The common faults and causes of the pneumatic regulators produced by valve manufacturers on the market are that the regulator cannot operate, the regulator can not operate stably, the regulator vibrates, the regulator action is sluggish, the regulator water leakage increases, and the flow range of the regulator of the pneumatic solenoid valve manufacturer decreases. Wait.

One, the regulator does not work. The failure phenomena and reasons are as follows:

There is no signal and no gas source.

One is that the air source is not turned on;

In winter, the air source contains water and freezes, causing the air duct to be blocked or the filter and the three-position three-way solenoid valve to be blocked;

c Compressor failure;

4. Leakage of main pipe gas source.

There is air source, no signal signal.

a The governor is faulty;

The signal lamp tube is leaking;

③Leakage of positioning bellows;

(4) Regulate omentum damage.

The positioning device is airless.

One is that the filter is blocked;

2% of safety valves fail;

③ Leaking or blocked pipes.

The positioner has a gas source but no output, and the orifice of the imported gas solenoid valve positioner is blocked.

There is a signal, there is an action, and there is no action.

②The spool falls off,

2. Use the valve core or valve seat to jam;

③The rod is bent or broken;

④Scaling or fouling on the valve seat and valve core;

74 The actuator spring is rusty due to long-term non-use.

Second, the action of the regulator is unstable. The failure phenomena and reasons are as follows:

The pressure of the air source is unstable;

②The compressor capacity is too small;

2 The pressure reducing valve fails.

The signal pressure is unstable.

(a) The time constant (T=RC) of the control system is improper;

②The output of the regulator is unstable.

The air source pressure is stable and the signal pressure is also stable, but the action of the regulator is still unstable.

②The ball valve of the amplifier in the positioner is not tightly closed due to visceral wear, and when the air consumption is particularly large, it will produce an output shock;

Second, the nozzle baffle of the amplifier in the positioner is not parallel, and the baffle cannot cover the nozzle;

③ Leakage of gas pipeline and transmission line

4. The rigidity of the actuator is too small;

When the valve stem moves, the frictional resistance is large, and the contact part is blocked.