, which carry material from inlet to outlet<\/td><\/tr><tr><td>End covers<\/td><td>Plates on each side of the housing that close the bore and carry the bearings and seals<\/td><\/tr><tr><td>Shaft seals<\/td><td>Packing, lip seals or air-purged seals that stop powder and air escaping along the shaft<\/td><\/tr><tr><td>Bearings<\/td><td>Mounted outside the product zone so they stay clean and support the rotor accurately<\/td><\/tr><tr><td>Drive<\/td><td>A geared motor, often with a variable frequency drive, turning the rotor at a controlled speed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-link-color wp-elements-162753497983e6429868aec22b2ace6e wp-block-paragraph\">The clearance between rotor and housing is the single most important dimension in the valve. Tight clearances seal better but risk contact if the rotor expands with heat or a hard particle wedges in the gap. Looser clearances are more forgiving but leak more. Good designs choose the clearance for the material, pressure and temperature rather than using one figure for every application.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-full has-custom-border\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1393\" height=\"867\" src=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/09\/Motorised-Butterfly-Valves-Applications-and-Selection-Guide.webp\" alt=\"\" class=\"wp-image-2878\" style=\"border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-left-radius:5px;border-bottom-right-radius:5px\" srcset=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/09\/Motorised-Butterfly-Valves-Applications-and-Selection-Guide.webp 1393w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/09\/Motorised-Butterfly-Valves-Applications-and-Selection-Guide-300x187.webp 300w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/09\/Motorised-Butterfly-Valves-Applications-and-Selection-Guide-1024x637.webp 1024w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/09\/Motorised-Butterfly-Valves-Applications-and-Selection-Guide-768x478.webp 768w\" sizes=\"(max-width: 1393px) 100vw, 1393px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Types of Rotary Airlock Valves<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The basic principle stays the same, but the housing and rotor are adapted to the job.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Type<\/strong><\/th><th><strong>How it differs<\/strong><\/th><th><strong>Typical use<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Drop-through<\/td><td>Material falls in from above and drops straight out below<\/td><td>Discharging hoppers, silos, cyclones and dust collectors<\/td><\/tr><tr><td>Blow-through<\/td><td>The conveying air passes through the rotor pockets and sweeps them clean<\/td><td>Feeding dilute phase pneumatic conveying lines, especially with sticky or fine powders<\/td><\/tr><tr><td>Side-entry<\/td><td>Material enters at an angle so pockets fill partly and the rotor does not shear particles<\/td><td>Pellets, granules and fragile products that would be cut or crushed<\/td><\/tr><tr><td>Quick-clean<\/td><td>Rotor slides out on rails or the end cover swings open without tools<\/td><td>Food and pharmaceutical plants with frequent product changes<\/td><\/tr><tr><td>Heavy-duty or abrasion-resistant<\/td><td>Thicker sections, hardened surfaces or replaceable liners<\/td><td>Cement, minerals, sand and other abrasive materials<\/td><\/tr><tr><td>Explosion-isolating<\/td><td>Built and certified to stop a flame or pressure wave passing through the valve<\/td><td>Combustible dusts where the valve forms part of the explosion protection<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Rotor designs<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Within each type, the rotor itself can be configured to suit the product.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Rotor option<\/strong><\/th><th><strong>When it helps<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Open-end rotor<\/td><td>Simple and easy to clean, with vanes running to the end covers<\/td><\/tr><tr><td>Closed-end (shrouded) rotor<\/td><td>End discs reduce wear on the end covers with abrasive products and limit leakage<\/td><\/tr><tr><td>Adjustable or replaceable tips<\/td><td>Lets clearance be restored after wear without replacing the whole rotor<\/td><\/tr><tr><td>Flexible tips<\/td><td>Reduce shearing and jamming with lumpy or fibrous products, at the cost of a less tight seal<\/td><\/tr><tr><td>Scalloped (rounded) pockets<\/td><td>Help sticky powders release cleanly at the outlet<\/td><\/tr><tr><td>Reduced pocket volume<\/td><td>Gives finer control at low feed rates<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Where Rotary Airlock Valves Are Used<\/strong><\/h2>\n\n\n\n<p class=\"has-link-color wp-elements-e9f82d046faaf01a86d78d02fd6d8778 wp-block-paragraph\">Rotary airlocks appear wherever powders and granules cross a pressure boundary or need a steady feed. They are one of a wider family of devices that control solids and liquids in a plant, set out in the guide to <a href=\"https:\/\/www.cybernetik.com\/blog\/process\/industrial-valves-types-working-principle-in\/\">industrial valves<\/a>.