What oil should be added to the vacuum pump of the oil filter?

The choice of the oil filter vacuum pump depends on the type of pump and the working conditions. The following are common situations and oil recommendations:

Rotary vane vacuum pump (most common)

- Recommended oil: special vacuum pump oil (such as ISO-VG68 or VG100 viscosity grade).

- Function: lubrication, sealing and cooling, while maintaining high vacuum.

- Precautions:

- Avoid using ordinary engine oil, because it is easy to oxidize and volatilize, which may damage the pump body or reduce the vacuum.

- Change regularly (usually every 500-2000 hours, depending on the working conditions).

Other types of vacuum pumps

- Water ring vacuum pump: No oiling is required; water is used as the working fluid.

- Screw/vortex type: synthetic oil or grease may be used, please refer to the manual.

3. Special working conditions

- High temperature environment: choose synthetic vacuum pump oil (such as polyalphaolefin), which has better high temperature resistance.

- Chemical gas environment: fluorinated oil or special oil that is resistant to chemical corrosion.

4. General principles

- Viscosity selection: ｓｅｌｅｃｔ high viscosity oil (such as VG100) for high ambient temperature and low viscosity oil (such as VG46) for low temperature.

- Brand reference: Shell, Mobil, Total, etc., all have special oils for vacuum pumps.

5. Operation tips

- Clean the residual oil in the pump before refueling to avoid oil mixing.

- The oil level should be kept in the center line of the window (excessive amount will cause oil spraying, insufficient amount will cause poor lubrication).

- ｒｅｐｌａｃｅ the oil mist separator (if any) at the same time as changing the oil.

Important advice: Check the equipment manual first, or contact the manufacturer to confirm the oil requirements of the specific model. If the working conditions are special (such as the pharmaceutical and food industries), it is necessary to ｓｅｌｅｃｔ pollution-free oil that meets the relevant certifications.