Dump/stop valve for surface controlled subsurface safety valve

Details Dump/stop valve for surface controlled subsurface safety valve Dump/stop valve for surface controlled subsurface safety valve

1997-12-11

1999-10-26

Lee, Kevin

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

251 62, 13762566, F16K 31122

Patent

active

059713534

ABSTRACT:
Dump/stop valve to regulate the time delay between the closure of a surface controlled subsurface safety valve and a surface controlled surface valve. Fluid is applied to a first cavity above a pilot plunger which maintains the subsurface safety valve in an open configuration. In the event the surface safety valve is intended to be closed, the fluid within the first cavity is bled off by a control circuit which immediately closes the surface safety valve. The pilot plunger responds by allowing the subsurface safety valve to be closed a predetermined and consistent time period thereafter.

REFERENCES:
patent: 4307654 (1981-12-01), De Almeida
patent: 4491154 (1985-01-01), Peters
patent: 4597719 (1986-07-01), Tano
"Sigma Enterprises Inc." brochure. 3 page brochure. 1995.

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