Products > Special pumps >  TRAVAINI Italy, liquid ring vacuum pumps

1 Shaft
2 Air inlet
3 Blade
4 Impeller
5 Liquid ring
6 Air outlet

The shaft is eccentrically fitted inside the pump's body. It is neccessry to feed the pump with service liquid (usually water). While the pump is rotating and due to the centrifugal force, the service liquid forms a liquid ring, concentric with the pump's body. Incomming air is trapped within the impeller's blades and the liquid ring. Air is gradually compressed and is finally expelled towards the pump's outlet.

Due to the compression of th air, the temparature of the service liquid is gragually increasing. It is neccessary to supply the pump with new fresh service liquid or in case of total recirculation to effectively cool the service liquid.

Liquid ring vacuum pumps can suck any kind of gas, providing that this is chemically compatible with pump's materials and that does not react with the service liquid. They are used in central vacuum units in hospitals, in pharmaceutical factories, in slaughter houses, in tobacco drying ovens, in textile industries and wherever vacuum creation is required.

TRM in close-coupled version
Single stage, in close coupled version. Simple and robust construction. Smooth and noiseless running.

SPECIFICATIONS
• Max capacity 280 m3/h
• Final pressure 33 mbar
• Bore 1" to 2"
• Power 1 to 10HP
MATERIALS
• Pump body in cast iron
• Impeller in bronze or in stainless steel AISI304
• Shaft in AISI420
• Mechanical seal
• Also available in AISI316 version
MOTOR DATA
• TEFC motor
• 2 pole in 25,32 and 4 pole 40,50
• Voltage 3~ 400V/50HZ or 3~ 440V/60HZ

TRH, TRS  in bare shaft version

Double stage (TRH) or single stage (TRS). Wide range series.
Heavu duty construction for industrial and marine use.
SPECIFICATIONS
• Max capacity 3500 m3/h
• Final pressure 33 - 900 mbar
• Bore 1" to 8"
• Power 1 to 150HP
ΥMATERIALS
• Pump body in cast iron
• Impeller in stainless steel AISI304
• Shaft in AISI420
• Mechanical seal
• Other materials on demand

MARCO PUMPS supplies also all TRH, TRS pumps as complete units with 3~ 400V/50HZ or 3~ 440V/60HZ electric motors

Calculation of required capacity 

A formula for the required pump capacity is :

      2,3 V x 60            P1
S = ------------  log10 ----, where :
              T                 P2

S= Required capacity, in m3/h
V= Volume to be evacuated, in m3
Τ= Time required to reach the final vacuum, in minutes
P1= Initial pressure in Torr
P2= Required final pressure in Torr