Grundfos Alldos DDI-209 User Manual - Industry Surplus Australia

10. Maintenance10.1 General notes10.2 Maintenance intervalsCautionWarningWhen dosing dangerous media,observe the corresponding safetyprecautions!Risk of chemical burns!Wear protective clothing (gloves andgoggles) when working on the dosinghead, connections or lines!Do not allow any chemicals to leak fromthe pump. Collect and dispose of allchemicals correctly!WarningThe pump housing must only beopened by personnel authorised byGrundfos Alldos!Repairs must only be carried out byauthorised and qualified personnel!Switch off the pump and disconnect itfrom the power supply before carryingout maintenance work and repairs!In the event of a diaphragm leakage, thedosing liquid may leak out of the hole inthe intermediate flange between thepump and the dosing head. The partsinside the housing are protected fromthe dosing liquid for a short time(depending on the type of liquid) bythe housing sealing. It is necessary tocheck regularly (daily) if liquid isleaking out of the intermediate flange.For maximum safety, we recommendthe pump version with diaphragmleakage detection.• At least every 12 months or after 4,000 operatinghours. When dosing crystallising liquids, morefrequently.• In the event of a fault.10.2.1 Cleaning the valves and diaphragm• Clean the diaphragm and valves and replace, ifnecessary (for stainless-steel valves: inner valveparts).10.3 Cleaning suction and dischargevalvesNoteIf possible, rinse the dosing head,e.g. by supplying it with water.10.3.1 Switching off the pump1. Switch off the pump and disconnect it from thepower supply.2. Depressurise the system.3. Take suitable steps to ensure that the returningdosing medium is safely collected.10.3.2 Unscrewing the priming chamber valve(Plus 3 system)When using the Plus 3 system, unscrew the primingchamber valve (3c) as follows:1. Remove the cover (L) from the priming chamber.2. Remove the valve tube (R) with the valve (3c).3. Unscrew the valve (3c) from the valve tube.F024Fig. 68 Priming chamber valve10.3.3 Unscrewing suction and discharge valves/cleaning valves1. Unscrew the suction and discharge valves.2. Dismantle the inner valve parts:• Standard DN 4/DN 8 valve:– Carefully push out the inner valve part using athin wire nail (or paper clip) in the flow direction(see arrow on the valve body).– Dismantle the inner parts: seat (4r), O-ring (1r),balls (3r), ball cages (2r).R3cL1r2r3r4r2r3r4r3TM03 6264 4506TM03 6265 4506Fig. 69 Standard DN 4/DN 8 valve64