Installation
Hydraulic installations
14
© Lutz-Jesco GmbH 2017
BA-20710-02-V05
Chlorine control valve
C 7700
Operating instructions
7.3 Hydraulic installations
7.3.1 Back-pressure regulator
The regulation valve requires a constant differential pressure in order to
work properly. This is why we recommend to use a back-pressure
regulator that compensates fluctuations in the injector vacuum. Exact
dosing is only possible with a back-pressure regulator.
The back-pressure regulator is not always a separate component. It is
often integrated into the dosing device or injector non-return valve.
Fig. 5: Installation with back-pressure regulator
Item
Description
1
Flow meter with manual regulation valve
2
Automatic regulation valve
3
Back-pressure regulator
4
Injector with non-return valve
Table 9: Legend Fig. 5
7.3.2 Pipe length and nominal width
For instance, PVC-U pipes or PE hoses are used as vacuum lines.
The following nominal widths are recommended for the vacuum line
between dosing device and injector (max. pressure decrease: 25 mbar,
calculated at 0.75 bar (a) with 4x90° angles):
Mass flow
of chlorine
L2: Length of the vacuum line between the dosing
device and the injector
5 m
10 m
20 m
30 m
50 m
100 m
0.5 kg/hr
DN 8
DN 8
DN 8
DN 8
DN 8
DN 8
1 kg/hr
DN 8
DN 8
DN 8
DN 8
DN 8
DN 12
2 kg/hr
DN 8
DN 8
DN 8
DN 12
DN 12
DN 12
2.5 kg/hr
DN 8
DN 8
DN 12
DN 12
DN 12
DN 12
4 kg/hr
DN 8
DN 12
DN 12
DN 12
DN 15
DN 15
5 kg/hr
DN 12
DN 12
DN 12
DN 12
DN 15
DN 20
10 kg/hr
DN 12
DN 15
DN 15
DN 20
DN 20
DN 20
15 kg/hr
DN 15
DN 15
DN 20
DN 20
DN 20
DN 25
25 kg/hr
DN 20
DN 20
DN 20
DN 25
DN 25
DN 32
40 kg/hr
DN 25
DN 25
DN 25
DN 32
DN 32
DN 40
60 kg/hr
DN 32
DN 32
DN 32
DN 32
DN 40
DN 40
120 kg/hr
DN 40
DN 40
DN 40
DN 40
DN 50
DN 65
200 kg/hr
DN 50
DN 50
DN 50
DN 50
DN 65
DN 65
Table 10: Recommended nominal widths between the dosing device and injector
1
2
3
4
