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PVI Liquid Ring Vacuum Pump

PVI Liquid Ring Vacuum Pump

The liquid ring vacuum pump series PVI are the latest technology of rotary liquid ring mechanism with curved impeller vanes and port plates with valves. They are mainly used to generate vacuum in different industries.



• Vacuum generation in condensation, evaporation and filtration systems in sugary industry

• Central vacuum system in hospitals

• Vacuum filtration, floatation and concentration in steel industry

• De-aeration of water pumps with low NPSH in water/waste water industries

• Distillation of products, filtration, replacing steam ejectors, vacuum generation, vapor recovery and de-aeration in different processes in oil, gas and petrochemical industry

• Vacuum condensation and de-watering in power plant


• New generation with latest technology of the its type

• Increased efficiency regarding water and power consumption compared to older models

• No need for oil lubrication

• Port plates with valves for double action

• Conveyance of air/gas and liquids simultaneously

• Oil-free outlet gas/liquid

• Very low vibration and noise emission

• Creating vacuum up to 0.01 mbar a (in combination with rotary vane type vacuum pump)

• Free air delivery measured based on PNEUROP 6612

• Heavy duty and non-stop operation

• Varity of mechanical seal installments such as double and single seals in component or cartridge design

• No contact between pump moving and stationary parts thus increasing efficiency and lifetime

Product Code


XXXX: capacity from 40 to 5000 m3/hr

YY – main parts material

00: cast iron for all parts

01: SS 304 impeller with cast iron for other parts

22: SS 316 for all parts

V stands for vacuum

For more information, please refer to the product catalogue

Performance range

• Capacity from 40 to 5000 m3/hr

• Vacuum pressure up to 33 mbar a

• Power consumption from 1.5 to 132 kW

• Inlet/outlet flange sizes from 1 to 8 inches


Design and Operating Mechanism

Design and operating mechanism

Design and Construction

The PVI liquid ring vacuum pumps are constructed of two main parts: rotor (shaft and impeller) and casing (cylinder and cylinder head), which in spite of their simple mechanisms offer high quality of performance.

The material used in the pumps is of high quality and the parts are manufactured under the ISO and DIN standards with accepted tolerances of 100th of a millimeter. This accuracy leads to minimum internal leakage and maximum pump efficiency. Pumps’ rotors are dynamically balanced with computerized devices which lead to very low dynamic vibrations.

Operating Mechanism

The vaned impeller rotates around the pump axis of rotation in an eccentric fashion. The liquid (usually water) is fed into the pump cylinder and, by centrifugal acceleration, forms a moving cylindrical ring against the casing.

The liquid ring creates seals between impeller vanes and the two sides of the cylinder. The eccentric rotation of the impeller causes cyclic variations of the volume enclosed by the impeller vanes and the ring. Air or gas/vapor is input to the pump via the inlet port. It is trapped in the compression chambers formed between the vanes and the liquid ring. Due to the reduction in the volume of these compression chambers which is a result of the eccentric rotation of the impeller, air or gas/vapor is compressed and discharged through the outlet port of the pump.

Cooling of the pump is done by the liquid (normally water). A fresh supply of liquid can be fed into the pump continuously or it can be cooled after discharge and fed back into the pump. The former method is more environment-friendly since there is no waste of liquid (closed-loop).



PVI liquid ring vacuum pumps are offered in the following models:

Overhung on motor shaft

Vacuum Up to 33 mbar a
Capacity 40 to 210 m3/hr
Power 1.5 to 5.5 kW

Overhung on Separate Bearing Housing

Vacuum Up to 33 mbar a
Capacity 280 to 380 m3/hr
Power 7.5 to 11 kW

Between bearing design

Vacuum Up to 33 mbar a
Capacity 500 to 1600 m3/hr
Power 15 to 75 kW

Between bearing design/ Replaceable with ELMO SIEMENS 2BE Series

Vacuum Up to 60 mbar a
Capacity 3000 to 5000 m3/hr
Power 75 to 132 kW


 Pars Vacuum Industries General Catalogue

کاتالوگ پمپ دورانی رینگ مایع

Pars Vacuum Industries Liquid Ring Pumps Catalogue

کاتالوگ محصولات واکیوم پارس