Self closing equalizing valve for a subsurface well safety valve

Patent · Tue Feb 02 00:00:00 EST 1988

OSTI ID:5287981

Pringle, R E

A subsurface well safety valve for controlling the fluid flow through a well conduit is described comprising, a housing having a bore and a first valve closure member in the bore moving between open and closed positions for controlling fluid flow through the bore, a tubular member telescopically movable in the housing for controlling the movement of the first valve closure member, biasing means for moving the tubular member in a direction to close the valve, a first piston and cylinder assembly in the housing contacting and moving the tubular member, a fluid control passageway positioned in the housing in communication with the first piston and cylinder assembly and adapted to be in communication with fluid pressure at the well surface, a valve seat and valve element positioned in the fluid control passageway and positioned to shut off flow from the fluid passageway to the first piston and cylinder assembly when the first valve closure member is opened, an equalizing line in communication with the bore of the housing between points below and above the first valve closure member, an equalizing valve in the equalizing line, a second piston and cylinder assembly in the housing connected to the equalizing valve, the second piston and cylinder assembly being in fluid communication with the fluid control passageway through a fluid communication line downstream of the valve seat and element for opening the equalizing valve prior to the opening of the first valve, second biasing means for moving the equalizing valve to a closed position, and a fluid bypass for bypassing the second piston and cylinder assembly for bleeding off opening pressure to the equalizing valve after the valve seat has seated on the valve element to allow the second biasing means to close the equalizing valve.

• Assignee: Camco, Inc., Houston, TX
• Patent Number(s): US 4722399
• OSTI ID: 5287981
• Resource Relation: Patent File Date: Filed date 12 Mar 1987
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
RELIEF VALVES
DESIGN
CYLINDERS
HYDRAULICS
NATURAL GAS WELLS
OFFSHORE PLATFORMS
OIL WELLS
OPERATION
PISTONS
CONTROL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUID MECHANICS
MECHANICS
VALVES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing