Gate valve with internal pressure relief means

Details Gate valve with internal pressure relief means Gate valve with internal pressure relief means

1983-12-27

1985-05-07

Weakley, Harold W.

Fluid handling

Destructible or deformable element controlled

Heat destructible or fusible

137 74, 251167, 251196, F16K 1304

Patent

active

045151741

ABSTRACT:
A valve (10) having an expansible gate assemblage of ported juxtaposed gate and segment members (18, 19) which are movable into sealing engagement with upstream and downstream valve seats (28) about the flow passage (12, 14) in the open and closed conditions of the valve wherein the valve includes pressure relief means which relieves excessive pressure in the valve chamber (11) into the upstream flow passage (12) when the environment in the chamber reaches a preselected temperature with the valve retaining capability of providing an upstream seal in the event of subsequent downstream leakage. The pressure relief means is installed in the segment member (19) of the gate assembly and comprises a passage (43) extending from the port (16) through the segment to the sealing face (25) of the segment member at a location which is exposed to the upstream flow passage (12) in the valve closed condition. The passage (43) includes an enlarged diameter section (44) which is normally plugged by a ball check valve element (42) seated against a shoulder (46) formed in the passage (43) and held thereagainst by a plug (41) of eutectic material and a retainer (47) with an aperture (48) therethrough. The eutectic material is selected to melt at a preselected temperature whereby a pressure build-up in the valve chamber is relieved by unseating the ball check (42) and forcing the molten eutectic material (41) through the apertured retainer (47) into the upstream flow passage (12). In the event of subsequent leakage of the downstream seal to from elsewhere in the valve chamber (11) the upstream line pressure causes the ball check (42) to seat and block the passage (43) such that the valve will again provide an upstream seal.

REFERENCES:
patent: 2171588 (1939-09-01), McGuffey
patent: 2670752 (1954-03-01), Laurent
patent: 4232796 (1980-11-01), Hudson

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