The first is the accuracy of each of the hydraulic system must consider the purity of the hydraulic oil, which is the original purpose of the use of oil filters, so the first thing to consider is the accuracy. Some people will say: That being the case, I’d choose the highest accuracy of the filter does not have to? In fact, this is a big misunderstanding, the hydraulic system filter precision is not required for “high” but “appropriate.” Through high-precision filter through the oil capacity is relatively poor (and precision filter installed in different locations can not be the same), high-precision filter is also easier to plug, If you must use an impact if oil flow rate, a short life, It must be changed frequently. Followed by the strength and corrosion resistance, a good hydraulic oil filter strength must be compliance, line filter cartridge to withstand high pressure downstream of the pump, oil filter cartridge To ensure that the premise does not affect the amount of oil pass, can withstand the pressure no distortion, mesh does not change the diameter of the accuracy change. At the same time some of the oil used by the system has a certain corrosive, particularly the use of ordinary filter or corrosion-resistant filter according to the actual circumstances. Consider the installation position, which is also a very important part, if you are unsure where to install, you can not select the filter, the filter functionality and accuracy is also different in different locations, installed in the suction mouth: Usually in the suction mouth, there will be a surface-type filters preliminary filter larger impurities filtration capacity should be more than twice the pump flow and pressure loss of less than 0.02Mpa; installed in the oil port of the filter: the role of this filter is to filter out possible intrusion valves element contamination, the accuracy is generally 10 ~ 15μm, and the performance of oil on the road to withstand the impact of work stress and pressure, the pressure drop is less than 0.35Mpa.