Pilot operated valve
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United States of America Patent
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Dec 12, 2006
Grant Date -
Apr 28, 2005
app pub date -
Apr 12, 2004
filing date -
Oct 10, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A valve assembly having a fluid switch and a main valve for controlling fluid pressure in a working volume in three control states wherein the main valve has three ports for fluid, flow of fluid through a first port and a second port being controlled by the fluid switch being provided with an electrical signal in a first state or a second state respectively, and flow of fluid through the third port being controlled by alternating the signal, preferably rapidly, between the first and second states.
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