DIRECTIONAL SWITCHING VALVE DEVICE WITH PRESSURE COMPENSATION

PROBLEM TO BE SOLVED: To provide a before-orifice type valve with pressure compensation small-sized and capable of serving as a high leakage preventing function by using a poppet valve constituting this valve with pressure compensation and providing a function as a load check valve therefor. SOLUTION: This control valve device with pressure compensation is provided with a main valve 20 consisting of a poppet valve body for communicating and cutting off communication with inflow and outflow ports 201, 202 of the valve with pressure compensation 7, a back pressure chamber 70, and first and second pilot valves 30, 40 for operating the main valve 20 by controlling pressure oil flowing from the inflow port 201, the back pressure chamber 70 to the outflow port 202 so as to change fluid pressure in the back pressure chamber 70. Upstream and downstream pressures of a meter-in variable restriction 63a are allowed to work on the pressure receiving parts 46, 48 of the second pilot valve 40. The main valve 20 is retained at a cut-off position by leading load pressure to the back pressure chamber 70 when discharge pressure of a pump is lower than load pressure of the actuator 6, and the pressure of the back pressure chamber 70 is decreased so as to open the main valve 20 when the discharge pressure of the pump is higher than the load pressure. Accordingly, differential pressure before/after the meter-in variable restriction 63a is controlled.