1. Limit pressure of vacuum pump

Limit pressure is also known as limit vacuum, the unit is PA, refers to the pump at the inlet equipped with a standard test cover and according to the specified conditions, in the normal operation without introducing gas, tends to be the lowest stable pressure, that is, the lowest stable pressure that can be achieved after the vacuum pump inlet end is fully pumped.

2. Pumping rate of vacuum pump

The pumping rate unit is m3 / s or L / s, which refers to the ratio of the gas flow from the test cover to the balance pressure measured at the specified position of the test cover when the pump is equipped with a standard test cover and works under the specified conditions. In short, it refers to the volume of gas that can be pumped out of the vacuum pump in unit time, which is one of the important performance indexes of vacuum pump, referred to as pumping speed.

3. Pumping capacity of vacuum pump

The pumping volume unit of vacuum pump is pa m3 / s or PA L / s. Refers to the gas flow at the pump inlet.

4. Starting pressure of vacuum pump

The starting pressure unit of vacuum pump is PA, which refers to the pressure when the pump starts without damage and has the function of pumping.

5. Front stage pressure of pump

The pressure unit of vacuum pump is PA, which refers to the outlet pressure of vacuum pump whose exhaust pressure is lower than one atmospheric pressure.

6. Maximum pre stage pressure of vacuum pump

The maximum pressure unit of vacuum pump port is PA, which means that it exceeds the pressure of the front stage which can damage the pump.

7. Maximum working pressure of vacuum pump

The maximum working pressure unit of vacuum pump is PA, which refers to the inlet pressure corresponding to the maximum pumping volume. Under this pressure, the pump can work continuously without deterioration or damage.

8. Compression ratio

Compression ratio refers to the ratio of pump outlet pressure to inlet pressure for a given gas.

9. He's coefficient

The ratio of the actual pumping speed on the pumping channel area to the theoretical pumping speed calculated according to molecular effusion.

10. Pumping speed coefficient

The ratio between the actual pumping speed of the pump and the theoretical pumping speed calculated according to the molecular flow at the pump inlet.

11. Reflux rate

The unit of return flow rate of the pump is g / cm2. S. It refers to the mass flow rate of pump flow per unit area through the pump inlet when the pump works under specified conditions.

12. Water vapor allowance

The allowable unit of water vapor is kg / h, which refers to the mass flow of water vapor that can be extracted by gas ballast pump in continuous operation under normal environmental conditions.

13. Maximum allowable steam inlet pressure

The maximum allowable water vapor inlet pressure unit is PA. It refers to the maximum inlet pressure of water vapor that can be extracted by gas ballast pump in continuous operation under normal environmental conditions.