Optimum Installation; Installation Tips - Grundfos DMH 28X Notice D'installation Et De Fonctionnement

6.5 Optimum installation

1i
Fig. 10 Example of optimum installation
Pos. Components
1i Dosing tank
2i Electric agitator
3i Extraction device
4i Suction pulsation damper
5i Dosing pump
6i Relief valve
7i Pressure-loading valve
8i Pulsation damper
9i Measuring glass
10i Injection unit
8i
2i
Max. 1 m
max. 1m
6i
4i
3i

6.6 Installation tips

• For easy deaeration of the dosing head, install a ball valve
(11i) with bypass line (back to the dosing tank) immediately
after the discharge valve.
• In the case of long discharge lines, install a non-return valve
(12i) in the discharge line.
Fig. 11 Installation with ball valve and non-return valve
• When installing the suction line, observe the following:
– Keep the suction line as short as possible. Prevent it from
becoming tangled.
– If necessary, use swept bends instead of elbows.
– Always route the suction line up towards the suction valve.
– Avoid loops which may cause air bubbles.
Fig. 12 Installation of suction line
9i
7i
10i
5i
12i
11i
21