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Automatic valve troubleshooting and prevention
One of the fault, the valve impassability. Reasons are:
1, control channel is sundry jam (channel small, easy to jam);
2, piston for rust stains card at the highest position; Although the upper stress, but can't move, can't open main channel.
So, before the piston pressure reducing valve must be installed filter; For new installation or long-term discontinuation of the pressure reducing valve, be sure to disassemble and clean.
The second failure, the valve through, no relief effect. Reasons are:
1, piston in a certain position (not the highest position) stuck;
2, the main valve valve handle in the cylinder plate guide hole a position (not closed position) stuck;
3, the main valve disc lower spring break or failure;
4, pulse valve handle in the seat hole a position (not closed position) gets stuck, make piston is always subject to pressure;
5, the main valve disc and seat sealing surface between the two main, dirt stuck or Nick;
6, diaphragm for fatigue or damage and failure.
For reducing valve, especially emphasize regular inspection. Such as the discovery of dirt, rust stains to remove in time; Piston ring damage should update; Spring failure must be replaced with available; Facing such as is not closed, should be reground; Diaphragm hard to replace; By the use of such as confirm valve handle thicker, and the application of sand paper burnish.
After the valve pressure can not be adjusted. In addition to the outside of all sorts of reasons, there are:
1, adjust spring failure; 2, cap joint leakage, can not keep up the pressure.
This also want to rely on timely check processing to prevent.
In addition, still have a kind of phenomenon, is the valve after pressure pulse wave, unstable. This is the input medium and output medium differential is too big a result, should choose again valve diameter a valve. There is a cause valve pressure instability after the reason for this is that regulation spring improper selection; A nominal pressure reducing valve, regulating spring there are several, such as nominal pressure for 16 kilograms per square centimeter, adjust spring have 1-3 kg/cm2, 2-8 kg/cm2, 7-11 kg/cm2 three, if the valve after pressure just 1-3 kg/cm2, and spring is 7-11 kilograms per square centimeter of that kind of, valve pressure after the adjustment is not allowed.
