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The 2S / 2S(F) Series consists of two-stage liquid ring vacuum pumps designed for industrial applications requiring stable pumping performance at lower inlet pressures. Two liquid-ring pumping stages are arranged in series on a common shaft. Gas is first compressed in the first stage and then transferred to the second stage for further compression before discharge. Compared with conventional single-stage liquid ring pumps, this two-stage arrangement provides improved pumping performance in the higher-vacuum operating range. The pump and motor are mounted on a common base and connected through a coupling, providing stable mechanical support and convenient maintenance. Using water as the standard operating liquid, the 2S / 2S(F) Series is suitable for handling air, wet gases and compatible gas-vapour mixtures in a wide range of industrial process-vacuum applications. Standard 2S models are designed for general industrial service, while 2S(F) models are corrosion-resistant versions developed for compatible chemical and process applications.
Product Specification
Working Principle
The 2S / 2S(F) Series uses two single-acting liquid-ring pumping stages arranged in series on a common shaft. Gas entering the pump is first drawn into the first-stage chamber, where it is compressed by the liquid-ring action. The discharge from the first stage is then transferred through the internal connecting passage to the second stage, where the gas undergoes further compression before being discharged from the pump. This two-stage arrangement reduces the pressure ratio handled by each individual stage and helps maintain more stable pumping performance at lower inlet pressures than a comparable single-stage liquid ring pump. The rotating assembly consists of a common shaft and two impellers, while the two stages are connected through an intermediate section and internal gas passage.
Key Features
Product Gallery
15 photos2S(F) CORROSION-RESISTANT VERSION
2S(F) models are corrosion-resistant versions of the standard 2S Series, developed for compatible chemical and process applications where enhanced material resistance is required.
Full 304 and 316 stainless-steel configurations are available for compatible corrosive process applications. Material selection should be confirmed according to the process medium, concentration, operating-liquid chemistry, temperature and actual operating conditions.
COUPLING-DRIVEN TWO-STAGE DESIGN
The two liquid-ring pumping stages are arranged on a common shaft, while the pump and motor are mounted on a common base and connected through a coupling. This configuration provides stable mechanical support and facilitates installation, alignment and maintenance while maintaining the compact arrangement of the two pumping stages.
*Performance values are based on specified test conditions with air temperature at 20°C, operating-water temperature at 15°C, discharge pressure at 1013 hPa and air relative humidity at 50%. Actual pumping performance and ultimate pressure may vary with operating-liquid temperature and process conditions.
*(F) denotes the corrosion-resistant version. Full stainless-steel configurations are available for compatible process applications.
Typical Applications
Vacuum distillation, evaporation, concentration and process vacuum
Vacuum drying, concentration and compatible process applications
Stable vacuum generation for industrial drying processes
Filtration, dewatering and liquid-removal applications
Vacuum processing requiring stable operation at lower inlet pressures
Backing pump service for Roots vacuum booster systems