Importance

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Abstract

There is disclosed a pressure relief valve having an inlet to the interior thereof which comprises a passageway including an annular sealing member of resilient sealing material which has a sealing lip about its inner diameter adjacent its outer end, and a valve element slidably reciprocable within the sealing member between a closed position in which its one end extends through and beyond the lip of the sealing member, so as to contain fluid from a source to which the inlet is connected, and an open position in which its lower end is removed from within the sleeve so as to permit said fluid from the inlet to be exhausted through an outlet or vent port from the interior of the valve. A stem on the valve element is guidably reciprocable within the valve body, and a spring surrounding the stem is contained at one end by the body and at the other end by a detent means which provides a connection between the stem and spring to maintain the spring in a compressed position and thereby oppose opening movement of the valve element due to control fluid acting on the valve element within the sealing member. The connection of the detent means to the stem is releasable, upon movement of the valve element toward its open position, but prior to withdrawal of its end from the lip of the sealing member, whereby further opening movement of the valving element is unopposed by the spring, and the detent means has means for automatically reconnecting the stem to the sleeve upon movement of the stem in a direction to returned the valve element to closed position.

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First Claim