CAUTION!
Danger of the integral relief valve failing
The integral relief valve no longer operates reliably with feed
chemicals having a viscosity of greater than 200 mPa s.
– Only use the integral relief valve with feed chemicals
having a viscosity up to 200 mPa s.
CAUTION!
Warning against leaks
Feed chemical which remains in the overflow line at the relief
valve, can attack the valve or cause it to leak
– Route the overflow line with a continuous slope and
moreover with the tube nozzle pointed downwards - see
Fig. 16.
If the overflow line is fed into the suction line, the bleed func‐
tion is blocked.
Therefore lead the overflow line back into the storage tank.
When operating the integral relief valve close to the opening
pressure, a minimal overflow into the overflow line can occur.
CAUTION!
Danger resulting from unnoticed diaphragm rupture
If the pump has been ordered with an electric diaphragm rup‐
ture sensor, it still has to be installed.
– Screw the enclosed diaphragm rupture sensor into the
liquid end.
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.
Fig. 16: Permissible alignment of the relief
valve
Diaphragm rupture sensor
Installation, hydraulic
21
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