Position feedback pilot valve actuator for a spool control valve
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United States of America Patent
Stats
-
Sep 9, 2008
Grant Date -
Jun 22, 2006
app pub date -
Dec 16, 2004
filing date -
Dec 16, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A spool type control valve is operated by an electrically driven pilot valve. A pilot piston is attached to the control spool. As an electrical actuator moves the pilot spool, a greater pressure is applied to one side of the pilot piston than the other side, which causes movement of the control spool. When the control spool reaches the desired position, its positional relationship to the pilot valve defines a pressure differential across the pilot piston which exerts a net force on the control spool that counterbalances a spring force acting on the control spool. This defines an equilibrium position at which the control spool remains until subsequent motion of the pilot spool occurs which alters the pressure differential across the pilot piston.
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