Considerations for Selecting a Hydraulic Pump

Hydraulic pump rated working pressure is generally 25-60% higher than the working pressure; the high pressure listed on the product sample is the allowable pressure during short-term shocks. It is therefore prohibited to have shock pressure in every working cycle to avoid shortening the lifespan of the hydraulic pump or even causing damage. The oil discharge pressure should not be too high, otherwise it is also prone to damaging the oil pump.

Hydraulic cylinders are the actuating mechanism of the entire hydraulic system, making their selection crucial. Non-standard cylinders should never be used, and the safety factor of the hydraulic cylinder must not be too low. Do not ignore the dimensional tolerances of the cylinder barrel, ear ring, and pin shaft. To reduce the aerodynamic pressure of the hydraulic cylinder and ensure that no "sticking" occurs during movement, sufficient attention should be given to the dimensional tolerances of the cylinder.

Hydraulic motors are an important actuating mechanism in hydraulic equipment. When considering options for hydraulic motors, the following points should not be overlooked: Since displacement and pressure are inversely proportional when the load torque is constant, that is, high pressure results in low displacement; conversely, high displacement occurs with low pressure, thus the displacement size is an important indicator of the hydraulic motor's working capacity. The speed of the hydraulic motor cannot be too low or too high. When the speed is too low, it can cause creeping due to unstable friction and leakage, severely affecting the stability of the working components. To expand the speed range, it is better to choose motors with lower low-speed values for greater variety.

Hydraulic Control Valve Selection Considerations:

The rated pressure of hydraulic valves should generally be close to the operating pressure, but for systems with high reliability requirements, the rated pressure of the valve should be significantly higher than the operating pressure.

Flow Rate and Bore Selection Taboos: The flow rate is primarily used to indicate the specifications of medium and low-pressure hydraulic valves. It is taboo to have a significant discrepancy between the rated flow rate of the valve and the actual flow rate used, as this would result in excessive volumetric loss. The nominal size of the inlet and outlet of the hydraulic valve fluid is called the bore, which is mainly used to indicate the specifications of medium and high-pressure series hydraulic valve products. However, hydraulic valves with the same bore but different designs may not have the same rated flow rate at different pressures. Designers should select the appropriate bore based on the operating pressure and flow rate, utilizing the hydraulic valve characteristic curves provided by the hydraulic component manufacturers.