Electrohydraulic directional control valve

摘要

Electrohydraulic directional control valve with a hydraulically controlled main control valve (12), the four controlled terminals and a displaceable in three switching positions main control slide valve (38) which, as a result of the force of springs (41, 42) in a neutral position and centered by the action of pressure chambers (37, 39) to both sides with control pressure can be deflected,with an electrically controlled pilot valve (10), the four controlled terminals in at least three switching positions and a movable pilot slide (14) extending from a proportionally - electromagnet (15) against a restoring spring (14b) is operable,and with a shut-off valve (11), which is a of an electromagnet (25) operable control member (21), with which a pressure chamber (37) of the main control valve (12) with a terminal of the pilot valve (10) can be relieved of the control pressure can be connected and,characterised in that the shut-off valve (11) a second control member (22), with which the other pressure chamber (39) of the main control valve (12) with a different terminal of the pilot valve (10) and of the control pressure can be connected can be relieved and..