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Installation instructions for the replacement of ProMinent
membrane
1
1 Multi-layer diaphragm
2 Diaphragm mounting plate
3 Spring
4 Safety ring
5 Spring collar
6 Diaphragm anchor
7 O-ring
WARNING
• Always depressurise the suction and discharge tubing before working on the
pump.
• Always empty and rinse the liquid end before working on the pump, if used
with hazardous or unknown materials.
• Always wear appropriate protective equipment when metering hazardous or
unknown liquids!
• Risk of burning by hot hydraulic oil.
Avoid contact with draining oil.
TAKE CARE
• Take the multi-layer diaphragm out of its packing only immediately before
installing it.
2
• Ensure the diaphragm is clean.
• Do not "dismantle" the multi-layer diaphragm.
Otherwise the diaphragm failure monitor may fail.
3
Draining hydraulic oil out of hydraulic unit:
4
Turn stroke position knob beyond "100 %" to the stop
Unscrew the gearbox vent stopper
Place an oil container beneath the hydraulic end
Unscrew the oil drainage stopper from the hydraulic end
Drain out the hydraulic oil from the hydraulic end
5
Screw in the oil drainage stopper with a new seal.
6
Changing the diaphragm:
Remove the liquid end along with the liquid end screws from the hydraulic end
Unfasten the diaphragm mounting plate with the diaphragm (1) from the liquid end.
7
WARNING
The spring and spring collar on the diaphragm anchor can spring back when the
safety ring is released!
Protect your eyes with protective glasses!
Release the safety ring and the spring with the spring collar from the diaphragm
anchor
Remove the diaphragm/diaphragm anchor combination from the diaphragm
mounting plate
Place the new diaphragm/diaphragm anchor combination into the diaphragm
mounting plate
Place the diaphragm spring with the spring collar onto the diaphragm mounting
plate and fasten with the safety ring
Replace the O ring between the diaphragm mounting plate and the hydraulic unit
Position the liquid end plus screws so that the suction connector is pointing
downwards (direction of flow / note arrow markings on the valves)
Fasten the liquid end screws lightly at first, then tighten to 20 Nm breakaway torque
Screw the suction and discharge tubing to the liquid end.
Filling hydraulic end with hydraulic oil:
Set stroke adjustment knob (1) to "100 %" and open bypass valve (tighten knurled
screw)
Slowly pour hydraulic oil through the opening for the gearbox venting stopper until
the oil inspection glass is
Start the pump
Run the pump for 1 - 2 min
Screw in the gearbox vent stopper (do not close!) and close the bypass valve
(slacken the knurled screw)
Run the pump at maximum back pressure and check seals.
TAKE CARE
Check the torque of the liquid end screws after 24 operating hours (20 Nm).
®
Hydro multi-layer
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covered
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