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U.S. Department of Energy
Office of Scientific and Technical Information

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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