Fixed Displacement Pump Care in Application
1. ln fixd displacement vane pump system, the open circuit is recommended.
2. Set Suction Port, the fluid transmission speed at the pump: must be between 0.6M/sec-1.5M/sec.
3. Set Discharge Port, the fluid transmission speed : must be between 2.3M/sec-4.75M/sec.
4. Set Suction, at the pump Suction Port must be between -150mmHg – + 0.5Kgf/cm².
5. Lay the suction piping under the fluid level at least 1M.
6. When connecting the pump to an electric motor, limit the tolerance of alignment between the two shaft centers to 0.05m/m TIR or angle ±1 degree.
7. Before starting, make sure that direction of the electric motor shaft rotates the same direction with the pump shaft as indicated with an the nameplate or on the housing of the pump.
8. When the pump is be operated for the first time, place the pump delivery side in NO-Load condition and repeat starting and stopping of the motor for several times, to eject the air from inside of the pump and piping, if keep on 10 minutes operation will be much better.
9. Viscosity range for a fixed displacement vane pump:
800 mm²/sec maximum for starting with delivery
200 mm²/sec maximum for starting at zero stroke
16 mm²/sec minimum at maximum operating temperature
10. ln selecting a hydraulic fluid, remember that the minimum permitted temperature in the hydraulic system must be at least 8°C above the pour point.
11. Air Bleed
All the time of first-starting, if the pump does not immediately prime, air should be bled from the pump delivery line. This may be accomplished by loosening a connection in the delivery line close to the pump until oil flows-indicating the pump has primed. An air bleed valve is available for this purpose.
12. Water-in-Oil Emulsions
Water-in-oil emulsions may be used. However, they require careful selection and monitoring of the fluid.
13. Synthetic Fire Resistant Fluids
Phosphate esters and their blends with operating viscosity of the petroleum oil described above may be used. These fluids are generally compatible with fluorocarbon and silicone elastomers.
14. Filtration Requirements
For satisfactory service life of components, use full flow filtration to provide fluid cleanliness conforming to ISO code 18/15 or better.