Pilot operated valve
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United States of America Patent
Stats
-
Jun 2, 1987
Grant Date -
N/A
app pub date -
May 13, 1985
filing date -
May 13, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To minimize friction losses and hysteresis losses while providing convenient adjustability without alignment problems in a pilot operated valve, a poppet is disposed between two ports in a valve body and is biased by means of a spaced diaphragm assembly. The poppet is axially positionable in the body in a nearly zero lapped position relative to the first and second ports. In cooperation with the diaphragm assembly, fluid pressure signals delivered to three separate chambers are utilized to control valve opening ramp rate, pressure variations within the limit of a set point, and adjustability of the set point.
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