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 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.
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
positive 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
integral 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 over‐
flow line is connected to the relief valve.
– Never connect a metal overflow line to the relief
valve.
Fig. 16: Elastomer flat seal for a smooth
insert
Integral relief valve
Installation, hydraulic
29
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