Operating and maintenance instructions
EN
4
LI 3019.03
2. Product specifications
2.1 Pump description
The pumps series PVL 401 - PVL 541 have a nominal capacity (50 Hz) of 403 and 536
m3/h respectively.
They are lubricated, with oil recirculation system, rotary vane vacuum pumps.
The flanged electric motor is coupled by means of an elastic coupling.
The cooling is made by means an air/oil cooler, cooled with a centrifugal fan.
At the inlet there is a mesh filter in order to protect the pump from solid parts having
diameter bigger than 1,5 mm.
Furthermore, an integrated no-return valve prevents the oil from coming back and the
return of air in the chamber to be pumped down during the stop phase.
In the tank there is a system of separation of oil smokes from discharge air (maximum
residual 2PPM/weight corresponding to 2.4 mg/m3 ).
The separated oil is recovered automatically by the pump.
A gas ballast valve, always on, prevents condensation inside the pump when pumping
down small quantity of vapour.