A rotary valve is a valve without a home, at least until you determine the application and accessories, which can make it either an airlock, feeder, or both. The following explains the different ways a rotary valve can be used…

Rotary Airlock

An Airlock is a valve that separates a pressure differential by sealing off airflow from a hopper, bin, or conveyor. In the pneumatic conveying world, Airlocks are usually found at the beginning of a pressure system or at the end of a vacuum system. Other components that may be considered airlocks are knife gates, butterfly valves, double dump valves, venturis, OR rotary valves. Once the rotary valve begins to turn, it becomes a rotary airlock that separates a pressure differential while material is passing through it.

Rotary Feeder

A Feeder is a valve or device that’s main purpose is metering material into or out of something but is not separating a pressure differential. These can be volumetric feeders, vibratory feeders, screw conveyors, OR a Rotary Feeder.

Rotary Airlock Feeder

A Rotary Airlock Feeder does BOTH, it separates a pressure differential while allowing material to pass through. Imagine a revolving door into a building; it allows material (people) to pass through while maintaining the pressure differential between the building and outside. Rotary airlock feeders are designed to leak air and sacrifice accuracy of metering, BUT… function as both an Airlock and a Feeder simultaneously.

Have Questions About Rotary Valves, Rotary Airlocks, Rotary Feeders, or Rotary Airlock Feeders?

For questions on sizing or features of your Rotary Valves, contact Palmer Tool today. Palmer has experience building NEW valves and REPAIRING old valves that many shops are unable (or unwilling) to repair. Palmer’s Severe Duty Rotary Valve has PROVEN to last 3X longer than competitor’s valves, and Palmer can REBUILD and/or UPGRADE your existing valve with hard facing alloys, heavy-duty bearings, and improved seals. For more information, visit and read more about your options for Rotary Valves and how Palmer’s Hard Facing works.

Contact us (731-584-4681) to start a no-obligation discussion about your rotary valves.

About Palmer Tool

Palmer Tool completes critical jobs on-time and on-budget. Since 1966, Palmer has taken on jobs that other shops and contractors either didn’t want, or just couldn’t do. We can fabricate parts in our shops, visit you at your plant, or meet you at on-location (ie. logging, mining, construction, etc.). From the toughest repairs to the most complex new assembly, we’ve seen and done it all. Over the past 50+ years, Palmer has maintained our reputation as a trusted expert welder and fabricator of non-ferrous alloys in demanding applications (high pressure + high temperature chemical plants). Our hard-facing applications, and robust designs, have successfully extended the service life of countless industrial “extreme service” components, saving our clients money! Palmer Tool and Contractors provide on-call emergency services 24/7, because we understand that in manufacturing “the clock never stops”.