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1. Vapor allowance of vacuum pump:

The allowable unit of steam is kg / h, which refers to the mass flow of steam that can be extracted by gas ballast pump in successive operation under abnormal conditions.

2. Pumping rate of vacuum pump:

The pumping rate unit of the pump is m3 / s or L / s, which refers to the ratio of the gas flow from the test cover to the maladjusted pressure measured at the designated position of the test hood when the pump is equipped with a standard test cover and operates according to the specified conditions. Referred to as the pumping speed of the pump.

3. Limit pressure of vacuum pump:

The ultimate pressure unit of the pump is PA, which means that the pump is equipped with standard test cover at the outlet and operates according to the regulation conditions, without introducing abnormal operation of gas, the trend is stable.

4. Return flow rate of vacuum pump:

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 at the pump outlet when the pump operates according to regulations.

5. Pumping speed coefficient of vacuum pump:

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