High temperature subsurface safety valve
This patent describes in a subsurface well safety valve for controlling the fluid flow through a well conduit and including a housing having a bore and a valve closure member moving between open and closed positions for controlling the fluid flow through the bore. A flow tube telescopically moves in the housing for controlling the movement of the valve closure member. Biasing means move the flow tube in a direction to close the valve. The improvement in fluid actuating means for actuating the flow tube comprises: a cylinder in the housing, the cylinder including a ceramic interior; a ceramic piston movable in the ceramic interior of the cylinder in response to fluid acting in the cylinder, the piston engaging and moving the flow tube; and the cylinder on one side of the piston adapted to be in communication with a fluid control passageway, and the cylinder on the second side of the piston adapted to be in communication with a biasing fluid.
- Assignee:
- Camco, Inc., Houston, TX
- Patent Number(s):
- US 4669547
- OSTI ID:
- 6242807
- Country of Publication:
- United States
- Language:
- English
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