HOF Fixed Displacement Single Vane Pump

HOF Fixed Displacement Single Vane Pump

Features:

HV / HVQ Series are fixed displacement and balanced type vane pumps. Available in both 12 vanes design for industrial application with quiet operating and 10 vanes design for mobile application with higher pressure and wider range of speed.

The vane design with self compensation for wear and clearances makes volumetric efficiency of pump nearly constant over the service life. (The vane always adjusts its orbit to contact with the cam ring, even though wear occurs between the cam ring and vane tip.)

With a balanced intra-vane design, outlet pressure is continuously applied only to the area between the vane and insert. This area is small and thrust is correspondingly light. Top and bottom areas of the vane are subject to either inlet or outlet pressure, depending on the vane's location during rotor rotation. The valving of pressure to and from the bottom area of the vane is through holes drilled in the rotor. This varying pressure under the vane reduces wear and increases pump efficiency.

The vane pump is not damaged at low speed and high pressure operation because pumping action does not start until the speed is high enough for the vane to throw out.

The inlet or outlet ports can be rotated through increments of 90° in relation to each other, providing application flexibility and easy installation. With the cartridge independent of the shaft, allowing for easy change of flow capacity and field servicing without removing the pump from its mounting.

For the cartridge kit of HVQ Series, the flexible plates are inserted between the support plates and the rotor. The flexible plates are assembled with the bronze facing towards the rotor to improve cold start capability and compensate thermal expansion in the rotor. This makes HVQ Series particularly suited for mobile application.

100% replacement for Vicker, Rexroth Vane pump and cartridge kit 20V 20VQ 25V 25VQ 30V 30VQ 35V 35VQ 45V 45VQ 2520V 2520VQ 3520V 3520VQ 3525V 3525VQ 4520V 4520VQ 4525V 4525VQ 4535V 4535VQ

Handling:

For maximum service life, the pump should be protected from contamination. Filtering fluid before filling and during operation to maintain or exceed ISO cleanliness code 16/13. Appropriately size suction filter, with cold start bypass, of 149 micron absolute (100 mesh) and 10 micron absolute return line filter is recommended. Replaceable elements should be changed as filter supplier instructions.

The drive shaft must align with the power source shaft. Avoiding shaft end thrust and applications that impose radial loading.

The start-up procedures should be as follows:

Check the rotation of power source to match with rotation of pump.

Check inlet and outlet ports to assure all connections are properly installed and check all mounting bolts and flanges to assure all are tight and properly aligned.

Fill pump with fluid through the outlet port if the pump is mounted above the fluid level. The spline shaft models also need to be lubricated with an anti-fretting grease or similar lubricant.

Place all controls in the neutral position so the pump is unloaded during initial start-up.

Prime the pump within a few seconds when the pump is started.

Bleed off entrapped air from outlet circuit until a steady output flow is observed.