Rotary air lock

While airtight, rotary airlock feeders are built with precision tolerances to limit air loss in pneumatic circuits. In a sense, a rotary valve that works as both an airlock and feeder is like a revolving door, allowing the material to pass through it while maintaining air pressure within the building.An airlock, air-lock or air lock, often abbreviated to just lock, is a compartment with doors which can be sealed against pressure, which permits the passage of people and objects between environments of differing pressure or atmospheric composition while minimizing the mixing of environments and the change of pressure