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China VG Combination Pump - Reliable Oil Pump Installation by Leading Suppliers and Factory
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 be provided 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 | ||
| VG0 | 250 | 250 | 150 |
| VG1 | 450 | 450 | 280 |
| VG2 | 1100 | 1400 | 700 |
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The total torque of the combined pump shall not exceed the maximum driving torque.
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Combination inhalation is not allowed.
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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 (FAQ)
Q: What is the optimal inlet velocity for the oil pump pipeline?
A: The optimal inlet velocity for the pipeline should be selected according to the oil port of the oil pump, generally between 0.6 and 1.2m/s.
Q: How should a suction filter be selected for the oil pump?
A: It is recommended to select the oil suction filter according to the maximum flow of the oil pump, multiplied by a coefficient of 2-3 times. The absolute filtration accuracy should be 50-180um, ensuring it will not exceed the minimum allowable inlet working pressure.
Q: What are the key rules to follow when combining multiple pumps?
A: Each stage must comply with the allowable working data of its pump type, and all combined pumps must have the same rotation direction. Additionally, pumps with maximum torque, variable displacement, or applied load must be positioned as the first stage.
Q: What is the maximum permissible torque for a VG2 spline shaft?
A: The maximum permissible drive torque for a VG2 Spline shaft (...R) is 1400 Nm, and its maximum outlet torque is 700 Nm.
Q: How do you properly exhaust air from the piping during initial operation?
A: Fill the pump internally with hydraulic oil, open the system under no-load condition, and run the motor. If there is no relief valve, slightly loosen the pump export joint under low pressure to let the air leak out until bubbles no longer appear, then lock it back to the specified torque.
Q: Does unauthorized disassembly affect the warranty of the oil pump?
A: Yes. Any enterprise or individual must not disassemble, reassemble, or transform the oil pumps without the permission of the company. Doing so voids the company's repair report and removes all company responsibility.