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The necessity of oil filter and the filtering precision of stainless steel filter element because of the dirt, iron filings and so on outside entering the oil tank, and because of parts wear, assembly of components and tubing in the residue and oil oxidation deterioration precipitate mixed in the oil system, so the oil always contains a variety of impurities, it is not clean. When the impurity particle reaches a certain size, it will cause the relative moving parts to wear rapidly and even jam, or make the oil hole to block up and cause the system to not work normally, stainless steel filter element is indispensable in hydraulic system. The filtering accuracy of the filter is that the stainless steel filter can filter impurities of the particle size. The selection of the filtration precision of the system should be based on the following two principles: the impurity particles are smaller than the clearance of the moving parts or the thickness of the oil film, so as not to jam the moving parts or cause the parts to wear rapidly; The impurity particles should be less than the minimum cross-sectional area of the throttling hole in the system to prevent the hole from clogging. According to the size of the filter particles, stainless steel filter in addition to the accuracy of the pressure, the higher the filter accuracy requirements.
The common types of stainless steel filter according to the filter material and filter, stainless steel filter can be divided into mesh, wire gap, paper core, sintered and magnetic type and other types. All kinds of stainless steel filter performance mesh use: installed in the pump suction line to protect the pump filtration accuracy: mesh dimension 0.8 ~ 1.3 mm, the normal particles after filtration are 0.13 ~ 0.4 mm pressure/MPA: a pressure drop/103pa 0.5 features: simple structure, large oil flow capacity, poor filtering accuracy: line gap type use: installed in the hydraulic pump suction line or low-pressure system pressure line. Filter precision: line gap 0.1 mm, filter normal particles 0.02 mm pressure structure is simple, filter effect is good, oil capacity, but not easy to clean. Paper core-type use: for fine filtration, preferably with other stainless steel filter joint use. Filtering precision: the paper aperture is 0.03 ~ 0.07 mm, filtering precision can reach 0.005 ~ 0.003 mm. High filtering accuracy, but easy to plug, can not be cleaned, need to change the filter element. Sintered stainless steel filter use: can be used for different grades of precision filtration. Filtering accuracy: filtering accuracy can work in high temperature, pressure, strong corrosion resistance, simple manufacturing, stable performance, easy to plug, cleaning difficult. If there are particles falling off will affect the filtering accuracy.