Grundfos DDI 209, Инструкция по установке и эксплуатации

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• In the case of long discharge lines, install a
non-return valve (12i) in the discharge line.
Fig. 19 Installation with non-return valve
5.6 Tube / pipe lines
5.6.1 General
With Plus
3
system
• Use the suction line with foot valve and empty
signal.
• For degassing media, maintain a maximum
suction lift of 1.5 m.
• Open the isolating valve on the calibration
system.
Maximum suction line length
• 5 m for standard pumps or pumps with Plus
3
system when dosing media with a viscosity
similar to water.
• 1.2 m when dosing media with a higher viscosity
than water.
5.6.2 Sizing of tube / pipe lines
Minimum internal diameter
5.6.3 Connecting the suction and discharge lines
• Connect the suction line to the suction valve (3a).
– Install the suction line in the tank so that the
foot valve remains approximately 5 to 10 mm
above the bottom of the tank or the possible
level of sedimentation.
• Connect the discharge line to the discharge
valve (3b).
Fig. 20 Connecting the suction and discharge
lines
TM
03
62
33
45
06
Warning
To protect the dosing pump against
excessive pressure build-up, install
a relief valve in the discharge line.
All lines must be free from strain!
Avoid loops and buckles in the tubes!
Keep the suction line as short as
possible!
The flow must run in the opposite
direction to gravity!
Observe the manufacturer's safety
instructions when handling chemicals!
Caution
The resistance of the parts that come
into contact with the media depends on
the media, media temperature and
operating pressure. Ensure that parts
in contact with the media are
chemically resistant to the dosing
medium under operating conditions!
Only use the specified line types!
Warning
PVC tube DN 4 is not suitable for use
as a discharge line!
Connect PE tube DN 4 on the discharge
side!
6i
12i
Warning
Observe the pressure stage of the used
lines. The maximum permissible inlet
pressure and the pressure stage of the
discharge lines must not be exceeded!
Pump type
Pump version
Standard HV variant
[mm] [mm]
DDI 0.4-10 4
Suction side: 5
Discharge side: 4
DDI 2.2-16
4 6 DDI 2.5-10
DDI 5.5-10
DDI 13.8-4
6
Suction side: 9
Discharge side: 6
DDI 20-3
TM
03 62
35 45
06
Pos. Components
3a Suction valve
3b Discharge valve
C Pipe connection
D Tube connection
A
B
C
D
3b
D
C
3a