Analyzing the reasons for the disorder of the upstream thread of the pressure gauge movement may have the following three aspects:

1. The balance spring is not flat when the pressure gauge is assembled or adjusted, especially when the balance spring is placed. If the pressure gauge is subjected to greater vibration during transportation or handling, the balance spring may hang on the fan teeth. When the pressure gauge is used, the fan teeth will disturb the balance spring.

2. If the installation position of the pressure gauge is incorrect, for example, the pressure gauge is not installed vertically, but installed horizontally or obliquely. When the balance spring is placed, the balance spring may sag due to its own weight, and the balance spring may hang on the fan teeth. When the pressure gauge is running, the sector teeth will disturb the balance spring.

3. If the pressure gauge greatly exceeds its range in use, causing the balance spring to bulge too high, the fan teeth will disturb the balance spring, which is the cause of the balance spring disorder.

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