ProMinent Beta BT4b Operating Instructions Manual page 40

Repairs
Tightening torque
40
CAUTION!
Leakage may become apparent at a later stage.
– The leakage hole must point downwards when the
pump is installed later - please refer to !
– Place the backplate (4) immediately into the cor‐
rect position on the pump housing (6)! Do not twist
the backplate on the pump housing so that the
safety diaphragm (5) becomes warped!
18. Place the diaphragm (3) into the backplate (4).
CAUTION!
Leakage may become apparent at a later stage.
– Do not over-tighten the diaphragm (3) in the fol‐
lowing step!
– The backplate (4) must remain in its position so
that the safety diaphragm does not become
warped!
19. Hold the backplate (4) firmly and screw the diaphragm (3) in a clock‐
wise direction until it is sitting tightly (the twisting resistance of the
return spring can be felt).
20. Set the stroke length to 100 %.
21. Place the dosing head (2) with the screws (1) onto the diaphragm
(3) and the backplate (4) - the suction connector must be pointing
downwards in the pumps subsequent fitting position.
22. Gently tighten the screws (1) and then tighten in a diagonal pattern.
See below for tightening torque.
23. With PP types with bleed valve: Allow the cover of the liquid end to
rest in the dosing head, then press the knob on the bleed valve into
the dosing head.
CAUTION!
Leakage possible
– Check the tightening torque of the screws after
24-hours of operation!
– With PP dosing heads, recheck the tightening
torque again after three months!
Data
Tightening torque for screws:
Value Unit
4.5 ... 5.0 Nm