Rotary Vane Vacuum Pump Technical Parameters

The performance parameters of the rotary vane pump include ultimate pressure, suction capacity, power, temperature rise, vibration, noise, and working life.

The most important specification is pump ultimate pressure, suction capacity, and the motor power.


  1. Ultimate pressure: the lowest stable pressure obtained by the pump, measurement unit is Pa, which is related to the following factors

  • Vacuum gauge type that is used when measuring pressure.

  • Pump oil circulation.

  • Pump oil working temperature: the higher the oil temperature, the higher the saturated vapor pressure of the oil, and the lower the ultimate vacuum of the pump.

  • It is related to the harmful space between the contact point of the pump cavity and the exhaust port. The gas in the harmful space cannot be discharged from the pump cavity by the rotary vane pump, but will be brought back to the suction side, resulting in an increase in the ultimate pressure. The circulating oil in the pump is filled into the harmful space, which can eliminate the influence of the harmful space on the ultimate pressure.

  • Machining accuracy of parts, gaps between moving parts, shaft end seals, etc.


  1. Pumping speed: the volume of exhaust gas per unit time, the measurement unit is L/S.

  • Nominal pumping speed: the pumping speed of the rotary vane pump on the nameplate.

  • Geometric pumping speed: The geometric volume discharged per unit time of the rotary vane pump at the rated speed is related to the volume of the suction chamber at the end of suction, the speed of the rotor, and the number of suction and discharge times in one revolution.

  • Actual pumping speed: The actual measured pumping speed is a function of inlet pressure.


  1. Motor power: It’s related to compressed gas, overcoming friction and overload.

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