Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1982-09-21
1984-09-18
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166332, 251324, E21B 3414
Patent
active
044718411
ABSTRACT:
A pressure balanced valve is disclosed which minimizes the force necessary to move the valve between an opened and a closed position even when used to shut off the flow of a high pressure fluid. The valve stem in combination with a pressure relief port on the valve stem balances the pressures acting on the valve to relieve any differential pressure which would tend to maintain the valve either open or closed. In the absence of any differential pressure, the valve stem is not forced in any direction since the resultant of the forces due to the cross-sectional areas of the valve stem is zero, i.e., all of the forces are cancelled. The balancing of the pressure is achieved by a series of passages in the valve body which are selectively interconnected by movement of a valve stem within the body. The invention may be utilized in a down-hole well environment or in above-ground piping systems.
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Bui Thuy M.
El Paso Exploration Company
Novosad Stephen J.
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