KOMPAKTE, WIDERSTANDSGEREGELTE MEHRFACHAUSGANGS- HYDRAULIKEINHEIT UND ABDICHTVENTIL

摘要

A hydraulic tool (10) includes housing structure (16), a pump piston (20) disposed in the housing structure (16) to define a pumping chamber (D) at one end thereof and a pump reservoir chamber (E) at another end of the pump piston. The pump piston (20) moves within the housing structure (16) to develop pressure on fluid in the pumping chamber (D). A ram piston (18) is disposed in the housing structure (16) to define a drive chamber (C). The ram piston (18) has a front surface and an opposing rear surface. An accumulator (30) is in selective communication with the rear surface of the ram piston (18). Valve structure (36) is constructed and arranged to selectively communicate the drive chamber (C) with the pump reservoir chamber (E) and with the accumulator (30) thereby initiating movement of the ram piston (18) in a direction opposite the certain direction.