<\/p>\n\n\n\n<p class=\"has-link-color wp-elements-6d405b26dcf447cc2ea388fc9eeb8c5f wp-block-paragraph\"><\/p>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_d5e4e5-b4:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_d5e4e5-b4 ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_d5e4e5-b4 ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_d5e4e5-b4 .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_d5e4e5-b4 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items3218_d5e4e5-b4 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items3218_d5e4e5-b4 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items3218_d5e4e5-b4 ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items3218_d5e4e5-b4 kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-3218_0c604a-cd .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_0c604a-cd\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Pneumatic conveying. <\/strong>Feeding material into a pressure line, or discharging it from a vacuum receiver, while holding the line pressure.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_bee27c-2a .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_bee27c-2a\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Dust collectors and cyclones. <\/strong>Emptying collected dust continuously without breaking the suction the collector relies on.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_e634ea-e4 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_e634ea-e4\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Silos, bins and hoppers. <\/strong>Controlling discharge into conveyors, mixers or packing machines.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_64ef99-d4 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_64ef99-d4\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Process feeding. <\/strong>Metering material into mixers, dryers, mills and extruders at a set rate.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_17665c-78 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_17665c-78\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Explosion protection. <\/strong>Certified valves can isolate one part of a plant from a dust explosion in another.<\/span><\/li>\n<\/ul><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Industries using them include food and flour milling, sugar, spices, dairy powders, pharmaceuticals, chemicals, plastics, cement, minerals and animal feed. The design changes with the product: a valve for milk powder needs hygienic construction and easy cleaning, while one for cement needs wear resistance above all.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Benefits of Using a Rotary Airlock<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_6b5bb8-49:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_6b5bb8-49 ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_6b5bb8-49 ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_6b5bb8-49 .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_6b5bb8-49 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items3218_6b5bb8-49 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items3218_6b5bb8-49 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items3218_6b5bb8-49 ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items3218_6b5bb8-49 kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-3218_02e0a1-65 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_02e0a1-65\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Holds pressure between process zones. <\/strong>Keeps pneumatic lines, collectors and receivers working at their design pressure.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_ccd016-35 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_ccd016-35\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Steady, adjustable feed. <\/strong>Feed rate follows rotor speed, which a variable frequency drive can set precisely.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_03082e-60 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_03082e-60\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Dust containment. <\/strong>An enclosed valve keeps fine powder inside the system rather than in the workplace.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_732246-3b .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_732246-3b\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Protection for downstream equipment. <\/strong>A controlled feed avoids surges that overload conveyors, mixers and mills.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_63cb17-38 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_63cb17-38\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Compact and continuous. <\/strong>Feeds without stopping, in a small footprint under a hopper or collector.<\/span><\/li>\n<\/ul><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Rotary Airlock or Another Feeder?