Selection range and principle of vacuum pump oil viscosity?

The quality of vacuum pump oil depends on the viscosity and vacuum degree, and the vacuum degree depends on the numerical value under different temperature conditions. The higher the temperature, the more stable the performance of vacuum degree is the good oil.
I. Viscosity Range of Vacuum Pump Oil in Common Use
1. Piston vacuum pump (W-type) can use general oil, using V100, V150 viscosity grade oil.
2. Rotary vane vacuum pump (2X type) uses V68 and V100 viscosity grade oil.
3. Direct connection (high speed) rotary vane vacuum pump (2XZ type) uses V46 and V68 viscosity grade oil.
4. Sliding valve vacuum pump (H type) uses V68 and V100 viscous grade oil.
5. Yucycloid vacuum pumps (YZ, YZR) use V100, V150 viscosity grade oil.
6. For lubrication of gear transmission system of Roots vacuum pump (mechanical booster pump), V32 and V46 vacuum pump oil can be selected.
II. Viscosity Selection Principle
The choice of oil viscosity is one of the important factors for the performance of vacuum pumps. Therefore, the selection of oil viscosity by various vacuum pumps is very important. The principle of oil viscosity selection is as follows:
1. The higher the speed of the pump, the lower the viscosity of the selected oil.
2. The greater the linear velocity of the pump rotor, the lower the viscosity of the selected oil.
3. The more precise the processing accuracy of pump parts or the smaller the gap between friction parts, the lower the viscosity of selected oil products.
4. When vacuum pump is used at high temperature, it is better to choose the viscosity of oil.
5. Vacuum pumps with cooling water circulation should generally choose oils with lower viscosity.
7. Other types of vacuum pumps can select corresponding oils according to their rotational speed, processing accuracy and ultimate vacuum.
The viscosity of liquids is the resistance of the flow of liquids, or the internal friction of liquids. The greater the viscosity, the greater the resistance of the moving speed of various components, the higher the temperature rise, and the greater the power loss; the smaller the viscosity, the worse the sealing performance of the pump, resulting in gas leakage and vacuum deterioration.

PVD coating machine pump
Milking machice pump
CNC machine pump
Vacuum adsorption pump