Hydraulic screw pump comprises central hole receiving driving screw, suction and discharge orifices and exit hole from drainage conduit to discharge orifice containing non-return valve

摘要

The hydraulic pump has an endless screw in an aluminum body (6). A central longitudinal hole receives the driving screw with a shaft (11). Two holes communicating with the central hole receive the fluid transporting screw (17). Two orifices (3,15) serve as suction and discharge orifices. There is an exit hole (18) from the drainage conduit to the discharge orifice. A non-return valve (16) in the discharge orifice restores the pressure induced by internal leaks in the orifice. There is a hole (14) for the passage of a clamping tool with a plug for sealing the passage to the chamber (9).