10
ELRO
®
Pumps for hazardous materials GUP 3-1,5 and GP 20/10Ex
The sliding tube of the rotor enlarges the
volume of the suction area (4). At the same
time the pressure area (7) is decreased and
the air is forced out through a channel in the
pump cover.
The rotor (1, Fig. 5) rotates inside the
separating part (3, Fig. 5), which is tightly
bolted to the housing. This separates the
suction area (4, Fig. 5) from the inside of the
pump (5, Fig. 5).
The separating part 3 (Fig. 3 and 5)
separates the suction area (4, Abb. 4)
from the inside of the pump (5, Fig. 4) and
protects the pumping hose. In case of hose
breakage it additionally protects the rotor (1,
Fig. 4) against damage caused by abrasive
or coarse particle product. The separating
part can be replaced by simply unscrewing
two screws.
The pump is filled with 1 litre of sliding fluid
(glycerine or silicone), which works as
lubricant, barrier and coolant.
The vacuum gauge connected with the
suction area (4, Fig. 4) not only shows the
present suction lift of the pump, but has the
additional function of a warning instrument
for possible defects. If the vacuum gauge
does not indicate a vacuum during
operation, the pump needs to be serviced
urgently.
This maintenance can be carried out without
any special tools.
Fig.5
Fig. 6
7
5
4
6
1
3
4
7
7
6
7
5
4
6
1
3
4
7
7
6
1 Rotor
3
Separating belt
4
Suction area
5
Inside of housing
6
Hose chamber
7
Pressure area
4
Suction area
7
Pressure area
Fig. 4 Vacuum gauge
