the main factors damage the sealing member

Sealing component damage is a major factor in the working fluid impurities. These impurities in the sealing member between the grinding, the valve leak. Therefore, the appropriate level of foreign has proposed hydraulic components should be used accordingly precision filter. They believe 5μM oil pump sealing element, if the filtering accuracy of a filter 3/μM life than the use of up to 10 times 10μM.
But the hydraulic valve bracket, the working environment is very bad. In the coal face, tubing length of hose nipples over 1000 meters, the joint socket up to more than 4000, no special dust tank facilities. Emulsion has a lot of floating impurities, Bottom of the column and the valve chamber, leaving more coal, grain and iron rock. Inlet valve and seat, as open and close more frequently, liquid flow rate is high, sealing will soon fail. Proven to reduce hydraulic system fluid contaminants, it is very difficult, it was once envisaged in the emulsion pump high-pressure filters, together with an increase in each bracket small inlet filter. But is blocked in the work quickly, to form stop.
On the other hand, as technology evolves. The performance of the valve and valve life put forward higher requirements. Currently, when equipped with a 120 mesh filter and the magnetic filter device conditions, with the valve being tested by the total emulsion flow rate and the valve opening and closing times, to measure the hydraulic valve life. But in fact the actual underground room type test results of the work with a big difference. Many countries are now in the form of experiments, an increase of china hydraulic hose anti-pollution requirements, some of them in the proper emulsion mixed with pulverized coal, some added mechanical impurities. To do this, you need to use the new, anti-pollution ability, suitable for underground working conditions manifold seal pair.
Hydraulic support various hydraulic valve life is low, foreign ways and means to solve the system is to improve the filtering accuracy and improving the quality of the emulsion, but with little success. This paper analyzes the stent valve sealing of the development process, discusses the sealing materials and sealing performance relationship. Pointed out the sealing technology is to improve the service life of hydraulic valve hydraulic support the key.