Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1999-01-22
2000-12-05
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 31, 251 58, 251 635, 25112908, F16K 3104, F16K 31124
Patent
active
061555312
ABSTRACT:
A proportional control valve has inlet and outlet solenoids controlling the pressurization and evacuation of a chamber between two pistons in a control valve of the rack and pinion opposed-piston type. The control valve can be maintained in fully open, fully closed, or intermediate positions by selectively energizing and de-energizing the solenoids. The solenoids can be of the normally open or normally closed solenoid poppet types depending on whether the control valve is to open, close or maintain its current state in the event of a power failure.
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Avis Daniel M.
Holborow Peter A.
Automatic Switch Company
Walton George L.
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