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China VG Combination Pump - High-Quality Oil Pump Suppliers & Factory for Efficient Installation
Inlet and outlet connection
- Select the inner diameter of the pipeline according to the oil port of the oil pump (the optimal inlet velocity is 0.6-1.2m/s);
- The design dimensions of the suction tubing line must comply with the allowable inlet working pressure (absolute value of 0.8bar to 2bar), and must avoid bending the suction tubing line and the combination of several pump suction tubing;
- If the oil suction filter is used, it is recommended that the oil suction filter be selected according to the maximum flow of the oil pump, multiplied by the coefficient of 2-3 times, and the absolute filtration accuracy is 50-180um. It must be ensured that even if the filter is polluted, it will not exceed the minimum allowable inlet working pressure of the system;
- The immersion depth of the selected suction tubing should be as deep as possible. Eddy currents should not be formed even at the maximum flow rate, otherwise there will be a risk of air suction and release;
- In the design of suction pipe, the oil inlet is not recommended to be installed vertically downward.If the oil tank is located below the oil pump, the oil inlet should be up or on both horizontal sides.
The combination of pump
- When combining pumps,it is necessary to ensure that each stage complies with the allowable working data of the relevant pump type;
- The rotation direction of all combined pumps must be the same;
- Pumps with maximum torque,variable displacement or applied load shall beprovided as the first stage of the combined pump;
- Maximum shaft drive torque must be checked by the project planner for various applications.
Maximum permissible torque(Nm)
| Type | Drive torque | Outlet torque | |
|---|---|---|---|
| …E Keyed shaft | …R Spline shaft | ||
| VGO | 250 | 250 | 150 |
| VG1 | 450 | 450 | 280 |
| VG2 | 1100 | 1400 | 700 |
- The total torque of the combined pump shall not exceed the maximum driving torque.
- Combination inhalation is not allowed.
- Rear pump shaft design must be "R"(spline).
Initial operation
- Check whether the hydraulic system is properly installed and connected at the initial start;
- Before operation, should through the suction tubing or flow line for internal filled with hydraulic oil pump, oil relief valve, open the system under the condition of no load operating motors, stay sufficient lubrication oil pump, and discharge the air in the piping (oil is not set the relief valve, such as system can use the pump export joint relax a little, some methods for exhaust gas leak. When bubbles no longer appear in the leaked oil, the loosened part shall be locked according to the specified torque. Note: when using this method, it must be under low pressure condition and ensure that the pressure does not rise.)
- Unable to start loading, otherwise it will cause internal damage of the oil pump;
- After repeated dot operation, the suction sound will disappear, and the continuous operation can be carried out only after the air mixing sound disappears. If the air mixing sound does not disappear after repeated dot operation for several times, it should be that there is air leakage in the pipeline at the inlet side.
Maintenance
- In order to improve the service life of the oil pump,the abnormal vibration, noise, oil temperature, oil condition of the hydraulic system, whether there are bubbles in the tank and whether there are leaks and other problems should be checked regularly and maintained in time;
- All the oil pumps have passed the performance test before leaving the factory. Any enterprise or individual shall not disassemble, reassemble or transform the oil pumps without the permission of the company. If disassemble, reassemble or transform the oil pumps without the permission of the company, it is not within the scope of the company's repair report and the company shall not assume any responsibility.
Frequently Asked Questions
Q
What is the optimal inlet velocity for the oil pump pipeline?
The optimal inlet velocity for the oil pump pipeline should be selected within the range of 0.6 to 1.2 m/s, based on the specific oil port size of the pump.
Q
What pressure limits should be followed when designing the suction tubing?
The design dimensions of the suction tubing line must strictly comply with the allowable inlet working pressure, which has an absolute value ranging from 0.8 bar to 2 bar. Bending the suction tubing line or combining several pump suction lines should be avoided.
Q
How should the oil suction filter be chosen and sized?
It is recommended to choose a filter based on the maximum flow of the oil pump multiplied by a coefficient of 2-3 times. The absolute filtration accuracy should be 50-180um. Ensure that the minimum allowable inlet working pressure is not exceeded even if the filter becomes polluted.
Q
What is the maximum permissible torque for the VG2 series pump?
For the VG2 series pump, the maximum permissible drive torque is 1100 Nm for the Keyed shaft (…E) and 1400 Nm for the Spline shaft (…R). The maximum permissible outlet torque is 700 Nm.
Q
What must be done during the initial operation phase of the pump?
Before starting, fill the pump internally with hydraulic oil through the suction tubing or flow line. Run the motor under no-load conditions to ensure sufficient lubrication and completely discharge any air in the piping before applying a load.
Q
Can I disassemble or modify the oil pump myself?
No. All oil pumps pass performance tests before leaving the factory. Disassembling, reassembling, or transforming the pumps without official permission will void the warranty and repair report, and the company will not assume any responsibility.