KM 251 en
24 15.720148-V1.0
Tank installation:
• For non-degassing media with viscosity similar to
water, the pump can be mounted onto the tank
(observe the admissible suction height).
Preferable for flooded suction.
For dosing media which tend to sedimentation:
• Install a suction line with filter (13i) in a way ensuring
that the suction valve remains several centimetres a
bove the botton of the tank.
Pressure retention valve
With open outflow of the dosing medium or low counter-
pressure:
A positive pressure difference of at least 2 bar has to exist bet-
ween the counterpressure at the injection point and the pres-
sure of the dosing medium at the suction valve of the dosing
pump.
If this cannot be guaranteed:
• Install a pressure retention valve (7i) directly in front of the
outlet or the injection unit.
Pressure retention valve
To avoid the siphon effect:
• Install a pressure retention
valve in the dosing line and, if
necessary, a solenoid valve
(14i) in the suction line.
Overflow valve
To protect the dosing pump and the pressure line
against:
• Install an overflow valve (6i) in the pressure line.
For volatile media:
• flooded suction
• Install a filter in the suction line to prevent the valves
being contaminated.
p
10i
6i
13i
7i
p
≥
2 bar
14i
p
1
p
2
p
2
- p
1
1 bar
>
_
6i
10i
p
6i
10i
p
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