<\/strong><\/h2>\n\n\n\n<p class=\"has-link-color wp-elements-90c38f34f9ea02ae2d7e2d180c4400e8 wp-block-paragraph\">A rotary airlock is not the only way to move material out of a vessel, and it is worth comparing it with the alternatives. For many applications the choice comes down to whether a pressure seal is needed, as covered in more detail in the article on <a href=\"https:\/\/www.cybernetik.com\/blog\/process\/flow-control-valves-types-working-principle-in\/\">flow control valves<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Device<\/strong><\/th><th><strong>Strength<\/strong><\/th><th><strong>Limitation<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Rotary airlock valve<\/td><td>Seals pressure while feeding at a steady, adjustable rate<\/td><td>Some air leakage is unavoidable, and clearances wear with abrasive products<\/td><\/tr><tr><td>Screw feeder<\/td><td>Accurate metering of powders over a wide range<\/td><td>Does not seal against pressure on its own<\/td><\/tr><tr><td>Double flap or dump valve<\/td><td>Good seal for coarse, hot or abrasive material<\/td><td>Feeds in batches rather than continuously<\/td><\/tr><tr><td>Slide gate or butterfly valve<\/td><td>Simple shut-off below hoppers and silos<\/td><td>Isolates flow but does not meter it<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-link-color wp-elements-529090a64e26c8c58f1f15e88ea4d5e5 wp-block-paragraph\">Plants often combine devices. A slide gate above a rotary airlock lets the valve be removed for maintenance without emptying the silo, and a <a href=\"https:\/\/www.cybernetik.com\/blog\/process\/horizontal-screw-conveyors-design-working-principle-in\/\">screw conveyor<\/a> after the airlock can carry material on to the next process step.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-7387b849 wp-block-group-is-layout-flex\">\n<p class=\"has-text-align-left wp-block-paragraph\" style=\"font-size:29px\"><img decoding=\"async\" class=\"wp-image-503\" style=\"width: 65px\" src=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/Frame-1.svg\" alt=\"\"><strong>&#8220;Every bulk material handling application has unique operating demands. Selecting the right rotary airlock valve helps manufacturers achieve reliable flow, effective sealing, and consistent performance.&#8221;<\/strong><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-luminous-vivid-amber-color has-text-color has-link-color has-medium-font-size wp-elements-3cc671b03a440f3700a6ec32f9fcb913 is-horizontal is-content-justification-left is-nowrap is-layout-flex wp-container-core-group-is-layout-e8523bbf wp-block-group-is-layout-flex\" style=\"text-decoration:none\">\n<div class=\"wp-block-group is-content-justification-left is-layout-constrained wp-container-core-group-is-layout-d9c85f36 wp-block-group-is-layout-constrained\">\n<figure class=\"wp-block-image alignwide size-thumbnail\" style=\"margin-top:0;margin-right:0;margin-bottom:0;margin-left:0\"><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2-150x150.png\" alt=\"\" class=\"wp-image-898\" srcset=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2-150x150.png 150w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2-300x300.webp 300w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2.webp 512w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/process.cybernetik.com\/\" data-type=\"link\" data-id=\"https:\/\/process.cybernetik.com\/\">Cybernetik process automation team<\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\" style=\"font-size:34px\">See it in action<\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Rotary Valve | Cybernetik Product Catalog\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/xg9XSVGAJ3c?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How to Size a Rotary Airlock<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Throughput depends on four things: the volume of the rotor pockets per turn, the rotor speed, how full the pockets get, and the bulk density of the material. Multiplied together, they give the mass delivered per hour.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The figure that catches buyers out is fill efficiency. Pockets rarely fill completely, and they fill less as speed rises, because there is less time for material to drop in. Leakage air rising through the inlet reduces filling further. For this reason, a valve is usually sized so that it reaches the required rate at a moderate speed, with room to increase if needed, rather than running near its top speed all the time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bulk density deserves the same care. Aerated powder from a pneumatic receiver can be much lighter than the same powder settled in a bag. Sizing on the settled figure can leave the valve short of capacity in practice.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Selection Checklist<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_f502fe-df:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_f502fe-df ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_f502fe-df ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_f502fe-df .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_f502fe-df ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items3218_f502fe-df ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items3218_f502fe-df ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items3218_f502fe-df ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items3218_f502fe-df kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-3218_f89484-92 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_f89484-92\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Material. <\/strong>Particle size, bulk density, flowability, stickiness, abrasiveness and fragility.