KM 251 en
34 15.720148-V1.0
Set the pressure relief valve as follows:
Caution
Risk of damage to the pump or system! The pressure relief valve looses its
function through blocking, and can produce pressures of several hundred bar in
the pump or system. Do not block the pressure relief valve during adjustments!
5. Close the cover of the pressure relief valve again.
6. Open the shut-off valve after the manometer.
7.4 Zero Point Adjustments
7.4.1 Adjusting the zero point for system pressures up to 100 bar
The zero point of the dosing pump is factory-set to a slightly smaller counterpressure than
the bleed pressure of the pump. If the operating counterpressure deviates considerably
from this value, adjusting the zero point will ensure that the values are more precise.
Counterpressure for zero point setting of the pump at the factory
7.4.2 Adjusting the Zero Point
!
Warning
When dosing dangerous media, observe the corresponding safety precautions!
When working on the dosing head, connections or lines:
wear the necessary protective clothing (goggles, gloves! Always adjust the value
with the pressure line connected and with operating counterpressure.
1. Fit a measuring device on the suction side, e.g. place the suction line in a graduated
1. Close the shut-off valve after the manometer.
2. Remove the cover (1m) of the pressure relief
valve.
3. Start up pump.
4. Using the screwdriver, slowly turn the adjusting
screw (2m) of the pressure relief valve anticlock-
wise, until the desired opening pressure is obtai-
ned.
2m
1m
Bleed pressure of
the pump [bar]
Counterpressure for zero point setting
of the pump at the factory [bar]
10 3
16 3
25 10
L Stroke adjustment button
1l Cover
2l Locking screw
3l Screw
4l Scale ring
3l 2l 1l
4l
3l
L
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