PISTON PUMP WITH GAS INTAKE SUCTION VALVE Russian patent published in 2015 - IPC F04B19/06 F04B47/00 

FIELD: machine building.

SUBSTANCE: claimed pump comprises the housing accommodating the piston to make the working chamber, suction and delivery valves each provided with gate and seat for alternating communication between working chamber and suction and delivery pipes, and gas discharge means. Suction pipe can communicate with fluid tank. Suction valve seat is located at working chamber dead space top part. Gas discharge means are made in suction valve as shunting micro channels. The latter communicate working chamber with suction pipe with total flow section of micro channels making 0.01-0.2% of suction valve seat area related to its ID.

EFFECT: compact and simple design, high reliability.

8 cl, 5 dwg