From the repair practice, we explored the causes and repair methods of common faults of vacuum pumps. The H-9 type is taken as an example. The following are introduced: 1. Causes and solutions for the decrease of vacuum degree 1. Determination method of damage of exhaust valve plate: start The motor, after a few minutes, touch the cover of the exhaust valve by hand, the temperature is not uniform and the bonnet surface is heated too fast, too high, the valve piece is damaged. Solution: Replace the valve plate.
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