Principles and precautions for selecting hydraulic pumps

Selection of hydraulic pumps is the main principle of the type of host equipment; selection of hydraulic pumps to consider the main factors are structural form, working pressure, flow, speed, efficiency, quantitative or variable, variable mode, life, the type of prime mover, noise, pressure pulsation rate, self-absorption capacity, compatibility with the hydraulic oil, size, quality, economy, maintenance and so on.

the choice of hydraulic pump type

Selection of hydraulic pump type should be based on: system operating conditions, system pressure and flow, working environment and other aspects.

1. according to the operating conditions of the system to choose a single executive element

Constant speed, the choice of quantitative pumps; fast and slow running conditions, select the double pump or multiple pumps; variable speed operation and the requirement of pressure, the choice of variable pumps.

2. According to the system working pressure and flow selection

High pressure and high flow, choose the piston pump; medium and low pressure gear pumps or vane pumps.

3. Choose according to the working environment

Field work and poor environment, choose gear pumps or piston pumps; indoor or fixed equipment or environment good choice of vane pumps, gear pumps or piston pumps.

After determining the type of hydraulic pump, according to the system required pressure, flow size to determine its specifications.

hydraulic pump maintenance and repair

Hydraulic pump maintenance is mainly the correct use of the pump management and timely treatment of abnormalities in the operation, as well as the filtration of the working medium, to eliminate minor faults, etc.; thereby improving the use of hydraulic pumps in a timely manner to ensure that the normal operation of the pump to extend the service life of the pump.

Hydraulic pump damage is mainly due to: wear and tear of pump parts, corrosion, fatigue damage; pump manufacturing factors or accidents. Repair due to normal or abnormal causes of pump damage, the essence of its deterioration of compensation. There are two basic means of hydraulic pump repair, repair and replacement.

Precautions in the application of hydraulic pumps
① Try to avoid starting the hydraulic pump with load as much as possible;
② When piping, attention should be paid to avoiding excessive oil suction resistance of the hydraulic pump;
③ The overflow valve installed inside the hydraulic pump should not be used for system pressure regulation, but should only be used as a safety valve;
④ It should be avoided to merge the oil discharge pipes of several pumps into an equal diameter pipe before connecting them to the fuel tank;
⑤ Avoid connecting the drain pipe of the hydraulic pump to the main return pipe of the system;
⑥ Soft rubber or plastic pipes should be avoided as suction pipes for pumps;
⑦ The highest part of the oil pipe connected to the drain port on the hydraulic pump body should be avoided from being lower than the axis of the pump;
⑧ The installation position of the plunger pump should be lower than the oil tank level;
⑨ The outlet of the main overflow valve of the system and the leakage oil pipe of the hydraulic pump should not be directly connected to the suction pipe of the hydraulic pump;
⑩ Prohibit excessive coaxiality between the hydraulic pump shaft and the prime mover shaft after assembly.