Fluid Compatibility
The standard pump is supplied with nitrile rubber seals suitable for use with mineral oils, water, oil/water emulsions, paraffin and glycerine. The pump body should not be left in contact with water for prolonged periods. After using salt water in the pump, thoroughly flush clean.

Ethylene Propylene (E.P.) seals are available to order for applications using phosphate ester based hydraulic fluids and vegetable based brake fluid. E.P. seals are compatible with skydrol 500KB and LD4. Please contact our technical department if in doubt.

Pressure Relief Valve
A factory fitted pressure relief valve may be fitted to the pump and set at any specified pressure between 56 and 700 bar. We strongly recommend that all hydrapaks are fitted with a pressure relief valve to prevent overloading and exceeding maximum safe working pressures.

Gauges
100mm gauges and a fixing kit are available for horizontal mounting of a pressure gauge above the top of the pump. For pumps with a double acting valve, a fixing kit for vertical mounting is supplied. Six standard gauges corresponding to the six standard pressure ratings are available.

Double Acting Valve
A three position four port valve for control of double acting cylinders is offered as a factory fitted option. Valve outlets are tapped 3/8 NPT. There is no release valve assembly fitted to the pump body and, although internal leakage of the valve is minimal, isolation valves should be fitted to circuits where pressure must be sustained.

Tanks
A range of standard tanks to satisfy most requirements is illustrated in the diagram above. They Hydrapak can easily be fitted to custom built tanks.

Interchangeable Plungers
High/low pressure plunger kits can be supplied to change the pressure/flow characteristics to any of the six standards.