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_f34c9d-5e .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_f34c9d-5e\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Throughput. <\/strong>Required rate in kg\/hr, including peaks, and whether metering accuracy matters.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_77b2b6-f0 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_77b2b6-f0\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Pressure difference. <\/strong>The pressure or vacuum on each side, which sets clearance, sealing and venting needs.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_1b4014-2e .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_1b4014-2e\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Temperature. <\/strong>Hot products need clearances that allow for rotor expansion.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_a15bc0-78 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_a15bc0-78\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Hygiene. <\/strong>Material of construction, surface finish and quick-clean features for food and pharmaceuticals.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_3cb5d4-f5 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_3cb5d4-f5\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Hazardous area. <\/strong>Whether the dust is combustible and the valve must be explosion-proof or explosion-isolating.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_e8723c-50 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_e8723c-50\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Connections and control. <\/strong>Flange sizes, drive arrangement, speed control and monitoring signals.<\/span><\/li>\n<\/ul><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Installation Tips<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Many airlock problems start with the way the valve is installed rather than the valve itself. A few details make a noticeable difference.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_210d30-68:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_210d30-68 ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_210d30-68 ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_210d30-68 .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_210d30-68 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items3218_210d30-68 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items3218_210d30-68 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items3218_210d30-68 ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items3218_210d30-68 kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-3218_dda56c-5d .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_dda56c-5d\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Give the inlet a full, straight entry. <\/strong>A transition that matches the valve inlet lets material fall evenly across the rotor, so pockets fill along their full length.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_0f25e2-55 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_0f25e2-55\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Plan the vent. <\/strong>Where the valve feeds a pressure line, a vent connection above the rotor carries leakage air away before it disturbs the incoming product.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_5ed4d2-8c .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_5ed4d2-8c\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Use a proper pickup below a drop-through valve. <\/strong>When feeding a pneumatic line, a pickup shoe or adapter lets material enter the air stream smoothly without blowing back.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_cb7ee7-da .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_cb7ee7-da\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Leave access for service. <\/strong>Space to withdraw the rotor or open the end cover saves hours at every inspection.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_dce8c6-2f .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_dce8c6-2f\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Support the valve properly. <\/strong>Heavy pipework hanging on the flanges can distort the housing and close the rotor clearance.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_4637e2-1b .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_4637e2-1b\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Hazardous area. <\/strong>Whether the dust is combustible and the valve must be explosion-proof or explosion-isolating.<\/span><\/li>\n<\/ul><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Maintenance and Troubleshooting<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A rotary airlock usually tells you it is wearing before it fails. Throughput slowly drops, more air reaches the inlet, and dust appears around the seals. Checking these signs on a schedule is far cheaper than an unplanned stop.