First, the valve will not work. Reasons:
1> control channels were blocked by debris (channel small, easy to plug);
2> piston for rust stains card in the highest position; although the upper force, but can not move down, could not open the main channel. Therefore, the piston valve must be installed before the filter; for new installations or long-term disabled valve, be sure to open the inspection and cleaning.
The second is the valve through, can not afford to decompression. Reasons:
1> piston in a position (not the highest position);
2> main valve stem in a position of cylinder disc guide hole needle valve (valve) (not the seal position);
The fracture of 3> main valve spring failure or lower;
4> pulse valve stem in the valve seat hole of a place (not the seal position) stuck, so that the piston is always under pressure;
Between 5> main valve and main valve two sealing surface, instrument valves with dirt stuck or nick;
6> diaphragm failure due to fatigue or damage. For the valve, with particular emphasis on regular inspection. Found dirt, rust stains to be removed in a timely manner; piston ring damage should be updated; spring failure to replace available; sealing surface if not closed, valve should be reground; diaphragm failed to change; as identified by the use of the valve handle is coarse, use sandpaper.
The last is the pressure valve can not be adjusted. In addition to the above reasons, there are: ① adjusting spring failure; ② cap seams leak, can not keep up the pressure. It also depends on the timely check processing to prevent. In addition, there is a phenomenon, is the valve pressure pulse wave, the safety valve is very unstable. This is the input medium and output medium is too big difference, therefore, should be quite re-select valve diameter valve.
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