Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1980-06-06
1982-09-14
Cline, William R.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
137517, 166319, F16K 1704
Patent
active
043490433
ABSTRACT:
An apparatus and method are provided in which the apparatus is insertable along a pressure transmission conduit extending from a source point to a pressure responsive device, such as a safety valve in a subterranean well. The apparatus has a fluid passageway through a housing with inlet and outlet means for communicating the passageway to the transmission conduit. A frictionless ball valve head and seat means are disposed in the housing and across the passageway for selectively isolating pressure communication between members of the transmission conduit. Means, such as a plunger, are provided for shifting the ball valve head off of its seat, with piston means being carried by the plunger and including a piston head which is responsive to differential pressure for urging the plunger in a first direction to move the ball valve to its seat upon increase of pressure in the conduit above a predetermined value. Biasing means shift the ball valve away from its seat when pressure within the transmission conduit does not exceed a predetermined value, for normal operation of the pressure responsive device.
REFERENCES:
patent: 1003916 (1911-09-01), Koenig
patent: 1832863 (1931-11-01), Hewitt
patent: 2219736 (1940-10-01), Bryant
patent: 2541282 (1951-02-01), Powers
patent: 2704551 (1955-03-01), Ralston
patent: 3543793 (1970-12-01), Dollison
patent: 4087986 (1978-05-01), Grahl
Baker CAC, Inc.
Cline William R.
Norvell, Jr. William C.
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