Pressure gauges are widely used and play a role in pressure measurement, especially in some pressure vessels such as boilers. They are an indispensable part. The verification and calibration of pressure gauges are of great significance to ensure safe production. The following will briefly introduce several common pressure gauge faults.

1. When the pressure changes, the pressure gauge pointer does not rotate normally. There are generally the following reasons for this situation: the check valve is not opened, the oil cup control valve is not tightened, the joint is leaking, the pressure gauge has a water pipe or connecting pipe blockage, the pointer is stuck, or the connection with the rotating shaft is loose.

2. During the test, the pressure gauge pointer shakes and indicates unstable. Generally, there are several reasons for this situation: the pressure gauge hairspring is damaged, the center shaft is bent and deformed, the water storage pipe is blocked, the teeth are worn, the teeth have debris, the shaft hole is worn, and the two sides of the shaft cannot rotate concentrically.

3. The pressure gauge pointer does not return to zero. The main reasons for this problem are: the pressure gauge pointer is stuck, the pressure gauge water storage pipe or connecting pipe is blocked, the plug is blocked, the connection between the pointer and the rotating shaft is loose, or the elasticity of the spring tube is reduced.

4. The measurement accuracy of the pressure gauge exceeds the allowable error range. The main reasons include: cock leakage, irreversible deformation of the spring tube, hairspring disorder, gear aging and wear, etc. The main thing to note is that this type of fault is relatively hidden and needs to be taken seriously.