liquid ring vacuum pump pumping speed

What is liquid ring vacuum pump

Liquid-ring vacuum pump is also called water-ring vacuum pump. The displacement impeller rotates in the pump cavity to make the chamber volume change periodically to realize the pumping vacuum pump. Its workshop is made up of rotary liquid ring and impeller. Its structure and working principle are similar to that of liquid ring compressor. When working, the suction port is connected with a vacuum container. If the pump cavity is filled with water is called water ring vacuum pump water ring vacuum pump pump structure is simple, easy to manufacture, reliable, easy to use, durable, can pump corrosive, dusty gas and gas-water mixture.

2SK Liquid Ring Vacuum Pump

2SK Liquid Ring Vacuum Pump

Technical Parameter:

Model Suction capacity Ultimate vacuum Power speed Water supply Inlet/outlet diam Water inlet
m³/min MPa(G) KW r/min L/min DN(mm) (mm)
2SK1.5 1.35 -0.097 4 1440 10-15 40 G1/2”
2SK-3 2.7 -0.098 7.5/11 1440 15-20 40 G1/2”
2SK-6 5.4 -0.098 15 1460 25-35 65 G1/2”
2SK-12 10.8 -0.098 22/30 970 40-50 100 G1/2”
2SK-20 18 -0.098 45 740 60-80 125 G3/4”
2SK-30 27 -0.098 55/75 740 70-90 125 G3/4”

Why does the liquid ring vacuum pump reduce pumping speed in high vacuum area?

The application of liquid ring vacuum pumps has been limited because the liquid ring vacuum pump will drastically reduce the pumping speed when the vacuum degree exceeds -0.09Mpa, resulting in a low efficiency to  water ring vacuum pump.

The reason is as follows:

First, increasing water temperature causes too much water vapor in the pump chamber, which cause to cavitation and reduces the ability to pump air.

Second, due to the accuracy of the liquid ring vacuum pump manufacturing process, the remaining gas will be large.


(1)The solution to the problem of cavitation occurring in the high-vacuum state of the liquid ring vacuum pump is to improve the liquid ring vacuum use environment and the external conditions such as circulating water temperature and suction gas temperature as much as possible. Which will help to reduce cavitation.

(2)Regarding the manufacturing accuracy of the liquid ring vacuum pump, this problem is mainly the manufacturer’s design and production ability about accuracy of the liquid ring pump, which is also a test of the production capacity of the liquid ring vacuum pump manufacturer.

Shanghai EVP specialize in the production of liquid ring vacuum pumps, using five-axis machining centers, CNC machine to ensure each component high-precision.

Tags: Liquid ring vacuum pump

Edited by Nancy Zhang / EVP vacuum solution

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