Fluid handling – Destructible or deformable element controlled – Destructible element
Patent
1992-03-17
1993-09-14
Schwadron, Martin P.
Fluid handling
Destructible or deformable element controlled
Destructible element
137 681, F16K 1740
Patent
active
052440060
ABSTRACT:
A shut off valve, of the type having a normally open main valve that closes in response to a shear force of greater than a predetermined magnitude, and a normally closed secondary valve that opens in response to a predetermined fluid pressure, wherein the main valve is contained in a first sub-housing and the secondary valve is contained in a separate second sub-housing, downstream from the first sub-housing. A hollow, tubular shear fitting, having an annular shear groove, has an upstream end removably coupled to the downstream end of the first sub-housing, and a downstream end removably coupled to the upstream end of the second sub-housing, where by the first sub-housing, the shear fitting, and the second sub-housing are axially aligned so that they define a continuous internal flow passage from the upstream end of the first sub-housing to the downstream end of the second sub-housing. When the shear fitting fractures at the shear groove in response to a shear force, the fragmented shear fitting can be removed from the sub-housings and replaced, without replacing the sub-housings.
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Lee Kevin L.
Schwadron Martin P.
Universal Valve Company, Inc.
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