Rotary Airlock Valves are a type of rotary feeder which Simply known as a Rotary Airlock valve or Rotary Valve. They provide feeding and metering functionality of a standard rotary feeder but their primary duty is to maintain pressure and provide an optimal airlock seal between diferent product conveying transitions, such as gravity to pneumatic conveying lines. A best airlock condition is necessary to prevent air pressure loss in high pressure and high temperature conveying systems.