ELEKTROHYDRAULISCHE STEUERVORRICHTUNG ZUR STEUERUNG EINER HYDRAULISCHEN VORRICHTUNG MIT HYDRAULISCHEN SCHIEBERN, INSBESONDERE RICHTUNGSSTEUERVENTILEN, UND ZUM STEUERN EINES DRUCKAUFBAUVENTILS DER HYDRAULISCHEN VORRICHTUNG

摘要

A joystick controller 10 for remotely controlling hydraulic directional control valve 82 and also for controlling a solenoid actuated pressure build-up valve 90 is disclosed. A light-emitting diode 19 is carried in and by a handle 13 of the joystick controller 10. A photosensitive transistor 31 receives the light emitted from the light-emitting diode 19. When the handle 13 moves off of a neutral position, a receptacle 28 blocks the light from the photo-transistor 31. In one embodiment, a fiber optic light conductor 20 extends from the light-emitting diode 19 toward the photo-transistor 31. The photo-transistor 31 then actuates a relay switch which sends a control signal to a solenoid actuated pressure build-up valve 90, thereby providing a ready means for effectuating both the control of the hydraulic directional control valve 82 and the pressure build-up valve solenoid 90 with one controller 10.