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liquid ring vacuum pumps

advantages: disadvantages: suction capacity: How it works:

liquid ring vacuum pump - principle

two-stage liquid ring vacuum pump
two-stage liquid ring vacuum pump, flat sided (axial distribution) (Travaini)

single stage liquid ring vacuum pump
single stage liquid ring vacuum pump, radial distribution (Alstom, Bell,...)

NASH 904
NASH 904 Vacuum Pump.
The NASH 904 replaced the popular NASH CL pump in the 1980's.
This 904 pump can be found in major industries, including Paper, Chemical, and Mining.

double lobe liquid ring vacuum pump
double lobe:
2 complete cycles (inlet, compression, discharge) for each revolution.

 

Manufacturers and suppliers

possible applications of liquid ring pumps

 

how to reach more vacuum?

Use a colder liquid ring, or use a sealant with a lower partial vapour pressure:

 

Higher compression ratio?