In Dome valve closes through timer, and the pneumatic seal inflates against the Dome and at the same instant the vessel is pressurized by high pressure of air, material resistance causes a pressure build-up in the vessel which conveys the complete charge to the storage bunker or silo. When conveying is completed the pressure drops down to near atmospheric pressure and is sensed by the control system, the air supply to the vessel is stopped and the Dome valve opens to accept the next charge of material, on the command from level probe/timer.

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