2BV2 Series Liquid Ring Vacuum Pump

The 2BV2 series is a compact liquid ring vacuum pump in which the impeller runs in a ring of service liquid to move gas and vapour without close metal-to-metal clearances. The published range covers 27–110 m³/h of suction capacity at 2840–2880 r/min, with motor ratings from 0.81 to 3.85 kW.

Suction pressure can be pulled down to 33 mbar, which the manufacturer publishes as a vacuum degree of 97 %. A flexible exhaust port is used in the design to prevent over-compression of the gas being handled, so the pump keeps its efficiency across the working range instead of only at one pressure.

The pump is close-coupled to its motor and is published in IP54 protection, with an IP55 explosion-proof build carrying a d II BT4 grade for flammable and explosive areas. Because the ring is formed by the service liquid, the design tolerates vapour and small amounts of liquid carry-over, which suits packaging, plastics, chemical degassing, food processing and vacuum filtration.

• Packaging lines: Provides vacuum for pick-and-place and packaging equipment.
• Plastics processing: Supplies vacuum to forming, degassing and material-handling equipment.
• Chemical degassing: Removes air, gas and vapour from chemical process vessels and reactors.
• Food processing: Draws vacuum for filling, sealing and processing duties in food plants.
• Vacuum filtration: Pulls liquid through filters and filter presses in chemical and mineral processing.
• Sugar and evaporation: Serves as a high-capacity dehydration and evaporation duty in sugar plants.
• Flammable atmospheres: The Ex build with d II BT4 motors handles explosive gases where the area classification requires it.

1. Size the pump on suction capacity at the working pressure, not at atmospheric conditions: the 2BV2 range is published as 27–110 m³/h, and the capacity falls as the suction pressure approaches 33 mbar.
2. Confirm the service-liquid supply. The published consumption is 2–4.2 L/min, and both the flow and its temperature set the vacuum actually achieved.
3. If the pump runs for long periods below 80 mbar suction pressure, the manufacturer states that a cavitation protection tube should be connected.
4. Select the Ex build with d II BT4 motors and IP55 protection when the installation area is classified for flammable or explosive gas.
5. Check the noise figure against the room: the published values rise from 62 dB on the smallest model to 72 dB on 2BV2 071.
6. State the gas composition and any condensable vapour, because corrosion resistance and the sealing arrangement are confirmed against the medium at order stage.