This familiy of pump is mainly applied to closed-loop hydraulic servo steering system on motor vehicles, but it can also be applied to other hydraulic system.
These pumps are put into operation by means of drive motor via corresponding coupling, gear, pulley of compressor shaft.
Regarding pump drive, special attention should be paid to the following:
-In case of pulley or gear drive always bear in mind that the capability to withstand radial forces is limited, so it is necessary to consult the manufacturer.
-In case of drive via compressor, transmision of the torque from the compressor shafts should be effected by coupling which allows only for small deviations from axial alignment.
-The pump is allowed to rotate only in specified direction.
-The pump is to be mounted in such a way that its suction line lies below the level of the tank from which working fliud is "sucked in", and suction line is recommended to be as short as possible, the fewer curves the better. The absolute permisible pressure within the suction line should be min.0,85 bar at the tepmerature of 50o C, and the viscosity of 27/mm2/s is not to be exceeded.
-In case the pump without pressure-relief valve is used, the valve is to be provided separately or otherwiese installed within hydralic servo steering gear (there should not be two safety valves within a single hydraulic system).