Valve assembly
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United States of America Patent
Stats
-
Apr 12, 1988
Grant Date -
N/A
app pub date -
Nov 17, 1986
filing date -
Nov 17, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve assembly is provided which includes a seat structure and a cage structure. A valve member is movable between open and closed positions and includes an upstream side adapted to engage the seat structure with the valve member in its closed position and a downstream side connected to the cage struture. The cage structure includes a manifold communicating with the valve member downstream side. A pilot valve is provided for selectively venting the manifold to an area of low fluid pressure whereby the valve member is held in its open position.
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