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In a safety valve having an axially shiftable actuating sleeve operable to move a valve head from a closed to an open position, the actuating movement of the actuating sleeve is normally produced by a small diameter piston mounted on an axially extending spindle secured to the valve housing and coop

In a safety valve having an axially shiftable actuating sleeve operable to move a valve head from a closed to an open position, the actuating movement of the actuating sleeve is normally produced by a small diameter piston mounted on an axially extending spindle secured to the valve housing and cooperating with a primary cylinder which is abuttingly secured to the actuating sleeve. A secondary spindle and cooperating cylinder are provided which are supplied with fluid pressure by an entirely separate line extending to the well surface. The second cylinder has only abutting contact with the actuating sleeve and may be utilized to effect the movement of the actuating sleeve in the event of the failure of the primary cylinder. In a modification, a fixed cylinder housing defines a pair of secondary cylinder bores in which secondary rod pistons are slidably mounted to effect the movement of the actuating sleeve. In both modifications, collet latches prevent return movement of the secondary cylinder or secondary rod pistons, thus locking the valve head in an open position.

대표청구항 ▼

In a valve for controlling the flow in a fluid transmission conduit in a subteranean well comprising a tubular valve housing defining an axial fluid passage, a valve closure member shiftably mounted in said valve housing for movement between an open and closed position relative to said fluid passage

In a valve for controlling the flow in a fluid transmission conduit in a subteranean well comprising a tubular valve housing defining an axial fluid passage, a valve closure member shiftably mounted in said valve housing for movement between an open and closed position relative to said fluid passage, resilient means biasing said valve closure member to said closed position, a valve-actuator sleeve concentrically mounted within said tubular valve housing for axial movements between two positions relative to said valve closure member, in one of said positions holding said valve closure member in said open position and in the other of said two positions permitting said valve closure member to close, and fluid pressure operated means for axially shifting said valve-actuator sleeve to said one position; the improvement comprising: a spindle attached at one end to said housing and disposed in an axially extending position intermediate said valve-actuator sleeve and the axial fluid passage of said tubular housing; means on the other end of said spindle defining a piston; an axially elongated cylinder having a bore slidably and sealably cooperating with said piston and a closed end defining a fluid pressure chamber adjacent said other end of said spindle, said cylinder having a plurality of peripherally spaced ports therein disposed adjacent said one end of said spindle; means for supplying pressured fluid to said fluid pressure chamber, thereby shifting said cylinder axially to abuttingly engage and shift said valve-actuator sleeve to its said one position; and latching means including a collet having a ring portion mounted on the exterior of said cylinder and latching heads projecting through said parts through said cylinder to engage a latching shoulder of said spindle adjacent said position, said latching means being operable between said cylinder and said spindle to secure said valve-actuator sleeve in said one position, thereby locking said valve closure member in its said open position.