Cleaning Or Replacing The Diaphragm Of The Integral Relief Valve; Returning The Product - Grundfos DMX 221 Installations- Und Bedienungsanleitung

7.6 Cleaning or replacing the diaphragm of the integral relief valve

• Observe section Safety instructions for maintaining the dosing diaphragm or the valves
• Observe section Preparing for maintenance of the dosing diaphragm or the valves
• Make sure a return flow or overpressure cannot occur.
1. Unscrew the four screws of the integral relief valve.
2. Remove the top part of the integral relief valve.
3. Remove the diaphragm.
4. Clean all parts and check that the parts are intact.
5. Replace faulty parts with new ones.
6. Insert the diaphragm.
7. Refit the top part of the integral relief valve.
8. Cross-tighten the screws with the correct torque.
9. After approximately 48 operating hours, retighten the screws with the correct torque.
Related information
• 7.2 Safety instructions for maintaining the dosing diaphragm or the valves
• 7.3 Preparing for maintenance of the dosing diaphragm or the valves
• 9.3.1 Torque values

7.7 Returning the product

There are two situations when a pump must be sent to Grundfos or an authorised service work-
shop:
• every five years for gear grease exchange
• whenever you request service on the pump.
Grundfos can refuse to accept the product for service, if it is not cleaned from chemicals or if the
"Safety declaration" is not provided.
1. Clean the pump thoroughly before returning it. Make sure there are no traces of toxic or haz-
ardous chemicals remaining on the pump.
If proper cleaning is not possible, provide all relevant information about the chemical.
2. Fill out the "Safety declaration" and attach it to the pump in a visible position.
You can find the "Safety declaration" at the end of this document.
3. Make sure the product is suitably protected during transport.
Related information
• 6. Taking the product out of operation
• 4.1 Handling the product
WARNING
Chemical hazard
Death or serious personal injury
● Observe the material safety data sheet of the dosing medium.
● Wear protective clothing when working on the dosing head, connections or
lines.
● Collect and dispose of all chemicals in a way that is not harmful to persons or
the environment.
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