3
2.1. Main Features
2. Understanding The Pump
Rotary Vane Vacuum Pumps
1
Vacuum connection
2
Exhaust connection
3
Operating fluid filler screw
4
Operating fluid drain screw
5
Sight glass
6
Motor
7
Gas ballast valve
8
Support stand
9
Casing
35 Casing seal
44 Base plate
48 O-ring
49 O-ring
3/48
1
2
9
4/49
5
44 35 7
8
6
V
2.2. Design
The single stage UNO 005 A/2.5 A and two stage
DUO 2.5 A/AC Rotary Vane Vacuum Pumps are oil-immersed.
The pump stages and motor are mounted on a support stand.
Bearings and pumping chamber are supplied continuously
with pump fluid which both seals and lubricates. Pump fluid,
together with dirt and other particles, is expelled via the
pump valve and returned to the pump fluid reservoir. Foreign
matter and dirt particles are deposited on the floor of the
casing so that only clean pump fluid flows into the pump
circulation system. Intake ports, exhaust ports and gas
ballast valve are located on the support stand. The direct
drive, broad range voltage motor drives the pump via a
coupling. A built-in, thermal protection switch protects the
motor and the pump against overloading.
A hydraulically controlled high vacuum safety valve is
located between the vacuum connection and the pumping
system. The valve closes off the vacuum equipment without
delay when the pump is at a standstill and vents the pump.
The Rotary Vane Vacuum Pumps are in two versions
available:
Standard versions:
UNO 005 A,
UNO/DUO 2.5 A
Version for Corrosive Gas Processes:
DUO 2.5 AC
With regard to the Rotary Vane Pump DUO 2.5 AC please note
the following divergences compared with the standard versi-
on:
- Corrosive gas type pumps are equipped with special
materials.
- Corrosive gas type pumps are equipped with a special gas
ballast valve (see section 4.5)
- Corrosive gas type pumps are operated with the synthetic
pump fluid F5 as standard.
The Rotary Vane Vacuum Pumps are suitable for the generati-
on of rough and medium vacuum in the laboratory and for all
operations where small volume flow rates suffice. They can
also be used as backing pumps for small diffusion or turbo
molecular pumps.
Proper Use
– Rotary Vane Vacuum Pumps may only be used to generate
vacuum.
– Do not pump corrosive or explosive gases (a special versi-
on for these operations is available on request).
– Do not operate the pumps where explosive processes are
involved. This is only permitted with the "explosive" version
of the pump.
– Using accessories not named in this manual is not permit-
ted without authorisation from PFEIFFER.
Improper use will cause any rights regarding liability and
guarantees to be forfeited.
