Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1996-01-16
1999-05-25
Lee, Kevin
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137488, 166375, 166321, 166324, F16K 31363
Patent
active
059062207
ABSTRACT:
A control system for the operation of the subsurface safety valve is disclosed. The control system uses a pressurized gas chamber, as well as a shuttle valve which connects to the main fluid pressure supply from the surface. The shuttle valve is connected to the gaseous chamber as well as to a barrier piston. As a result of the arrangement, leakages between the downstream side of the operating piston and the shuttle valve result in a reestablishment of the pressure balance on the operating system which allows the subsurface safety valve to close. Additionally, in the event of loss of gaseous pressure, the same pressure-balancing effect occurs on the operating piston, which allows the subsurface safety valve to go to a closed position. The configuration of the control system, which includes a gaseous chamber, allows for disconnection of the hydraulic fluid supply before the predetermined depth is reached to facilitate the connection of a tubing hanger.
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Camco Catalog, TRC Series Pressure Charged Safety Valves, 1992-1993, pp. 48-49.
Baker Hughes Incorporated
Lee Kevin
LandOfFree
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