System category      Lubrication system      Transmission system      Stochastic system      Special request system

 Pressure (Mpa)                0～25                                      ≥150                     ≤210                              ≤350

                                                                     ≤0.025～0.05

    Graininess                      ≤0.1                                       ≤0.005                 ≤0.005                           ≤0.001

Technical requirements for hydraulic filters: (1) The filter material should have a certain mechanical strength to ensure that it will not be damaged by hydraulic pressure under a certain working pressure. (2) Under a certain working temperature, the performance should be stable; there should be sufficient durability. (3) Good anti-corrosion ability. (4) The structure is as simple as possible and the size is compact. (5) Easy to clean and maintain, easy to replace the filter element. (6) Low cost. The working principle of the hydraulic filter: as shown in Figure 1, the working principle of the filter is simplified. The hydraulic oil enters the pipeline from the left to the filter, flows from the outer filter element to the inner core, and then flows out from the outlet. When the outer filter element is blocked, When the pressure increases and reaches the opening pressure of the overflow valve, the oil passes through the overflow valve, to the inner core, and then flows out from the outlet. The outer filter element has higher precision than the inner filter element, and the inner filter element belongs to coarse filtration. Hydraulic filter test method: The international standard ISO4572 has been widely adopted in various countries in the world to evaluate the "multi-pass method for the filtration performance of hydraulic filter elements". The test content includes determining the filter element, the pressure difference characteristics of the plugging process for different sizes of filtration ratios (β value), and Staining capacity. The multiple-pass method simulates the actual working conditions of the filter in the hydraulic system. Pollutants continue to invade the system oil and are continuously filtered out by the filter, while the unfiltered particles return to the fuel tank and pass the filter again. Device. In order to meet the needs of high-precision filter performance evaluation, as well as due to the change of test dust and the adoption of new calibration methods for automatic particle counters, ISO4572 has been modified and improved in recent years. After the modification, the new standard number has been adopted through the test method several times. ISO16889.

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