Flow loading unloader valve
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United States of America Patent
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-
Oct 20, 1992
Grant Date -
N/A
app pub date -
Oct 24, 1990
filing date -
Oct 24, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A flow loading unloader valve wherein the operating force for moving the valve from the unloaded condition to the loaded condition is supplied by the flow through the valve itself. The valve, which may be interposed between a fluid supply and a high pressure load, comprises a valve body, having an inlet, a working outlet, a bypass outlet, and a valve operator, which may include a spool, that controls the direction of flow through the body. Movement of the valve operator to change the valve from the unloaded condition to the loaded condition is accomplished by applying the differential pressure created by the flow of fluid from the inlet to the bypass outlet to the piston ends. As the pressure increases as a result of increased flow resistance through the valve, the valve operator moves from an unloaded to a loaded position, terminating flow to the bypass port and resulting in high pressure flow to the working outlet.
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