The role and characteristics of the filter described as follows: (1) suction filter The filter is located in the suction pipe of the pump, filter out the residual pollutants in the tank through the air holes into the contaminants, a protective pump. However, in order to avoid cavitation in the pump, sufficient attention should be paid to the pressure loss. Generally, a coarse metal mesh or notch wire material of 100-200 mesh is used. Therefore, it is not a filter that controls the pollution concentration of the system. (2) High pressure pipe filter (a) It is installed on the outlet pipe of the pump to protect the pollutants from entering the system. Therefore, the system's pollutant concentration can be controlled. However, because it is a high pressure main line, to be affected by the pulsation and pressure of the pump impact, so the filter element material, strength should be carefully considered. (3) High-pressure line filter (b) In the system, this filter, also called the terminal filter, is installed in order to protect the hydraulic components that are particularly sensitive to contamination. It is therefore often smaller than other filters. Therefore, when used to choose a large capacity. In addition to the components of the material, the intensity of the same with (a) to give full consideration. (4) The return filter is located on the system's return line to capture contaminants generated or intruded into the system before returning to the tank. It is therefore the most effective and important filter that controls the concentration of contaminants in the system. Although it is a low-pressure pipe, pulsation or pressure shock may occur depending on the operating conditions of the transmission. Therefore, the material and strength of the element should be fully considered. (5) The circulation filter is installed on the oil return path of the circulation of the fuel tank. Since the capacity of the system is large, it is often used when strict cleanliness is required. Even if the system is not working, pollutants in the fuel tank can be trapped. Therefore, , The most effective way to reduce the concentration of pollution. In addition, the cooler is installed, which has the advantages of being capable of cooling at the same time and being easy to be repaired. But need to use special pumps and motors, high cost. (6) The air filter is installed on the fuel tank to prevent the contamination from being mixed with the air into the fuel tank due to the change of the fuel quantity of the fuel tank. Therefore, the filter accuracy to have the same performance with the filter, the capacity to leave sufficient room to prevent the hole due to obstruction to make the tank pressure becomes negative pressure, causing pump cavitation. Pay particular attention to the harsh environment. Regarding the above filters, the installation location should be selected according to the characteristics of the equipment. Specific selection points: (1) the pressure of 140kg / cm2 below the general low-voltage devices, usually only install the suction filter, but should also install the return filter and air filter (2) the pressure at 140kg / cm2 or more in general, High-pressure liquid device, the general use of backflow filters to control the concentration of pollution. However, there are special requirements for reliability, high pressure pipe filters should be used together. (3) electromagnetic proportional control valve or a small flow control valve, etc. To increase its reliability, should be set terminal filter. (4) When using the servo valve, efforts should be made to reduce the concentration of pollutants in the system. Therefore, a high-pressure and reflux filter should be used in combination. In the case of a large capacity, a circulation filter should be provided and a terminal filter should be installed in the auxiliary line.
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