CHECK VALVE Russian patent published in 2001 - IPC

FIELD: check valves, for example, for compressors in the metallurgical, chemical and other branches of industry, applicable for prevention of return flow. SUBSTANCE: check valve has a body, inlet and outlet connections, shut-off plate that is spring-loaded towards closing and installed for movement in the guide rod of the damper device located inside the body coaxially to it. Made in the ends of the damper device are openings communicating the respective cavities of the damper device with the body cavity, the damper device proper is provided with pipe-lines with valves for alternate disposal of gas (air) from without, the flow areas of the mentioned pipe-lines exceed the flow areas of the mentioned openings of the damper device. EFFECT: enhanced reliability of compressor protection against the return flow of gas due to the use of the check valve with shut-plate installed on the rod of the damper device positioned inside the valve body for reciprocating. 2 cl, 1 dwg