–
Precise metering is only possible when the back
pressure is maintained above 1 bar at all times.
–
If metering at atmospheric pressure, a back pres‐
sure valve should be used to create a back pressure
of approx. 1.5 bar.
CAUTION!
Warning of backflow
A back pressure valve, spring-loaded injection valve,
relief valve, foot valve or a liquid end do not represent
absolutely leak-tight closing elements.
– Use a shut-off valve, a solenoid valve or a vacuum
breaker for this purpose.
CAUTION!
To check the pressure conditions in the piping system it
is recommended that connecting options are provided
for a manometer close to the suction and pressure con‐
nector.
1 Manometer socket
2 Discharge line (pipe)
3 Discharge valve
4 Suction valve
5 Suction line (pipe)
CAUTION!
Connect the pipelines to the pump so that no residual
forces act on the pump, e.g. due to the offsetting, weight
or expansion of the line.
Only connect steel or stainless steel piping via a flexible
piping section to a plastic liquid end.
1 Steel piping
2 Flexible pipe section
3 Plastic liquid end
WARNING!
Product can be dangerously contaminated
Only with the design "Physiologically safety with regard
to wetted materials".
If the integral bleed valve or the integral relief valve
opens, the feed chemical comes into contact with phys‐
iologically harmful seals.
– Do not route feed chemical that escapes from the
integral bleed valve or the integral relief valve back
into the process.
Fig. 15: Elastomer flat seal for a smooth
insert
Fig. 16: Manometer connecting options
Fig. 17: Steel pipeline at the liquid end
Integral relief valve or integral bleeder
valve
Installation
28
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