# The principle of vacuum pump and use

1, the limit of the vacuum pump pressure
The ultimate pressure of the vacuum pump unit is PA, refers to the pump at the entrance is equipped with standard test cover and work conditions by the regulation, without introducing gas under the condition of normal work, the minimum pressure tends to stable.

2, the pumping capacity of vacuum pump
The pumping speed of vacuum pump unit is the m³/s  or L/S, is refers to the vacuum pump is equipped with standard test, and according to the requirements specified in the work, from the test cover through the flow of gas and location specified in the test to cover the balance of the measured pressure.Hereinafter referred to as the pumping speed of the pump.

3, Throughput of a vacuum pump
The vacuum pump unit is a containment PA m³/s or PA L/S.Refers to the pump inlet gas flow.

4, The starting pressure of vacuum pump
Starting pressure of vacuum pump unit for PA, it refers to the vacuum pump no damage when starting with extraction effect of the pressure.

5, The fore pressure of the vacuum pump
Front-end pressure of vacuum pump unit is a PA, it refers to the exhaust pressure is lower than the export of an atmospheric pressure of the vacuum pump pressure.

6, The biggest fore pressure of the vacuum pump
Vacuum pump mouth level before the biggest pressure unit is PA, it is more than the level can make the pump damaged before the pressure.

7, vacuum pump’s maximum working pressure
Vacuum pump unit is the maximum working pressure of PA, it refers to the inlet pressure corresponding to maximum swept volume.Under the pressure, pump can work continuously without deterioration or damage.

8, compression ratio
Compression ratio refers to the export pump for a given gas pressure and the ratio of the inlet pressure.

9, the coefficient of the ho
Pump suction channel area actual pumping speed and its calculated on molecular effusion theory is the ratio of the pumping speed.

10, pumping speed coefficient
Actual pumping speed of pump and pump at the entrance by the ratio of the pumping speed of theory for the calculation of molecular effusion.

11, reflux ratio,
Reflux ratio of pump unit is G/CM2. S.It refers to the pump work, under specific conditions through the quality of pump suction pump flow per unit area ,The flow ratee

12, water vapor allowances
Water vapor allowances unit is KG/H, it refers to the pump in the normal environment conditions, the gas ballast pump in continuous work to ejector steam mass flow rate.

13, the maximum allowable steam inlet pressure
The maximum permissible steam inlet pressure unit is the PA.It is to point to in the normal environment conditions, gas ballast pump in continuous work to the highest inlet pressure of water vapor ejector.

Vacuum pump are mainly include liquid ring vacuum pump , rotary vane vacuum pump , rotary piston vacuum pump , roots vacuum pump , dry scroll vacuum pump , metal oil diffusion vacuum pump , molecular vacuum pump , vacuum system and so on .

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