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How to select vacuum pump---Small Water Vacuum Pump or Oil Sealed Vacuum Pumps?



According to the scope of use and pumping efficiency, vacuum pump can be divided into three types:

General small water vacuum pump , known as rough vacuum pump whose pressure can reach to 1.333~100kPa(10~760mmHg)

The oil sealed vacuum pumps , also known as second highest vacuum pump whose pressure can reach 0.133~133.3Pa(0.001~1mmHg).

Diffusion pump, known as high vacuum, whose pressure is up to 0.133Pa (10-3mmHg).

If lower pressure is needed, it is necessary to use oil sealed vacuum pump . A good oil sealed vacuum pump can be pumped 133.3Pa (1mmHg) below.

Small water vacuum pump s and vacuum pumps are commonly used in organic chemistry lab oratories. Water vacuum pump principle is similar to the oil sealed vacuum pump. Pumps can be used if low pressure is not required. If the pump is well constructed and the pressure is high, the pump-down efficiency can reach 1067 ~ 3333Pa (8 ~ 25mmHg). The lowest pressure the pump can draw is theoretically equivalent to the water vapor pressure at the time of the water temperature. For example, the water vapor pressure is 3192, 2394, 1197 Pa (8-25 mmHg) when the water temperature is 25 ° C, 20 ° C and 10 ° C, respectively. Pumping with water pump, safety pump should be installed in front of the pump to prevent the pressure drop, the water flow suction; stop pumping before, you should deflate, and then turn off the p ...

News Release: How to select vacuum pump---Small Water Vacuum Pump or Oil Sealed Vacuum Pumps?
Submitted on: December 15, 2017 09:19:59 AM
Submitted by: chillerpump
On behalf of: www.rotovap.cn/working-principle/how-to-select-vacuum-pump-80.html
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