Equalizing means for a subsurface well safety valve
This patent describes a subsurface well safety valve for controlling the fluid flow through a well conduit. It comprises: a housing having a bore and a valve closure member in the trolling fluid flow through the bore, a flow tube telescopically movable in the housing for controlling the movement of the valve closure member, a piston and a cylinder assembly in the housing contacting and moving the flow tube, spring biasing means in the housing for moving the flow tube in a direction to close the valve, a fluid control port positioned in the housing in communication with the piston and cylinder assembly and adapted to be in communication with fluid pressure at the well surface, an equalizing line in communication with the bore of the housing between points below and above the value closure member, an equalizing valve in the equalizing valve in the equalizing line, and the equalizing line includes a passageway through the interior of the spring biasing means.
- Assignee:
- Camco International Inc., Houston, TX (United States)
- Patent Number(s):
- A; US 5058682
- Application Number:
- PPN: US 7-754982
- OSTI ID:
- 5497938
- Country of Publication:
- United States
- Language:
- English
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