A liquid ring vacuum pump compresses gas using an auxiliary liquid (normally water) as a liquid compressant, as sealing liquid and cooling liquid.

T H E   4   F U N C T I O N S   O F   T H E   L I Q U I D   R I N G 

P I S T O N 

the liquid ring segment between two blades is acting like a piston causing intake, compression and discharge.

S E A L I N G 

between blades and body (no metal-metal contact)
and between suction and discharge ports (avoiding a by-pass).

C O O L I N G 

evacuate the specific heat of the gas, the heat of compression and of condensation.

C O N D E N S I N G 

the suction capacity is increased by condensing a portion of the vapour at the inlet.