Oil Sealed Rotary Vane Vacuum Pump Can Not Reach Ultimate Pressure

Anti Return Valve Failure

Most oil-sealed rotary vane pumps are equipped with an anti-return valve. If the anti-return valve is deformed or stuck, it may cause the pump port to be blocked, so that the pump cannot reach ultimate pressure.

Troubleshooting: Check the anti-return valve of the air inlet, clean or repair it.

 

Exhaust Valve Failure

The exhaust valve of the pump casing is damaged or there are impurities between the pump casing and the exhaust port, and the exhaust port is not tightly sealed.

Troubleshooting: Replace or clean the exhaust valve.

 

Inappropriate Pump Oil

Each pump model has a corresponding vacuum pump oil. Each pump has its own required clearance during production. It is necessary to use a vacuum pump oil with a matching viscosity, so as to achieve the ultimate vacuum degree. If we use pumps with different viscosity, it may cause the vacuum degree not meeting the factory requirements.

Troubleshooting: Ensure that the pump oil is in good working condition, and change the oil (degas the oil if necessary).

 

Air Intake Is Contaminated

When the air inlet or the suction pipe of the vacuum pump is seriously polluted, the pollutants will affect the pumping speed and flow conductance, thus affecting the ultimate vacuum degree.

Troubleshooting: clean the exhaust pipe.

Cleaning of the suction pipe: clean it with a suitable solvent and make it dry to prevent the solvent from being sucked into the pump cavity and causing the pump oil to be polluted.

 

Pump Speed Is Too Low

If possible, measure the ultimate vacuum of the vacuum pump separately to confirm whether the performance of the vacuum pump meets the requirements. In addition, we can also calculate the evacuation time according to the requirements to confirm whether the pumping speed of the selected vacuum pump is too low.

Troubleshooting: Confirm the system parameters, and replace the pump if necessary.

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