CAUTION!
Warning of backflow
Liquid ends, foot valves, back pressure valves, relief valves
or spring-loaded injection valves do not constitute absolutely
leak-tight sealing elements.
– Use a shut-off valve, a solenoid valve or a vacuum
breaker for this purpose.
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 physiologically
harmful seals.
– Do not route feed chemical that escapes from the inte‐
gral bleed valve or the integral relief valve back into the
process.
CAUTION!
Danger due to incorrect use of the integral relief valve
The integral relief valve can only protect the motor and the
gear, and then only against impermissible positive pressure
that is caused by the metering pump itself. It cannot protect
the system against positive pressure.
– Protect the motor and gear of the system against posi‐
tive pressure using other mechanisms.
– Protect the system against illegal positive pressure using
other mechanisms.
CAUTION!
Warning of feed chemical spraying around
If no relief valve was connected to the overflow line, the feed
chemical sprays out of the hose connection as soon as the
relief valve opens.
– An overflow line must always be connected to the inte‐
gral relief valve and be fed back to the storage tank or -
if required by the regulations - into a special storage
tank.
CAUTION!
Danger of cracking
Cracking of the PVT liquid end can occur if a metal overflow
line is connected to the relief valve.
– Never connect a metal overflow line to the relief valve.
Fig. 15: Elastomer flat seal for a smooth
insert
Integral relief valve
Installation, hydraulic
20
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