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Problem<\/strong><\/th><th><strong>Likely cause<\/strong><\/th><th><strong>What usually fixes it<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Throughput lower than expected<\/td><td>Air leaking up through the inlet, rotor running too fast, poor pocket filling<\/td><td>Vent the leakage air, slow the rotor, check bulk density and clearances<\/td><\/tr><tr><td>Material bridging above the valve<\/td><td>Leakage air fluidizing or packing the product in the inlet<\/td><td>Add a vent line or vent hopper above the inlet<\/td><\/tr><tr><td>Rising air leakage<\/td><td>Worn rotor tips or housing bore<\/td><td>Restore clearance by adjusting or replacing tips, or refurbish the housing<\/td><\/tr><tr><td>Rotor jamming<\/td><td>Lumps, foreign objects or thermal expansion closing the clearance<\/td><td>Screen the feed, add a lump breaker, choose clearances for the operating temperature<\/td><\/tr><tr><td>Dust escaping at the shaft<\/td><td>Worn seals or the wrong seal type for the pressure<\/td><td>Replace seals, or move to air-purged seals<\/td><\/tr><tr><td>Product buildup in pockets<\/td><td>Sticky or hygroscopic powder<\/td><td>Use scalloped pockets, a blow-through design or regular cleaning<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Rotation monitoring is a simple and useful addition. A speed sensor on the shaft confirms the rotor is turning, and stops upstream equipment if it is not, preventing a blocked inlet from backing material up into a collector or silo.<\/p>\n\n\n\n<p class=\"has-link-color wp-elements-0811c37f9a8a838e6872bbca889f99e1 wp-block-paragraph\">In automated plants, the valve\u2019s speed, motor load and rotation signal can feed into the wider control system, linking it with conveyors, silos and packing. How these pieces fit together is covered in the guide to <a href=\"https:\/\/www.cybernetik.com\/blog\/process\/material-handling-automation-systems-in\/\">material handling automation<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Rotary Feeding Valves from Cybernetik<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cybernetik Technologies has been delivering turnkey automation since 1989, with more than 600 employees and over 6,000 projects installed. Its process division designs and builds powder and liquid handling systems for food, pharmaceutical and chemical plants, from bag and bulk bag unloading to storage, conveying, mixing and packing.<\/p>\n\n\n\n<p class=\"has-link-color wp-elements-ab273edfca4d10035c8e6dcbb4e5d8d7 wp-block-paragraph\">For controlled feeding of powders and granules, Cybernetik builds the <a href=\"https:\/\/process.cybernetik.com\/products\/ct-valve.html\">CT Valve<\/a>, a precision metering valve with electric actuation and a multi-blade or butterfly rotor, and the Combo Valve, which uses a butterfly rotor with a central feeder and separate actuators for fine and coarse flow.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Cybernetik CT Valve<\/strong><\/th><th><strong>Specification<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Model code<\/td><td>REFE-CTVA<\/td><\/tr><tr><td>Flow rate<\/td><td>1,000 to 6,000 kg\/hr, with customizable options<\/td><\/tr><tr><td>Inlet and outlet<\/td><td>NB 100 to NB 300<\/td><\/tr><tr><td>Material of construction<\/td><td>SS304 and SS316<\/td><\/tr><tr><td>Rotor options<\/td><td>Multi-blade or butterfly rotor<\/td><\/tr><tr><td>Flow control<\/td><td>Variable frequency drive<\/td><\/tr><tr><td>Sealing<\/td><td>Zero leakage, suitable for vacuum applications<\/td><\/tr><tr><td>Actuation option<\/td><td>Pneumatic, turning the rotor by 90\u00b0 or 180\u00b0<\/td><\/tr><tr><td>Construction<\/td><td>Hygienic GMP design; ATEX construction for flame-proof areas<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_87b829-2d:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_87b829-2d ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_87b829-2d ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_87b829-2d .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3218_87b829-2d ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items3218_87b829-2d ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items3218_87b829-2d ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items3218_87b829-2d ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items3218_87b829-2d kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-3218_cac50c-3b .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_cac50c-3b\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Metered feed up to 6,000 kg\/hr. <\/strong>Variable frequency drive control sets the flow rate to suit the process.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_ac35aa-97 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_ac35aa-97\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Sealed operation. <\/strong>Zero leakage design that also suits vacuum applications.