Valves and valve actuation – Lost motion between actuator and valve
Patent
1993-09-03
1995-05-09
Rivell, John
Valves and valve actuation
Lost motion between actuator and valve
251 86, 25112902, F16K 2500, F16K 3102
Patent
active
054133084
ABSTRACT:
A spring biased normally open solenoid actuated valve includes a valve body having a valve seat defining a valve port, located between an inlet port and an outlet port, that is controlled by a spool. When the solenoid is de-energized, the valve spool is biased open by a compression spring. The valve spool may include a double seal assembly expanding the range of operating pressures for a given spring force. The double seal assembly includes a rod having first and second ends with the first end secured to a stem of the spool. A retainer including a first sealing surface is secured to the second end of the rod. A sealing member, longitudinally moveable along the rod, is concentrically located on the rod adjacent the retainer and includes an inner valve seat and a second sealing surface such that the first sealing surface contacts the inner valve seat and the second sealing surface contacts the valve port when the solenoid is energized thus closing the valve. When the solenoid is deactivated intentionally or due to an electrical failure the valve fails to an open position. The valve spool may include a sleeve secured about the rod, positioned adjacent the sealing member so that when the valve stem is moved from a sealing position to an open position, the sleeve contacts the sealing member after movement of the stem has commenced.
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Rivell John
The Horton Company
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