liquid ring vacuum pumps
- tolerate entrained liquids and solids
- isothermal compression (for monomer recovery, explosive gases)
- very safe for explosive gases
- simple design for corrosion resistant materials
- high power absorbed
- process fluid and auxiliary fluid are mixed-up / contaminated
How it works:
- 10m³/h to 30.000m³/h
- vacuum: down to 30 mbarA
two-stage liquid ring vacuum pump, flat sided (axial distribution) (Travaini)
single stage liquid ring vacuum pump, radial distribution (Alstom, Bell,...)
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.
2 complete cycles (inlet, compression, discharge) for each revolution.
FAQ's - liquid ring vacuum pumps
liquid ring vacuum pumps manufacturers
how to reach more vacuum?
Use a colder liquid ring, or use a sealant with a lower partial vapour pressure:
- Using water at 15°C as sealant (Partial Vapour Pressure = 17 mbar), the end vacuum will be around 25 mbar.
- With water at 35°C (PVP = 57 mbar), the end vacuum will be around 70 mbar.
- With ethylenglykol at 80°C (PVP=1 mbar), the end vacuum will be around 10 mbar.
Higher compression ratio?
- For example if discharge pressure higher than atm. pressure.
- increase tip speed, increase speed of rotation
- use a double lobe pump, the ring will be more stable
- use a two-stage pump, for less shaft deflection