3 Product description
3.1 Function
The HeptaDry screw pumps function according to the double screw-pump principle. Two screw rotors
rotate in the compression chamber. The medium to be pumped is trapped between the individual screw
coils, compacted and transported to the gas outlet. During the compaction process, the two screw rotors
do not come into contact with each other, nor with the suction chamber.
Fig. 2:
Operating principle
Operation of this screw pump is instigated with each occurrence of intake pressure between atmos-
phere and final pressure. Despite contactless operation of the screw pump, no operating fluid, such as
oil or water, is necessary within the working chamber. A gas ballast valve, sealing gas device and/or
silencer can be installed at the gas exhaust, depending on the respective application.
1
2
3 4
5
7
8
9
10
6
22
24
23
12
13 14 15
16
17
18
19
20
21
Fig. 3:
Arrangement of screw pump
1
Motor
14
Sealing gas flow rate meter
2
Temperature switch
15
Gas ballast filter
3
Crane lug
16
Motor terminal box
4
Vacuum connection
17
Sealing gas pressure regulator
5
Intake strainer
18
Sealing gas connection
6
Filler screw (2x)
19
Pressure gauge
7
Locking screw
20
Sight glass (2x)
8
Magnetic sealing plug (2x)
21
Drain screw (2x)
9
Exhaust connection
22
Exhaust connection
10 Rubber-metal bumper (4x)
23
Condensate drain
12 Cooling water inlet
24
Silencer
13 Cooling water outlet
Product description
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