Packing element damage is the main factors of the impurity in the working fluid. These impurities grinding between the sealing element, make the leak valve. Abroad, therefore, has put forward the corresponding grades of hydraulic components, should adopt the corresponding precision filter. They think 5 microns pump seal element, if the filter filtration precision is 3 M/mu, longevity 10 times higher than the 10 microns. But with Industrial Valves hydraulic support, the work environment is very bad. In the mining face, tubing length of more than 1000 meters, joint pin up to more than 4000, tank no special dust-proof facilities. Emulsion in a large number of floating impurities, at the bottom of the cylinder and valve chamber, leaving more of pulverized coal and rock grains and iron filings. Into the liquid valve core and valve seat, because open shutoff is frequent, high liquid velocity, seal failure soon. Proved less support liquid of hydraulic system pollution of impurities, it is very difficult, someone once envisaged in the emulsion pump station adopts high pressure filter, in each bracket inlet at the same time increase the small filter. But was quickly blocked in the work, form. On the other hand, with the development of hydraulic support technology. The use of valve performance and valve life put forward higher requirements. At present, when equipped with 120 mesh filters and magnetic filter conditions, the total capacity of emulsion by testing valve and Industrial Valves opening and closing times, to measure the life of the hydraulic Industrial Valves. But in fact indoor type testing and downhole working results vary widely. Now many countries in the form of the experiment, increased the anti pollution for, have a plenty of mixed with appropriate coal powder in the emulsion, have a plenty of joining mechanical impurities. Therefore, you need to use the new, strong ability to resist pollution, is suitable for downhole working conditions of seal. The service life of all kinds of hydraulic valve in hydraulic support is very low, foreign way and solution is to improve the filtering precision of the system and improve the quality of the emulsion, but it is not big. In this paper, the development of the bracket valve seal, seal materials are discussed and the relationship between the sealing performance. Points out the sealing technology is the key to improve the service life of the hydraulic valve in the hydraulic support.
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