Commonly Used Vacuum Pump Pressure and Application

There are many types of vacuum pumps, and how to select the vacuum pump is a problem that needs to be solved in the design work. Understanding the vacuum degree and application of commonly used vacuum pumps can help the selection of vacuum pumps.


  1. Liquid ring pump is a kind of rough vacuum pump.

The gas compression in the liquid ring pump is isothermal, so it can be used to pump flammable and explosive gases, and it can also be used to pump dusty and water-containing gases. Limited by the saturated vapor pressure of the working fluid, the vacuum degree is low. If using water as the working fluid, the ultimate vacuum is 2000~4000Pa, if using oil as the working fluid, the ultimate vacuum is about 130Pa.


  1. The rotary vane pump is an oil-sealed mechanical vacuum pump.

It can start pumping directly from atmospheric pressure. It can be used as a low vacuum pump alone, or as a backing pump together with other high vacuum pumps. It is small in size, light in weight, and low in noise, especially suitable for laboratory use. The pump cannot be used for pumping gas with high oxygen content, toxic, explosive or chemical interaction with pump oil or corrosive effect on ferrous metals. It’s ultimate vacuum ≤1.3Pa.


  1. Roots pump is a variable volume vacuum pump.


Quick start-up

Low power consumption

Low operation and maintenance costs,

High pumping speed

High efficiency

Insensitive to a small amount of water vapor and dust in the pumped gas

Larger pumping rate in the pressure range of 100 to 1Pa, which can quickly remove the suddenly released gas without oil lubrication.

The speed can be as high as 3450 ~ 4100r/min, the pumping rate is 30 ~ 10000L/s.

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