SHUTOFF VALVE Russian patent published in 2020 - IPC F16K17/04 F02C7/22 

FIELD: aviation.

SUBSTANCE: present invention relates to aircraft engineering, namely to shut-off valves regulating fuel production from aircraft tanks. Shut-off valve comprises a housing having a nozzle of input command pressure, an inlet pressure control nozzle and a drain pipe. Inside the housing there installed is a spring-loaded piston with a pusher, a spring-loaded drain valve, which is made with possibility of interaction with the pusher, in the valve body on the side of the command pressure nozzle before the piston with the pusher the rising pressure chamber is formed, and on the side of the control pressure connection upstream of the drain valve there is a decreasing pressure cavity. Between the piston with the pusher and the drain valve inside the body there is a cavity connected to the drain pipe, wherein annular bore is made on piston outer side to accommodate annular sealing element to make friction pair with cut-off valve body.

EFFECT: invention allows preventing seizure of piston in valve body and improving reliability of aircraft fuel system.

4 cl, 1 dwg