Subsurface safety valve
Patent
·
OSTI ID:5376863
A subsurface safety valve apparatus is described for use in controlling flow in a well conduit providing a desired fluid flow path in the well for the production of well fluids, including: a valve housing having a flow passage formed therethrough which communicates with the well conduit when connected therewith to form a portion of the well conduit at a desired subsurface location in the well; flow closure means disposed in the flow passage for movement to and from a closed position for blocking flow of fluid through the flow passage and an open position for enabling flow of fluid through the flow passage; operator means mounted with the housing for moving the flow closure means longitudinally in the flow passage to and from the open and closed positions, the operator means having an operator sleeve assembly reciprocably disposed in the bore; the operator means having means for urging the flow closure means to the closed position; means for sealing the operator sleeve assembly with the housing to form an expansible chamber therebetween, the operator sleeve assembly having a pressure responsive surface exposed to the fluid pressure in the expansible chamber for moving the operator sleeve assembly for moving the flow closure means to the open position; means for selectively communicating a control fluid pressure into the expansible chamber for moving the flow closure means to the open position when desired; the means for sealing including a first pair of seals and a second pair of seals, each of the pair of seals being pressure energized and facing in opposite directions to prevent leakage into or out of the expansible chamber, and the housing having a longitudinally split guide ring disposed between the first pair of seals and the second pair of seals for preventing extrusion of the first and second pairs of seals by fluid pressure.
- Assignee:
- Hydril Co., Los Angeles, CA
- Patent Number(s):
- US 4603740
- OSTI ID:
- 5376863
- Country of Publication:
- United States
- Language:
- English
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