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_38780c-f5 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_38780c-f5\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Fine and coarse feeding. <\/strong>The Combo Valve handles fast filling and accurate topping off in one unit.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3218_d2db89-0e .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3218_d2db89-0e\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Ready for regulated and hazardous areas. <\/strong>Hygienic GMP construction in SS304 or SS316, with ATEX construction for flame-proof areas.<\/span><\/li>\n<\/ul><\/div>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group has-white-color has-text-color has-background has-link-color wp-elements-ac152bf2f15fc4c7252137b9076b5ae4 is-content-justification-space-between is-layout-flex wp-container-core-group-is-layout-bcf883e7 wp-block-group-is-layout-flex\" style=\"border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-left-radius:5px;border-bottom-right-radius:5px;background-color:#12263a;margin-bottom:20px;padding-top:20px;padding-right:30px;padding-bottom:30px;padding-left:30px\">\n<h3 class=\"wp-block-heading has-white-color has-text-color has-link-color wp-elements-f22099acdeda5e510eedec4b07580a36 wp-container-content-29dca9c1\" style=\"font-size:34px;font-style:normal;font-weight:400;line-height:1.4\">Want to know more about our solution?<\/h3>\n\n\n\n<div class=\"wp-block-buttons wp-container-content-69bc4bdf is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-88867f99 wp-block-buttons-is-layout-flex\" style=\"border-style:none;border-width:0px;border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-left-radius:0px;border-bottom-right-radius:0px;margin-top:0;margin-bottom:0;padding-top:6;padding-right:6;padding-bottom:6;padding-left:6\">\n<div class=\"wp-block-button has-custom-width wp-block-button__width-100 is-style-fill\"><a class=\"wp-block-button__link has-white-color has-text-color has-background has-link-color has-text-align-right wp-element-button\" href=\"https:\/\/meetings-eu1.hubspot.com\/anand-gaikar\" style=\"background-color:#ee8d26;padding-top:10px;padding-right:20px;padding-bottom:10px;padding-left:20px\">Book a call<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\"><strong>Frequently asked questions<\/strong><\/h2>\n\n\n<style>.kt-accordion-id3218_d36b04-47 .kt-accordion-inner-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:14px;}.kt-accordion-id3218_d36b04-47 .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid transparent;border-left:0px solid transparent;background:#ffffff;padding-top:var(--global-kb-spacing-md, 2rem);padding-right:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:0px;padding-left:var(--global-kb-spacing-sm, 1.5rem);}.kt-accordion-id3218_d36b04-47 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:0px solid #949494;border-right:0px solid #949494;border-bottom:1px solid #abb8c3;border-left:0px solid #949494;border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;background:#ffffff;font-size:var(--global-kb-font-size-md, 1.25rem);line-height:1.5em;letter-spacing:-0.1px;font-weight:400;text-transform:capitalize;color:#12263a;padding-top:14px;padding-right:10px;padding-bottom:16px;padding-left:16px;}.kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap .kt-blocks-accordion-icon-trigger:before{background:#12263a;}.kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-icon-trigger{background:#12263a;}.kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-icon-trigger:before{background:#ffffff;}.kt-accordion-id3218_d36b04-47 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id3218_d36b04-47 .kt-blocks-accordion-header:focus-visible{color:#12263a;background:#ffffff;border-top-color:#474747;border-top-style:solid;border-right-color:#474747;border-right-style:solid;border-bottom-color:#474747;border-bottom-style:solid;border-left-color:#474747;border-left-style:solid;}.kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( 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body:not(.hide-focus-outline) .kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:after, body:not(.hide-focus-outline) .kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:before{background:#ffffff;}.kt-accordion-id3218_d36b04-47 .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id3218_d36b04-47 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{color:#12263a;background:#ffffff;border-top-color:#abb8c3;border-top-style:solid;border-right-color:#abb8c3;border-right-style:solid;border-bottom-color:#abb8c3;border-bottom-style:solid;border-left-color:#abb8c3;border-left-style:solid;}.kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:before{background:#ff6900;}.kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger{background:#ff6900;}.kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id3218_d36b04-47:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:before{background:#ffffff;}@media all and (max-width: 1024px){.kt-accordion-id3218_d36b04-47 .