All AV pumps and dense phase pump systems use dome valves as feed valves. Within the set feeding time, the dome valve opens and the pressure tank is filled with material. Once the material is full, the dome valve closes and seals; The conveying medium enters the pressure tank, usually compressed air. The temporary resistance caused by the material transports the material to the target silo. During the transportation of materials along the pipeline, the air pressure gradually decreases. When the material reaches the target silo, the air pressure drops to near atmospheric pressure, which will be detected by the control system. Then the pressure tank stops air intake, the dome valve opens, and the pressure tank is refilled. If the AV pump and dense phase pump stop continuous cyclic operation, the dome valve will remain closed and there will be no material in the pressure vessel.