FLOW PASSAGE CHANGEOVER AND FLOW RATE CONTROL VALVE

摘要

PURPOSE:To eliminate the provision of an oil pressure pipe between a flow passage changeover valve and a flow rate control valve by incoporating the flow rate control valve of a pressure compensation type in the flow passage changeover valve in compact. CONSTITUTION:A flow passage changeover and flow rate control valve comrises a flow passage changeover valve structure and a flow rate control valve structure; the flow passage changeover valve constituted by a rotor 10 to selectively communicate between ports 2, 3A, 3B and 4; the flow rate control valve structure constituted by a combination of a control piston corresponding to a control piston 33 formed by a control piston 6 and a throttle corresponding to a throttle 34 formed by a pair of throttle parts 12A and 12B. The flow rate control valve is of the pressure compensation type. By this structure, the valve structure becomes very compact and simple, and further the oil pressure pipe between the flow passage changeover valve and flow rate control valve can be eliminated.