Parallel expanding gate valve
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Feb 22, 1991
filing date -
Feb 22, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and methods for sealing a parallel expanding gate valve are provided using upper and lower wedges separate from and located between the gate segments. The gate segments are symmetrical with respect to each other and have inner upper and lower tapered surfaces. Inclined surfaces on the upper wedge press the inner upper tapered surfaces of the gate segments. The inner lower tapered surfaces of the gate segments also press against inclined wedging surfaces on the lower wedge. This wedging action forces the gate segments outward with respect to each other and with substantial force against sealing assemblies to close and seal the gate valve.
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