Well subsurface safety valve
A well subsurface safety valve is described which consists of: a housing having a bore, a flapper valve closure member in the bore moving between open and closed positions, a tubular member telescopically movable in the housing for controlling the movement of the valve closure member, means for moving the tubular member downwardly for opening the valve closure member, biasing means contacting the tubular member for moving the tubular member upwardly for allowing the valve member to close, coacting engaging shoulders on the tubular member and the housing spaced from the lower end for limiting downward movement of the lower end of the tubular member, a movable resilient and non-metallic seal means telescoping movable in the housing and positioned in the path of travel of the lower end of the tubular member, stop means between the housing and the seal means limiting the extent of travel of the seal means in the upper and lower directions, and spring means between the housing and the movable seal means for urging the seal means toward the tubular member for sealing against the lower end of the tubular member when the valve is in the open position.
- Assignee:
- Camco, Inc., Houston, TX
- Patent Number(s):
- US 4597445
- OSTI ID:
- 5560428
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CLOSURES
CONTROL EQUIPMENT
ELEMENTS
EQUIPMENT
FLOW REGULATORS
NATURAL GAS WELLS
NONMETALS
OIL WELLS
POSITIONING
RELIEF VALVES
SEALS
SPACE DEPENDENCE
TUBES
VALVES
WELLS