PISTON PUMP/ -MOTOR

摘要

A plunger pump / plunger motor comprises a block (1) accommodating a first cylindrical chamber (7) and a plunger (2) movable in this chamber and a drive shaft (19) connected to this plunger (2), as well as a second cylindrical chamber (7B) and a control valve (3) movable in this second cylindrical chamber. Holes O3 and O4 can alternately be brought into communication with the connection (6) for the delivery pipe by the plunger (2) and with a connecting hole (5) for a pressure line. The control valve (3) can establish a communication between the hole O2 and the connecting hole (5). The drive shaft (19) is connected to a further plunger (2a) which is movable in a third cylindrical chamber (8) in which there is a suction hole / delivery hole (9). The control valve (3) can alternately establish a communication between the suction hole / delivery hole (9) with a connecting hole (4) for a suction pipe and the connecting hole (5) for the pressure line. In this manner a simple plunger pump / plunger motor is obtained.