Hydraulic valve stent, the working environment

Hydraulic valve stent, the working environment is very bad. In the coal face, the total length of over 1000 meters tubing, 1 bsp fittings socket up to more than 4000, no special dust tank facilities. Emulsion in a large number of floating impurities in the column Bottom and valve chamber, leaving more coal, grain and iron rock. Inlet valve and seat, due to open and close more frequently, liquid flow rate is high, the seal will soon fail. Practice has proved that reduce contaminants hydraulic system fluid, it is very difficult, it was once envisaged in the emulsion pump high pressure filter, while increasing small filters on each stand at the entrance. But soon be blocked at work, forming a stop.
On the other hand, with the development of technology. The use of performance and service life of the valve valve put forward higher requirements. Currently, under the conditions when provided with a 120 mesh filter and a magnetic filter device, by using the test valve is opening and closing times of the total flow of the emulsion and the valve, to measure the life of the hydraulic valve. But in fact the actual downhole indoor type test results of the work vary greatly. Many countries are now in the form of experiments, an increase of anti-pollution requirements, or the incorporation of appropriate pulverized in emulsion, some added mechanical impurities. To do this, you need to use the new, anti-pollution and strong, suitable for underground working conditions manifold seal pair.