초록 ▼

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 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.

대표청구항 ▼

A combined check valve and fluid pressure relief valve assembly comprising: a valve body having a passage therethrough; said valve body being constructed of a molded piece of substantially rigid material; said valve body having a first cylindrical bore extending from an inlet port opening of the val

A combined check valve and fluid pressure relief valve assembly comprising: a valve body having a passage therethrough; said valve body being constructed of a molded piece of substantially rigid material; said valve body having a first cylindrical bore extending from an inlet port opening of the valve to a second cylindrical bore and the second cylindrical bore extending to an outlet port opening of the valve; said second bore having a cross-sectional area less than said first bore; said valve body having a substantially “J”-shaped groove extending from said inlet port opening; a duckbill valve, molded from a single piece of resilient material in a generally cylindrical hollow shape, having a pair of lips disposed in a converging relationship and adjacent to each other, side walls interconnecting the lips and defining an open end facing said inlet port, and an outwardly extending flange located around said open end; a cylindrical relief valve actuator loosely mounted within said valve body, said actuator having a substantially wide diameter outer end extending outwardly from said valve body for actuation by a user\s finger; said valve actuator tapering downward to form a stem, with a reduced diameter at the end of said valve actuator in an axial direction, passing through a coil compression spring member and extending proximate to the lips of said duckbill valve, and including a guide and retention knob member on said actuator interfitting with different sections of said “J”-shaped groove for assembling and securing said valve actuator within said valve body; said compression coil spring member mounted between said actuator and said duckbill valve within said valve body and biasing said actuator away from said duckbill valve, with said retention knob member in said “J”-shaped groove guiding said actuator; said valve assembly including means for opening said duckbill valve by the end of said actuator when said actuator is depressed by a user\s finger to permit fluid to escape past said actuator; and pressurizing means being removably mounted to said valve body and extending over the inlet port, said J-shaped groove and said knob, for applying fluid pressure to said inlet port around said actuator and opening the lips of said duckbill valve for fluid flow from said pressurizing means through said duckbill valve without actuating said valve.