Flapper valve
Patent
·
OSTI ID:6777260
A subsurface valve for use in a well having a hinged flapper closure element and a moveable fluid pressure actuated operator element and a resilient member connecting the operator element to the closure element.
- Assignee:
- Otis Engineering Corp
- Patent Number(s):
- US 4216830
- OSTI ID:
- 6777260
- Country of Publication:
- United States
- Language:
- English
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