Number of stages:
The blowers are made of cast iron with rotors in carbon steel or in spheroidal cast iron depending on the size. These materials assure good performancce in standard operating conditions with gases or vapours.
The RPP series vacuum blowers are made of two conjugate rotors which rotate inside a special design casting with very tight clearances in all positions assuring gas sealing without contact between parts. The rotors are synchronized by high precision helical gears which allow high speed.