Valve control system
OwnerRonald F. Howarth, Domenico Ciolfittoinventors
Life of this patent
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Abstract
A control system particularly for use for saw mill machinery utilizing large pneumatic actuators. A joystick provides an electrical control signal to a hydraulic proportional pilot valve which, in turn, hydraulically controls a valve body which controls the flow of air to the pneumatic actuator.
Claims5
A control valve comprising a hydraulic proportional electrically operated pilot valve operably connected to a main air valve, hydraulic fluid inlet and outlet ports in said pilot valve, a first set of said ports running to a hydraulic fluid reservoir and a hydraulic pump operable to provide hydraulic fluid from said reservoir under pressure to said pilot valve, a second set of said ports being connected and providing hydraulic fluid to said main air valve, said main air valve having a first set of ports running to said pilot valve, said main air valve further including a spool, centering springs to hold said spool in a neutral position, said spool being movable by said hydraulic fluid provided from said second set of ports of said pilot valve and an air supply operably connected to said main air valve for discharge from said air valve to a pneumatic cylinder, said air supply being discharged from said air valve and provided to said pneumatic cylinder being determined by the movement of said spool in said air valve from said neutral position.
Dependencies are inferred from the claim text.