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Commercial Vehicle Hydraulic Filters

Technical requirements of hydraulic filter :(1) filter material should have a certain mechanical strength, to ensure that under a certain working pressure will not be damaged by the effect of hydraulic pressure. (2) At a certain working temperature, the performance should be kept stable; It has enough durability. (3) Good anti-rot 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 hydraulic filter: Diagram as shown in figure 1, the working principle of the filter into the hydraulic oil from the left line to filter, from the filter flow to the inner core, again from export flow, when the filter clogging, pressure, to achieve the relief valve opening pressure, the oil through the overflow valve, the inner core, again from exports, outside filter than inside the filter of high precision, the element belongs to the coarse filtration. Hydraulic filter test method: the international standard ISO4572 has been widely used in the world to assess the "hydraulic filter core filtration performance of multiple pass method", the test content includes to determine the filter core, the filter ratio of different sizes (β value) plugging process pressure difference characteristics and scale capacity. The multi-pass method simulates the actual working condition of the filter in the hydraulic system. The pollutants constantly invade the system oil and are filtered out by the filter, while the particles that fail to be filtered return to the tank and pass through the filter again. In order to meet the needs of high precision filter performance evaluation, and because of the change of test dust and the use of new automatic particle counter calibration method, ISO4572 has been modified and improved in recent years, after modification, the new standard number ISO16889 has been adopted by the test method for many times

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