12
– Dismantle the inner parts: seat (4r), O-ring (1r), balls (3r), ball cages (2r).
– Unscrew the valve cover.
3. Clean all parts. If faulty parts are detected, proceed as follows:
– Replace the valve (for stainless-steel valves: inner valve parts). For contents and order numbers of the spare parts kits,
contact Grundfos Alldos.
1 Re-assemble and refit the valve.
2 Remove the deaeration cartridge (1p, 2p, 3p) under the discharge valve from the dosing head using a pair of tweezers.
– Dismantle the cartridge.
– Clean the cartridge. If faulty parts are detected, proceed as follows:
– Replace the deaeration cartridge. For contents and order numbers of the spare parts kits, contact Grundfos Alldos.
– Re-assemble the cartridge.
6. Refit all parts. See fig. 10 on page 16.
The O-rings must be correctly placed in the specified groove.
Observe the flow direction (indicatedby an arrow)!Only tighten the valve by hand.
9.4 Replacing the diaphragm
9.4.1 Switching off the pump
1 While the pump is running, set the stroke-length adjustment knob to 100 %.
2 Switch off the pump and disconnect it from the power supply.
3 Depressurise the system.
4 Take suitable steps to ensure that the returning dosing medium is safely collected.
9.4.2 Replacing the diaphragm
See fig. 11 on page 16.
1 Loosen the four screws (1q + 2q) on the dosing head (2).
2 Remove the dosing head (2).
3. Unscrew the diaphragm (Q) counter-clockwise.
– For pumps without Plus
3
system: Replace the sealing diaphragm (3q), intermediate ring (4q) and support disk (5q).
4 Screw in the new diaphragm (Q).
5 Start/stop the pump briefly so that the diaphragm is set to the back dead point (end of suction stroke).
6 Replace the dosing head (2) and cross-tighten the screws (1q + 2q).
Maximum torque: DMB 1.0 - DMB 5.0: 2.1 Nm. DMB 9.0 - DMB 18: 2.5 Nm.
7 Vent and start up the dosing pump.
After initial start-up and after each time the diaphragm is changed, tighten the dosing head screws.
After approximately 6-10 operating hours or two days, cross-tighten the dosing head screws using a torque
wrench.
Maximum torque: DMB 1.0 - DMB 5.0: 2.1 Nm. DMB 9.0 - DMB 18: 2.5 Nm.
To Next Page
Loading...
Need help?
General
