Fluid handling – Destructible or deformable element controlled – Destructible element
Patent
1994-10-28
1995-07-18
Fox, John C.
Fluid handling
Destructible or deformable element controlled
Destructible element
137501, 137549, F16K 3112
Patent
active
054332397
ABSTRACT:
In a fluid flow emergency shutdown valve a valve body is transversely interposed in a fluid line upstream with respect to a flow restricting unit, A valve stem is longitudinally slidably supported by the valve body and referenced to atmosphere at its respective ends, The valve stem supports a valve normally disposed upstream with respect to its seat. The other end portion of the valve stem supports a piston fluid pressure balanced by downstream fluid pressure from the outlet port of the flow restricting unit in combination with the buckling point value of a collapsible pin axially abutting the downstream end of the valve stem, A decrease in downstream fluid pressure below a predetermined value increases the pressure differential across the piston from its upstream to its downstream side which moves the piston to buckle the collapsible pin and move the valve to a closed position.
REFERENCES:
patent: 2881793 (1959-04-01), Lee
patent: 4210171 (1980-07-01), Ributa
patent: 4724857 (1988-02-01), Taylor
patent: 4776365 (1988-10-01), Bathnick et al.
patent: 4922950 (1990-05-01), Taylor
patent: 5080128 (1992-01-01), Taylor
Fox John C.
Rhea Robert K.
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