Grundfos ALLDOS KM 251 - Tube;Pipe Lines; General; Connecting the Suction and Pressure Lines

KM 251 en
26 15.720148-V1.0
5.3 Tube/Pipe Lines
5.3.1 General
!
Warning
The resistance of the parts that come into contact with the media depends on the
media, media temperature and operating pressure. Ensure the parts that come into
contact with the media are chemically resistant to the dosing medium in operating
conditions!
Only use the specified line types! All lines must be free from strain! If necessary,
use swept bends instead of elbows, avoid loops and buckles in the tubes! Ensure
the suction line is as short as possible to avoid cavitation!
To protect the system against excessive build-up of pressure:
Install an overflow valve in the pressure line.
Flow must run in the opposite direction to gravity!
!
Warning
Observe the manufacturer's safety instructions when handling chemicals!
5.3.2 Connecting the Suction and Pressure Lines
• Connect the suction line to the suction valve.
• Connect the pressure line to the pressure valve.
Note
Install suction line in the tank so that the foot valve remains approximately 5 to 10
cm above the bottom of the tank.
When connecting hose lines
• Push the hose firmly onto the connection nipple
and depending on the connection, secure using a
connection counterpart or hose support clip.
• Fit gasket.
• Screw onto the valve using the union nut.
When connecting pipe lines to DN 20
• Depending on the pipe material and connection,
glue it (PVC), weld it (PP, PVDF or stainless
steel) or press it in (stainless steel).
• Fit gasket.
• Screw onto the valve using the union nut.