9.8 Pump head size 30 l/h and 50 l/h
Fig. 22: Replacing the pump head and diaphragm
A Adhesive label: Tightening torque of metering head
screws
1 Metering head screws (4 off)
2 Pump head
3 Diaphragm
4a Intermediate plate without sensor
4b Intermediate plate with sensor
5 Protective diaphragms
6a Diaphragm extension for intermediate plate without
sensor
6b Diaphragm extension for intermediate plate without
sensor
Note the following points during assembly:
– Fit new protective diaphragm in the correct positions.
– Place in the intermediate plate in the correct position.
– T
urn the adapter plate clockwise until the diaphragm rupture drain faces
down.
– Mount the pump head and pay attention to the direction of flow
– Hand-tighten the pump head screws and then tighten them cross-wise.
– Prior to start-up and after 24 hours of operation, the metering head screws
must be diagonally tightened diagonally.
– It is not permitted to exceed the tightening torque to avoid damage to the
thread. If the tightening torque is undershot, this can result in leaks.
Tightening torques, see
Ä
Chapter 13.6 ‘Tightening torques’ on page 78
1. Loosen the metering head screws (pos. 1).
2. Remove the pump head (pos. 2).
3. T
ake out diaphragm (3) and intermediate plate (4a or 4b).
4. Remove the protective diaphragm (5) from the diaphragm extension (6a or 6b).
5. Remove diaphragm extension (6a or 6b) from the plunger
.
6. Reverse this procedure for re-installation.
Maintenance
59 417102264 Rev. 5-01.2019
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