The  PVL 401 and PVL 541 are single-stage, rotary vane lubricated pumps with oil recirculation.
The flanged electric motor is connected by means of an elastic coupling.
Cooling is ensured by an air/oil heat exchanger and with a centrifugal fan.
An integrated check valve prevents the oil from coming back and the return of air into the chamber to be pumped down during the stop phase.
The oil tank is provided with a system for separating the oil mists from the exhaust air; the separated oil is automatically recovered from the pump.
The gas ballasts prevent condensation inside the pump when small quantities of steam are sucked.

The PVL 401 and PVL 541 pumps are suitable for the evacuation of closed systems or to operate at a constant vacuum included in the following range:

PVL 401 – PVL 541 from 0,5 to 300 mbar (absolute)

PVL 401 B – PVL 541 B from 10 to 850 mbar (absolute)

ACCESSORIES

The following accessories are useful for the installation and for the control of the pump operation parameters:

•   External suction filter
•   Vacuum gauges / vacuostats
•   Pressure gauges / pressure switches
•   Thermostat
•   Minimum oil level switch