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4 point usage requirements for hydraulic filters in hydraulic accessories

How to identify the quality of a hydraulic filter in the hydraulic accessories Introduce several test principles and methods:

1. Test principle of hydraulic filter water intrusion method for hydraulic accessories: The water intrusion method is a method specially used for the test of hydrophobic filter element. A hydrophobic membrane is waterproof, and the smaller its pore size, the more pressure it will take to squeeze water into the hydrophobic membrane. Therefore, under a certain pressure, the water flow into the filter membrane is measured to determine the pore size of the filter element.

2. The reason why the diffusion flow method of hydraulic accessory oil filter is better: the bubble point value is only a qualitative value, and it is a relatively long process from the beginning of the bubble to the back of the bubble group, which cannot be accurately quantified. The measurement of diffusion flow is a quantitative value, which can not only accurately determine the integrity of the filter membrane, but also reflect the porosity, flow rate and effective filtration area of  the filter membrane. reason.

3. Test principle of hydraulic filter bubble point method for hydraulic accessories: when the filter membrane and filter element are completely saturated with a certain solution, and then pressurized on one side by the air source (this instrument has an air intake control system, which can stabilize the pressure, adjust the air intake). The engineer said: As the pressure increases, the gas is released from one side of the filter membrane, indicating that there are bubbles of different sizes and numbers on one side of the filter membrane, and the corresponding pressure can be judged by the instrument Values​are bubble points.

Hydraulic filter test principle Hydraulic accessory diffusion flow method: The diffusion flow test means that when the gas pressure is 80% of the bubble point value of the filter element, there is no large amount of gas perforation, but a small amount of gas is first dissolved into the liquid phase diaphragm, and then Diffusion from the liquid phase into the gas phase on the other side is called the diffusion flow.