Combined check valve and fluid pressure relief valve

Details Combined check valve and fluid pressure relief valve Combined check valve and fluid pressure relief valve

1990-03-07

1990-08-14

Walton, George L.

Valves and valve actuation

Lost motion between actuator and valve

Check valve with external opening and closing means

137223, 137226, 137523, 137846, 251100, 251339, F16K 1518, F16K 1520

Patent

active

049480928

ABSTRACT:
A combined check valve and relief valve assembly for permitting the free of a fluid in a first direction and for selectively preventing backflow. Backflow occurs only upon depression of a compression spring-loaded cylindrical valve actuator housed within the valve body. The valve assembly comprises a valve body having an inlet and outlet port which are adjacent to an upper and lower cylindrical bore respectively, thus providing a flow path. A resilient duckbill valve is mounted within the cylindrical bores. A compression spring-loaded valve actuator is also received, lossely, within the valve body and is provided with a stem at the end of the valve actuator, proximate to the opening of the duckbill valve. Fluid passing through the upper cylindrical core around the valve actuator opens the lips of the duckbill valve permitting free passage therethrough. Back pressure seals the lips of the duckbill valve so that the valve becomes a check valve. Depression of the valve actuator, however, causes the stem thereof to penetrate and open the valve lips to selectively permit backflow to provide the relief valve function.

REFERENCES:
patent: 1182375 (1916-05-01), Hutson
patent: 2069105 (1937-01-01), Engle
patent: 3312213 (1967-04-01), Timm
patent: 3351081 (1967-11-01), Bogossian et al.
patent: 3536117 (1970-10-01), Huber
patent: 3901272 (1975-08-01), Banners et al.
patent: 4060184 (1977-11-01), O'Neil, Sr.
patent: 4062377 (1977-12-01), Ward
patent: 4176681 (1979-12-01), Mackal
patent: 4535818 (1985-08-01), Duncan et al.
patent: 4549573 (1985-10-01), Breckenridge

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