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 using feed chemi‐
cals 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.
–
Configure the installation correctly for this purpose.
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.
Installation
18
Содержание Sigma / 2 Basic Type SBKa
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