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SZ series water ring vacuum pumps and compressors are used to pump and compress air and other non corrosive, insoluble in water, not containing solid particles of gas, in order to form a vacuum and pressure in a closed vessel. But a small amount of fluid is allowed to be mixed with the gas. It is widely used in machinery, petrochemical, pharmaceutical, food, sugar and electronic industry. In the process of the work, the gas compression is isothermal, so in the compression and pumping flammable, explosive gas, is not easy to occur. So its application is more extensive.