The pressure gauge sometimes has abnormal tapping displacement that is too large, the pointer of the pressure gauge is off zero or the pointer runs irregularly. When the pressure gauge is repaired, it is found that it is caused by the loosening of the pressure gauge movement. It is precisely because of the "movement looseness" that when tapping the case, the pressure gauge pointer exhibits an abnormal displacement; it is precisely because of the "movement looseness" that the pressure gauge pointer moves away from zero; it is also because of the "movement movement". "Looseness" will cause irregular operation of the pressure gauge pointer. So what is the cause of the loosening of the pressure gauge movement?

Cause Analysis:

1. For the pressure gauge of the formal movement, the reason for the loosening of the pressure gauge movement is that after the pressure gauge is adjusted, the fixing screw of the pressure gauge movement is not tightened, so that during the operation of the pressure gauge, due to The repeated pulling force of the connecting rod will loosen the movement; second, the defects of the delivered pressure gauge movement itself are caused by the failure of the screws that fix the upper and lower plates on the movement, which causes the movement of the pressure gauge during operation. The upper or lower board is loose. If the on-site vibration of the pressure gauge is large and the time is long, it will even shake off the upper plate of the movement.

2. For pressure gauges with reverse-mounted movement, the reason for the loosening of the pressure gauge movement is that the movement of the pressure gauge is not riveted when riveted to the joint, but loosens during use; the other is that the movement of the pressure gauge is riveted. When the outer diameter of the rivet is too small, or the rivet hole is slightly larger, the movement of the pressure gauge may become loose during use.

3. Another is that the user of the pressure gauge disassembled the movement of the pressure gauge out of curiosity or kindly repaired it but failed to install it.

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