1. Start the motor. After the vacuum pump is running normally, open the outlet pressure gauge and the inlet vacuum gauge. Once the pressure readings are appropriate, gradually open the gate valve while simultaneously checking the motor load.
2. Briefly start the motor to check if the rotation direction is correct.
3. Regularly check the oil level. Adjust it to meet requirements if it is not within specifications. The oil level should be at the center of the oil level gauge when the vacuum pump is running. Regularly check the oil quality. Replace the oil promptly if it deteriorates to ensure the vacuum pump operates normally. Add bearing lubricating oil to the bearing housing and observe that the oil level is at the center line of the oil level gauge. Replace or replenish the lubricating oil as needed.
4. Close the gate valve on the outlet water pipe and the outlet pressure gauge and inlet vacuum gauge.
5. Check the vacuum pump piping and connections for any looseness. Manually rotate the vacuum pump to check for smooth operation. Generally, a vacuum pump should be inspected after 2000 hours of operation. Check the aging of the rubber seals, inspect the exhaust valve plate for cracks, and clean any dirt deposited on the valve plate and exhaust valve seat. Clean all parts inside the vacuum pump chamber, such as the rotor, vanes, and springs. Generally, use gasoline for cleaning and then dry them. Rubber parts can be wiped dry with a cloth after cleaning. Handle with care during cleaning and assembly to avoid damage. If possible, clean the pipes as well to ensure unobstructed flow.
6. The oil change interval should be determined by the user based on actual usage conditions and whether performance requirements are met. For new vacuum pumps, it is generally recommended to change the oil after approximately 100 hours of operation when pumping clean, dry gas. Once no black metallic powder is visible in the oil, the oil change interval can be appropriately extended.
7. Unscrew the priming plug on the vacuum pump body and fill with priming water (or priming slurry). After reassembly, a trial run should be conducted, generally requiring 2 hours of no-load operation and two oil changes. This is because a certain amount of volatile substances will remain in the vacuum pump during cleaning. Once the pump is running normally, it can be put into normal operation.