FIELD: pressure boosting device.
SUBSTANCE: invention relates to pressure boosting device (10) has drive cylinders (14, 16) located on both sides of the boost cylinder (12) and is equipped with a pair of pilot valves (72, 74) that are actuated when the pistons (36, 38) the actuator cylinders are in contact with the pilot valve (72, 74) at the ends of the piston travel portions; and a pair of operating valves (48, 52) that switch the state of supplying pressurized fluid to the pressure chambers (24a, 26a) of the actuating cylinders. When the pilot valves are actuated, pressurized fluid flows through the pilot valves and is supplied to a pair of service valves, and the pressurized fluid supply state is switched.
EFFECT: provides ability to perform switching operations of pilot and service valves without electrical means.
14 cl, 12 dwg
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