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In addition to being able to draw in ordinary gases, the water ring vacuum pump has the main advantage of being capable of drawing in condensable gases (such as water vapor). Due to the isothermal compression characteristic of the liquid ring pump, it can also draw in flammable, explosive, and corrosive gases. Liquid ring pumps are widely used in industries such as chemicals, light industry, food, pharmaceuticals, papermaking, and electrical engineering. Selection of liquid-water ring vacuum pumps: 1. Depending on the required level of vacuum, the following options are available: ● For long-term operation in the range of 1.3×104~1×105 Pa (100～760 Torr), a single-stage SK-type water ring vacuum pump should be used. ●For long-term operation in the range of 5×103~1.3×104 Pa (40～100 Torr), a two-stage 2YK type water ring vacuum pump is recommended. ●For long-term operation in the range of 1×103~1.3×104 Pa (8～40 Torr), a 2YK type two-stage oil ring vacuum pump is recommended. 2. The working medium can be selected as follows: ● Normal temperature water, with ≤15°C being the optimal temperature; it should generally not exceed 40°C. ● Transformer oil or other industrial oils with low viscosity and low saturated vapor pressure, with a maximum operating temperature of 60°C. Such as vacuum drying in the electrical industry. ●Chemical liquids: these are liquids that use raw chemical materials directly and require a low saturated vapor pressure, such as ethylene amine. ●Except for normal temperature water, when other working media are used, gas-liquid separators, coolers, etc. should be installed, and mechanical seals should be used for the dynamic sealing of the pump shaft. For detailed performance parameters, see the performance table. 3. Selection of shaft dynamic seal: ● For general applications, a packing seal can be used. ●Mechanical seals should be used in applications that require leak-free operation. 4. Material selection for components subject to overcurrent: ● Except for the shaft, all other components are made of cast iron or copper alloys, making them suitable for pumping non-corrosive gases. ●304 and 316 stainless steel. Suitable for pumping gases with certain corrosiveness. ●Engineering plastics, suitable for pumping acidic and corrosive gases. 5. If it is necessary to transport gas while evacuating, and the pressure at the exhaust port exceeds atmospheric pressure, the following options can be considered: ● If the pressure at the exhaust port is greater than 0.15 MPa, a modified vacuum pump should not be used; instead, a dedicated two-stage liquid ring compressor should be selected. The power of the accompanying motor should be increased, and a dedicated gas-liquid separator as well as an automatic drainage system should be provided. ●If the pressure at the exhaust port is higher than atmospheric pressure but lower than 0.15 MPa, it can be modified from a vacuum pump to be used as a liquid ring compressor. 6. System configuration type ● An open-loop circulation system is used when the working fluid at the discharge outlet is not reused or only partially reused. ●When the working fluid from the discharge port must be reused and not discharged outside, a closed-loop circulation system should be employed.