
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!
Danger due to incorrect use of the pressure relief valve
The pressure relief valve can only protect the motor and the
gear, and that only against impermissible positive pressure
that is monitored by the metering pump itself. It cannot pro‐
tect 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.
–
Precise metering is only possible when the back pres‐
sure is maintained above 1 bar at all times.
–
If metering at atmospheric pressure, a back pressure
valve should be used to create a back pressure of
approx. 1.5 bar.
CAUTION!
Warning of unnoticed diaphragm rupture
Only above approximately 2 bar system back pressure is a
signal generated upon a diaphragm rupture.
–
Only rely on the diaphragm rupture sensor at back pres‐
sures greater than 2 bar.
7.1.1 Basic installation notes
CAUTION!
Danger resulting from rupturing hydraulic components
Hydraulic components can rupture if the maximum permis‐
sible operating pressure is exceeded.
–
Never allow the metering pump to run against a closed
shut-off device.
–
With metering pumps without integral relief valve: Install
a relief valve in the discharge line.
CAUTION!
Hazardous feed chemicals can escape
With hazardous feed chemicals: Hazardous feed chemical
can leak out when using conventional bleeding procedures
with metering pumps.
–
Install a bleed line with a return into the storage tank.
P_SI_0022
Fig. 12: Elastomer flat seal for a smooth
insert
Diaphragm rupture sensor
Safety notes
Installation
27
Содержание Hydro 3 Series
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