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PROBLEM TO BE SOLVED: To improve the pressure control characteristic in a single, swash plate type variable displacement pump so as to stabilize the position control characteristic of an actuator to be controlled. SOLUTION: In a swash plate type variable displacement pump provided with a control val

PROBLEM TO BE SOLVED: To improve the pressure control characteristic in a single, swash plate type variable displacement pump so as to stabilize the position control characteristic of an actuator to be controlled. SOLUTION: In a swash plate type variable displacement pump provided with a control valve 30 for controlling the position of a swash plate so as to supply the discharge oil pressure to an injection cylinder 20 via a flow sensor 11, a decompression drain piping 31 is prepared, which utilizes one port of the control valve 30 as a decompression port so as to connect hydraulic piping between the flow sensor 11 and the injection cylinder 20 with the decompression port. In the pump decompression control, the decompression can be carried out directly from the control valve.

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