What are the different types of liquid ring vacuum pumps?

There are two main types of liquid ring vacuum pumps. They include single and double stage vacuum pumps.
Now its structure has been greatly improved, they developed a new hybrid vacuum pump. They also have a liquid ring vacuum pump called a solvent seal ring pump.
Liquid ring systems may be single - stage or multi - stage. Typically, multistage pumps will have up to two compression stages on a common shaft. In vacuum service, the pressure reduction to be achieved is limited by the annulus vapor pressure.
Single stage vacuum pump usually produce 35 Joe (mm Hg) or 0.047 the vacuum, the two stage pump can produce vacuum to 25, assuming that the air is pumped, liquid ring is 15 ° C (60 °) less water. Dry air and 15 ° C sealant - water temperature is the standard performance, most of the manufacturers to use its performance curve.

Liquid ring vacuum pumps can use any liquid compatible with the process as long as it has appropriate vapor pressure characteristics as a sealant liquid. Although the most common sealant is water, almost any liquid can be used. The second most common is oil. Because the oil has very low steam pressure, the oil seal liquid ring vacuum pump is usually air-cooled.
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