What Are The Factors That Affect The Hydraulic Valve Sealing Performance?
What are the factors that affect the hydraulic valve sealing performance?
The main cause of damage to the sealing element is the impurities in the working fluid. These impurities are milled between the sealing elements to cause leakage of the valve. Therefore, foreign countries have proposed the corresponding level of hydraulic components, hydraulic valve should be used with the appropriate accuracy of the filter. They believe that 5μM oil pump sealing components, if the filter accuracy of 3 / μM filter, life can be compared with 10μM increase of 10 times.
But the hydraulic support valve, the working environment is very bad. In the coal mining face, tubing total length of more than 1000 meters, connector jack up to more than 4000, the tank without special dust-proof facilities. There are a lot of floating impurities in the emulsion, in the column cylinder and the valve chamber, leaving more coal, hydraulic valve rock and iron. Into the spool and valve seat, because the opening and closing more frequent, high liquid flow rate, the seal will soon fail. Practice has proved that it is very difficult to reduce the contaminant impurities in the hydraulic system of the support system. It was envisaged that the high pressure filter was used in the emulsion pump station and a small filter was added at the entrance of each stand. But in the work quickly blocked, hydraulic valve the formation of drying up.
On the other hand, with the development of hydraulic support technology. The use of the valve performance and valve life of the proposed higher requirements. hydraulic valve At present, the life of the valve is measured by the total flow rate of the emulsion passing through the test valve and the number of valve opening and closing times under the conditions of a filter with a 120 mesh and a magnetic filter. But in fact the indoor type test and the actual results of the actual difference between the great. Now many countries in the form of experimental, increased anti-pollution requirements, some in the emulsion into the appropriate coal, and some add mechanical impurities.
To this end, the need to use a new type, anti-pollution ability, hydraulic valve suitable for underground working conditions of the seal.