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A subsurface well safety valve having a housing with a valve closure member which is controlled by a flow tube which includes an improved hydraulic actuating mechanism. The housing includes a cylinder with a straight portion and a curved portion which is adapted to receive hydraulic fluid from the s

A subsurface well safety valve having a housing with a valve closure member which is controlled by a flow tube which includes an improved hydraulic actuating mechanism. The housing includes a cylinder with a straight portion and a curved portion which is adapted to receive hydraulic fluid from the surface and a piston is movable in the cylinder and connected to the flow tube for moving the flow tube to an open position. The piston includes a metal seal and a flexible portion connected to the top of the metal seal and the flexible portion is adapted to move through the curved portion of the cylinder. A valve and a valve seat are provided in the cylinder above the piston for sealing the hydraulic fluid from the well surface when the valve is open and for engaging and holding the flexible portion and the piston in the open position.

대표청구항 ▼

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 in the bore moving between open and closed positions, a flow tube telescopically movable in the housing for controlling the movement of the valve c

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 in the bore moving between open and closed positions, a flow tube telescopically movable in the housing for controlling the movement of the valve closure member, means for biasing the flow tube in a direction for allowing the valve closure member to move to the closed position, the improvement in means for moving the flow tube in a direction for opening the valve closure member comprising, said housing having a cylinder including a straight and a non-straight portion and a port in communication with the cylinder and adapted to receive hydraulic fluid from the well surface, said non-straight portion being positioned above the straight portion, a piston movable in the cylinder and contacting the flow tube, one side of the piston being in communication with the port for being exposed to hydraulic fluid for moving the flow tube in a direction to open the valve closure member, said piston including a flexible portion and a straight portion, said flexible portion positioned above the straight portion for moving through the non-straight portion of the cylinder, and a valve element and valve seat in the cylinder between the port and said one side of the piston for holding the piston in the open position.