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid 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.kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id3218_d36b04-47 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{border-top-color:#abb8c3;border-top-style:solid;border-right-color:#abb8c3;border-right-style:solid;border-bottom-color:#abb8c3;border-bottom-style:solid;border-left-color:#abb8c3;border-left-style:solid;}}@media all and (max-width: 767px){.kt-accordion-id3218_d36b04-47 .kt-accordion-inner-wrap{display:block;}.kt-accordion-id3218_d36b04-47 .kt-accordion-inner-wrap .kt-accordion-pane:not(:first-child){margin-top:14px;}.kt-accordion-id3218_d36b04-47 .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid transparent;border-left:0px solid transparent;}.kt-accordion-id3218_d36b04-47 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:0px solid #949494;border-right:0px solid #949494;border-bottom:1px solid #abb8c3;border-left:0px solid #949494;}.kt-accordion-id3218_d36b04-47 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id3218_d36b04-47 .kt-blocks-accordion-header:focus-visible{border-top-color:#474747;border-top-style:solid;border-right-color:#474747;border-right-style:solid;border-bottom-color:#474747;border-bottom-style:solid;border-left-color:#474747;border-left-style:solid;}.kt-accordion-id3218_d36b04-47 .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id3218_d36b04-47 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{border-top-color:#abb8c3;border-top-style:solid;border-right-color:#abb8c3;border-right-style:solid;border-bottom-color:#abb8c3;border-bottom-style:solid;border-left-color:#abb8c3;border-left-style:solid;}}<\/style>\n<div class=\"wp-block-kadence-accordion alignnone\"><div class=\"kt-accordion-wrap kt-accordion-id3218_d36b04-47 kt-accordion-has-19-panes kt-active-pane-0 kt-accordion-block kt-pane-header-alignment-left kt-accodion-icon-style-none kt-accodion-icon-side-right\" style=\"max-width:none\"><div class=\"kt-accordion-inner-wrap\" data-allow-multiple-open=\"false\" data-start-open=\"0\">\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-1 kt-pane3218_e5f592-ee\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">What is the difference between a rotary airlock and a rotary feeder?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">They are often the same machine. The name depends on the main job: an airlock is chosen mainly to hold a pressure difference, while a rotary feeder is chosen mainly to meter material at a controlled rate. Many installations need both at once.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-2 kt-pane3218_c6585b-90\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">How many vanes should a rotary airlock rotor have?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">Most rotors have between six and ten vanes. More vanes put more barriers between inlet and outlet, which improves the seal, while fewer vanes give larger pockets that suit coarse or lumpy material.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-3 kt-pane3218_9cf357-6a\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">Can a rotary airlock handle hot material?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">Yes, if it is designed for the temperature. The rotor and housing expand at different rates, so clearances are set wider for hot service and the bearings and seals are chosen to suit the heat.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-11 kt-pane3218_02b8fa-d0\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">How often should a rotary airlock be inspected?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">It depends on the product and duty. Abrasive materials can wear tips and housings quickly, so frequent checks make sense, while clean food powders may run much longer. Tracking throughput and leakage over time shows when inspection is due.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-18 kt-pane3218_c35daa-fb\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">Is a rotary airlock suitable for combustible dust?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">It can be, but the valve must be built for the hazardous area and, where it forms part of the explosion protection, certified to isolate a flame or pressure wave. The plant\u2019s dust hazard assessment should define what is required.<\/p>\n<\/div><\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n<p class=\"has-white-color has-text-color has-link-color wp-elements-c645e628e62f8fbab9d9726851472d16 wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bulk solids rarely move from one place to another at the same pressure. A silo may sit at atmospheric pressure while the pneumatic line below it runs under pressure&#8230;.<\/p>\n","protected":false},"author":9,"featured_media":2800,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[30],"class_list":["post-3218","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-process","tag-process"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rotary Airlock Valve: Working Principle &amp; Uses | Cybernetik<\/title>\n<meta name=\"description\" content=\"Rotary airlock valve guide: how it works, valve and rotor types, applications in pneumatic conveying, dust collectors and silos, sizing, benefits and upkeep.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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