1 The rated pressure should be selected according to the different system working pressure to select the appropriate gear pump. The rated pressure of the pump should be 1.1 to 1.5 times the opening pressure of the safety valve of the hydraulic system.


2 The nominal displacement should be selected according to the pump's nominal displacement, first according to the system required flow qv (L / min) and the primary selected hydraulic pump speed n1 (r / min) and pump volumetric efficiency ηv (according to the product The sample is taken or taken as ηv=0.9) to calculate its reference value.


Since the gear pump is a dosing pump, the final selected pump flow is as close as possible to the required flow rate of the system to avoid excessive power loss.


3 The speed should be selected according to the nominal displacement of the selected gear pump and the required flow rate of the system, and the actual speed of the gear pump should be calculated as close as possible to the rated speed of the product.


4 Determination of drive power After the nominal displacement of the gear pump, the rotational speed (the operating speed at which the maximum working pressure can be varied within a certain range) and the working pressure are determined, the required input power (primer drive power) can be calculated.


5 multi-pump parameter selection For fast and slow alternate or multi-actuator hydraulic systems, in order to properly match and use power, two or multiple pumps can be used to solve the problem of multiple hydraulic sources. In the selected multi-pump, the first pump should be able to withstand higher loads (pressure x flow) than the second pump; the total load of the multi-pump cannot exceed the torque that the pump shaft can withstand.


6 Selection Precautions In the case of indoor and environmental noise requirements, attention should be paid to the selection of products with control structure for noise. In general, the noise of the external gear pump is large, and the noise of the internal gear pump is small.


The reliability, economy, ease of use and maintenance, and timeliness of supply of gear pumps should be considered comprehensively. It is necessary to give priority to products that have been identified and matured by relevant national departments and industries.



Precautions for gear pump selection In the case of indoor and environmental noise requirements, attention should be paid to the selection of products with control structure for noise. In general, the noise of the external gear pump is large, and the noise of the internal gear pump is small.

The reliability, economy, ease of use and maintenance, and timeliness of supply of gear pumps should be considered comprehensively. It is necessary to give priority to products that have been identified and matured by relevant national departments and industries

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