Sealing system for downhole well valves
This patent describes a downhole valve for selectively opening and closing fluid flow through a well conduit subject to high-temperature, high-pressure environmental conditions comprising: an annular metallic valve seat assembly mounted conduit; the valve seat assembly defining an annular primary sealing surface on one end face; a secondary seal comprising a ring of nonelastomeric, nonmetallic sealing material; means for mounting the secondary seal ring on the valve seat body in surrounding relation to the primary sealing surface and for limited axial displacement; resilient means urging the secondary seal ring axially to a position where a portion of the secondary seal ring extends axially beyond primary sealing surface; a metallic valve head mounted for movement into sealing engagement with valve seat assembly; the valve head having an annular sealing surface initially contacting the secondary seal ring to establish a seal and axially shift secondary seal ring. This compresses secondary seal ring; the annular sealing surface subsequently engages primary sealing surface to complete the sealing engagement.
- Assignee:
- Baker Oil Tools, Inc., Orange, CA
- Patent Number(s):
- US 4674575
- OSTI ID:
- 6183761
- Country of Publication:
- United States
- Language:
- English
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