ELMO RIETSCHLE – LIQUID RING – 2BV & 2BE

The Liquid Ring Principle

The working principle of a liquid ring pump is based on a round pump body and an eccentric rotor: As the rotor spins, the seal liquid inside the pump forms a rotating liquid ring on the inner surface of the body, forming the “liquid ring.” With every rotation of the rotor, the chambers between the rotor blades plunges into and out of the liquid ring: on the suction side, the volume of the rotor chamber increases and gas streams in through the suction port. As the rotor spins past the inlet port, the chambers between the rotor blades fill up with a volume of gas. The gas is compressed inside the chambers – with the liquid ring acting like pistons while the rotor chambers act like cylinders. When each chamber reaches the discharge port opening, the compressed gas escapes into the discharge port.

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Technical Advantages - 2BV Series

Elmo Rietschle 2BV vacuum pumps are suitable for evacuating gases and wet vapors down to inlet pressures of 33 mbar(A) ( 97% vacuum ). All these vacuum pumps are supplied with built-in cavitation protection. For long-term operation below 80 mbar(A) the cavitation protection should be connected for protecting the pump. An inlet pressure of 10 mbar(A) can be achieved by connecting a gas ejector. The gas ejector can be mounted directly onto the vacuum pump.

Monoblock Design
• Easy to install
• Small footprint
• Easy maintenance

Unique flexible exhaust port design
• Achieving optimal work efficiency

100% Oil-free Design
• Environmentally friendly
• Improve efficiency

Self priming function
• Operating friendly

Bronze impeller – The only rotating component
• Available in stainless steel
• Enhanced corrosion and erosion resistance
• No wear
• Long service life
• No maintenance required

Mechanical seal
• Prevent leakage
• Reduce maintenance costs

Less noise
• Smooth operation
• Reduce operating costs
• Secure communication environment

Performance
• Inlet Pressure: 33mbar(A)
• An inlet pressure of 10 mbar(A) can be achieved by connecting a gas ejector.
• 2,600 mbar(A) can be achieved by used as a compressor

Specification - 2BV

Elmo Rietschle 2BV vacuum pumps consists of 2BV5 and 2BV6 series.

The 2BV5 series are especially space saving units in monoblock design (degree of protection IP55).

The 2BV6 range is in close-coupled design with drive motor.

The block pumps of the 2BV series are characterized by a very high suction volume of up to 600 mД/h with suction pressures of up to 33 mbar abs. and are primarily used for applications with large quantities of liquids. The sound pressure level remains under 73 dB(A) and therefore fulfils even the strictest noise stipulations. The compact construction reduces the space required for the installation of the pumps compared to conventional machines.

Technical Advantages - 2BE Series

Elmo Riestchle is the inventor of the liquid ring pump and hold the first patents of this technology. Over more than 100 years, we have constantly developed and improved these pumps.

Gases handled
Beside air, ER liquid ring pumps are able to handle a lot of different gases: gasoline vapor, sulfur dioxide, chlorine, hydrogen sulfide, or vinyl chloride
monomers, just to mention a few.

Operating liquids
Depending on the process and the gas handled, a seal liquid other than water may be needed. Many liquids can be used as a seal, including acetic acid, acetone, glycol, xylene and many other chemicals

Field of application
Due to the compression inside the pump, the gases handled may condense.
In contrast to other technologies, this additional wetness is no problem for liquid ring pumps. Some important – but not only – fields of application are
processes that handle wet, aggressive and explosive media, fluids and gases.

• Almost isothermal compression
• No metal-to-metal contact of components
• Only one moving part
• No internal lubrication necessary
• Accepts liquid carryover
• Pulsation free conveyance
• Non-sensitive to wetness and condensation
• Long service life and reliability

Specification - 2BE Series

Large Series                       Small Series

• Vacuum Range: to 33 mbar abs. (to 1 in HgA)
• Suction Pressure: to 1,200 mbar abs. (to 17.4 psi)
• Maximum Discharge Pressure: 3.5 bar abs. (36 psig)
• Differential Pressure: to 2.6 bar (to 38 psi)
• Shaft Sealing (for small series): Single acting Mechanical Seal (standard), Stuffing box, double acting Mechanical Seal on request
• Shaft Sealing(for large series): Stuffing box (standard), Mechanical Seals (single acting / double acting) on request
• Materials: Cast Iron, Stainless Steel, Combination of both materials