Combined check valve and fluid pressure relief valve

A combined check valve and push-button pressure relief valve assembly comprising:

• a housing having an external surface and an internal bore extending through the housing, said housing having an inlet and an outlet;
• a duckbill valve mounted in said bore;
• push-button actuator means loosely mounted in said housing having a first position in which it extends outwardly away from said duckbill valve from said inlet side of said duckbill valve and a second position in which it opens said duckbill valve from the inlet side thereof, said actuator having a substantially wide diameter outer end extending outwardly from said valve body for actuation by a user's finger;
• means for normally biasing said actuator means to said first position in which it does not open said duckbill valve;
• said valve assembly including stop means for preventing movement of said actuator means by said biasing means beyond said first position;
• pump means having an outlet means for making a tight fit over the external surface of the inlet to said housing and over said actuator, for applying air through said valve assembly by opening the lips of said duckbill valve assembly by the application of air pressure thereto without actuating said push button actuator means;
• and
• 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.

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;
• 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;
• a cylindrical push-button relief valve actuator loosely mounted within said valve body and extending out said inlet port, said actuator having a substantially wide diameter outer end extending outwardly by a predetermined distance 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, proximate to the lips of said duckbill valve;
• means for resiliently biasing said actuator away from said duckbill valve;
• said valve assembly including stop means for preventing movement of said actuator by said biasing means beyond the point where said actuator extends outwardly from said valve body by said predetermined distance;
• pressurizing means for applying a fluid through said cylindrical bores of the valve body, around said actuator, thereby opening said lips of said duckbill valve and allowing the passage of a fluid therethrough without actuating said push button actuator;
• and
• 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.