Diaphragm
ø
Torque (+/- 10%)
52 125 Ncm
64 2 Nm
90 6 Nm
120 6 Nm
150 10 Nm
Table 11.1: Required tightening torque for dosing head screws
11.5 Valves
The dosing pump valves must be cleaned regularly.
NOTICE!
When screwing the valves back into the dosing head, note the tightening torque of 2 Nm ±20 %.
CAUTION!
Chemical may spray out. This may lead to chemical or other burns. The dosing pump must always be
depressurised and rinsed with water or a suitable medium before starting any work on the dosing pump.
NOTICE!
Dirty valves will affect the dosing accuracy.
DN4 valves
DN4 valves are pre-assembled, and can be unscrewed from the dosing head as a single unit. To disassem-
ble the valves, use a screwdriver with a 10 mm bit.
a
b
a Valve body
b Screw-in valve plug
32 | Operation & Maintenance Instructions | Maintenance
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