A pressure control valve assembly includes a valve housing having a spring loaded, resilient valve element with reversely curved conical surfaces thereon one of which is seated on a fixed, annular pressure relief seat by a first spring element and the other of which is seated against a spring biased ball check valve that controls flow through a central opening in the valve element defining a vacuum relief path.
A pressure vacuum relief gas cap including a closure for sealing between a first source of pressure and a second source of pressure, a valve housing on said closure having a bore therethrough, wall means in said housing including a fixed valve seat forming an opening between said first and second sources of pressure, a seal element having an apex and a skirt of conical configuration, means including a movable carrier connected to said apex and a compression spring located coaxially of said seal element and against said carrier for supporting said skirt c...
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