Common Faults And Precautions For Regulating Valves

Common faults and precautions for regulating valves

One of the faults, the valve is not available. The reasons are:

1 The control channel is blocked by debris (the channel is small and easy to block);

2 The piston is stuck in the highest position due to rust stains; although the upper part is stressed, it cannot move downwards and cannot open the main passage.

Therefore, the filter must be installed before the piston pressure reducing valve; for new or long-term decompression valves, it must be opened for inspection and cleaning.

The second problem is that the valve is straight through and cannot be decompressed.

The reason is that the piston is stuck at a certain position (not the highest position);

2 The main valve valve stem is stuck at a certain position (not the close position) of the cylinder disc guide hole;

3 The lower spring of the main valve disc is broken or invalid;

4 pulse valve valve stem is stuck at a certain position (not close contact position) in the seat hole, so that the piston is always under pressure;

5 between the main valve flap and the sealing surface of the main valve seat, there is dirt stuck or nicked;

6 The diaphragm failed due to fatigue or damage.

For pressure reducing valves, special emphasis should be placed on periodic inspections. If dirt and rust stains are found to be removed in time; piston ring damage should be updated; spring failure should be replaced with usable; if the sealing surface is not tight, it should be re-ground; if the diaphragm is not working properly, replace it; Thick, sandpaper applied.

Third, the pressure behind the valve cannot be adjusted. In addition to the above various reasons,

Also: the adjustment spring is out of order; the cap seam leaks and the pressure cannot be maintained.

One of the failures, the sealing surface leaked. The reasons are: debris between the sealing surfaces; damage to the sealing surface.

This type of failure is prevented by regular maintenance.