ProMinent 040830 SST, Operating Instructions Manual

Page: 19 / 68

CAUTION!
Warning of feed chemical spraying around
PTFE seals, which have already been used / compressed,
can no longer reliably seal a hydraulic connection.
–
New, unused PTFE seals must always be used.
CAUTION!
Suction problems possible
The valves may no longer close properly with feed chemicals
with a particle size of greater than 0.3 mm.
–
Install a suitable filter in the suction line.
CAUTION!
Warning against the discharge line bursting
With a closed discharge line (e.g. due to a clogged discharge
line or by closing a valve), the pressure that the metering
pump generates can reach several times the permissible
pressure of the system or the metering pump. This could
lead to lines bursting, resulting in dangerous consequences
with aggressive or toxic feed chemicals.
–
Install a relief valve that limits the pressure of the pump
to the maximum permissible operating pressure of the
system.
CAUTION!
Uncontrolled flow of feed chemical
Feed chemicals can leak through a stopped metering pump if
there is back pressure.
–
Use an injection valve or a vacuum breaker.
CAUTION!
Uncontrolled flow of feed chemical
Feed chemical can leak through the metering pump in an
uncontrolled manner in the event of excessive priming pres‐
sure on the suction side of the metering pump.
–
Do not exceed the maximum permissible priming pres‐
sure for the metering pump.
– Arrange the installation properly.
CAUTION!
Warning against leaks
Leaks can occur on the pump connection depending on the
insert used.
–
The pump is supplied with PTFE moulded composite
seals with a flare, which are used for the pump connec‐
tions. They seal the connections between grooved pump
valves and the grooved inserts from ProMinent - see
Fig. 14.
– In the event that an unflared insert is used (e.g. third
party part), an elastomer flat seal must be used - see
Fig. 15.
P_SI_0021
Fig. 14: Moulded composite seals with
corrugated insert
Installation, hydraulic
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