2SK Series Two-Stage Liquid Ring Vacuum Pump
A two-stage liquid ring vacuum pump for continuous duty, covering 1.5–30 m³/min with an ultimate vacuum of −0.098 MPa and motors from 4 to 55 kW.
The 2SK series is a two-stage water ring vacuum pump published for high stability, high reliability, long-term continuous operation and easy maintenance. It is designed to extract air and other gases that contain no solid particles, are non-corrosive and are insoluble in water.
Because two stages are used in series, the pump reaches a higher vacuum and a larger pumping rate in the high-vacuum region than a single-stage water ring pump. The published ultimate vacuum is −0.098 MPa, equivalent to 735 mmHg, with maximum capacities from 1.5 to 30 m³/min and motors from 4 to 55 kW.
The published working vacuum range is −0.03 to −0.08 MPa, and the series is recommended for working conditions where the suction pressure is lower than −0.08 MPa. Typical duties are vacuum evaporation, concentration, reflux, impregnation, drying and smelting in the chemical, pharmaceutical, food, textile, petroleum and metallurgical industries.
| Parameter | Specification |
| Pump type | Two-stage water ring (liquid ring) vacuum pump |
| Max. capacity | 1.5–30 m³/min |
| Capacity at −0.093 MPa suction | 0.9–20 m³/min |
| Ultimate vacuum | −0.098 MPa (735 mmHg) |
| Motor power | 4–55 kW |
| Speed | 740–1460 r/min |
| Water consumption | 10–90 L/min |
| Weight | 200–2300 kg |
| Working vacuum range | −0.03 to −0.08 MPa; suitable where the suction pressure is below −0.08 MPa |
| Gas handled | Air and other gases that are free of solid particles, non-corrosive and insoluble in water |
| Model | Max. capacity (m³/min) | Capacity at −0.093 MPa (m³/min) | Ultimate vacuum | Motor (kW) | Speed (r/min) | Water (L/min) | Weight (kg) |
| 2SK-1.5 | 1.5 | 0.9 | −0.098 MPa (−735 mmHg) | 4 | 1440 | 10~15 | 200 |
| 2SK-3 | 3 | 2 | −0.098 MPa (−735 mmHg) | 7.5 | 1440 | 15~20 | 310 |
| 2SK-6 | 6 | 4 | −0.098 MPa (−735 mmHg) | 15 | 1460 | 25~35 | 460 |
| 2SK-12 | 12 | 8 | −0.098 MPa (−735 mmHg) | 22 | 970 | 40~50 | 730 |
| 2SK-20 | 20 | 14 | −0.098 MPa (−735 mmHg) | 45 | 740 | 60~80 | 1650 |
| 2SK-30 | 30 | 20 | −0.098 MPa (−735 mmHg) | 55 | 740 | 70~90 | 2300 |
Values as published by the manufacturer. The second capacity column is the pumping rate when the suction pressure is −0.093 MPa, which shows how much capacity remains near the top of the vacuum range. Further sizes are available on request.
| Item | Published option |
| Casing and internals | Water ring construction published for high stability and long-term continuous operation; the build is confirmed against the process gas at order stage |
| Ring liquid | Water, consumed at 10–90 L/min depending on size |
| Stage arrangement | Two stages in series, giving a higher vacuum and a larger pumping rate in the high-vacuum region than a single-stage pump |
| Gas compatibility | Air and gases free of solid particles, non-corrosive and insoluble in water |
| Maintenance | Published as easy to maintain, with long-term continuous operation and file building |
| Motor | 4–55 kW, 740–1460 r/min; supply voltage and frequency confirmed at order stage |
| Connection | Inlet and outlet calibers of 40–125 mm across the published range |
- Vacuum evaporation: Provides the vacuum for evaporators in chemical and food processing.
- Vacuum concentration: Concentrates solutions under vacuum in chemical, pharmaceutical and food plants.
- Vacuum reflux: Supports reflux and distillation columns that run under vacuum.
- Vacuum impregnation: Impregnates windings, castings and porous parts in electrical and metallurgical processes.
- Vacuum drying: Dries heat-sensitive products at low temperature in pharmaceutical and food production.
- Vacuum smelting: Serves metallurgical vacuum smelting and degassing processes.
- Textile and paper: Handles vacuum duty in textile finishing and paper making.
- Choose from the capacity at the working pressure rather than the maximum: the published capacity at −0.093 MPa is between 0.9 and 20 m³/min, well below the 1.5–30 m³/min maximum.
- Confirm the working vacuum range of the application sits inside the published −0.03 to −0.08 MPa band, or above the −0.08 MPa suction pressure the series is recommended for.
- Check the water supply against the published consumption, which rises from 10–15 L/min on 2SK-1.5 to 70–90 L/min on 2SK-30, and allow for the water temperature.
- Confirm the gas is free of solid particles, non-corrosive and insoluble in water; the two-stage water ring design is not published for other media.
- Allow for the weight of the larger sizes in the foundation design, since 2SK-20 and 2SK-30 are published at 1650 kg and 2300 kg.
- Check the speed of each size against the drive arrangement, because 2SK-20 and 2SK-30 run at 740 r/min while 2SK-6 runs at 1460 r/min.
What vacuum can a 2SK pump reach?
The published ultimate vacuum is −0.098 MPa, which is 735 mmHg. In practice the pump is applied in the published working vacuum range of −0.03 to −0.08 MPa, and the series is recommended where the suction pressure is below −0.08 MPa.
How do I size a 2SK pump for my process?
Work from the pumping rate at the pressure you actually operate at. For example 2SK-12 gives 12 m³/min at atmospheric conditions but 8 m³/min at a suction pressure of −0.093 MPa, so the duty point has to be taken from the second capacity column.
Why choose a two-stage water ring pump instead of a single-stage one?
The two stages in series give a higher vacuum degree and a larger pumping rate in the high-vacuum region, which is what vacuum drying, impregnation and smelting processes need.
What water consumption should I plan for?
The published consumption ranges from 10–15 L/min on 2SK-1.5 to 70–90 L/min on 2SK-30, and the supply must be continuous while the pump runs.
What is the ultimate vacuum of the 2SK series?
−0.098 MPa, published as 735 mmHg, with a recommended working vacuum range of −0.03 to −0.08 MPa.
What is the capacity range of the 2SK vacuum pump?
Maximum capacity is published from 1.5 to 30 m³/min; at a suction pressure of −0.093 MPa the available capacity is 0.9 to 20 m³/min.
What motor power does the 2SK series use?
From 4 kW on 2SK-1.5 to 55 kW on 2SK-30, at speeds of 740 to 1460 r/min.
What gases can the 2SK pump handle?
Air and other gases that do not contain solid particles, are non-corrosive and are insoluble in water; it is widely used in vacuum evaporation, concentration, impregnation, drying and smelting.
How much water does a 2SK pump consume?
Between 10 and 90 L/min depending on size, published as 10~15 L/min on 2SK-1.5 rising to 70~90 L/min on 2SK-30.
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How to Select a 2SK Water Ring Vacuum Pump
Quick answer: The 2SK is selected from the required ultimate vacuum, pumping capacity and gas composition. It reaches -0.097 to -0.098 MPa with 0.8–120 m³/min capacity and can handle vapour, flammable gases and small amounts of dust and liquid.
Selection Data to Send Our Engineers
- Required ultimate vacuum
- Required pumping capacity
- Gas composition and temperature
- Vapour, flammable or explosive components
- Sealing-water supply and temperature
- Motor voltage and frequency
Industry Applications
Explore how this equipment can be applied in related industrial sectors and review application-specific selection guidance.