Maintenance Interval; Replacing Diaphragm - Georg Fischer DIASTAR SIX Manuel D'utilisation D'origine

Dismounting diaphragm valve or opening the housing nut
The medium may exit uncontrollably or flow out from the pipe or valve,
whether under pressure or not. The valve or pipe may contain residue or rem-
Warning
nants of an aggressive, hazardous, flammable or explosive medium.
Death or serious injury could occur due to contact with the medium.
• Release all pressure from the piping system.
• Empty the piping system completely.
• Rinse the system, if aggressive, hazardous, flammable or explosive media
are involved.
• Empty the diaphragm valve completely when is has been dismounted. In
order to do so, let the valve drain completely.

8.1 Maintenance interval

We recommend inspecting the diaphragm at the latest after:
• 100,000 cycles with less than 10 bar nominal pressure at 20 °C and water
• 50,000 cycles with 10 bar or higher nominal pressure at 20°C and water
If the flow medium has higher temperatures, other chemicals or abrasive particles, we
recommend more frequent inspections. The diaphragm can be checked by opening the
housing nut.

8.2 Replacing diaphragm

Dismounting diaphragm valve or opening the housing nut
The medium may exit uncontrollably or flow out from the pipe or valve,
whether under pressure or not. The valve or pipe may contain residue or rem-
Warning
nants of an aggressive, hazardous, flammable or explosive medium.
Death or serious injury could occur due to contact with the medium.
• Release all pressure from the piping system.
• Empty the piping system completely.
• Rinse the system, if aggressive, hazardous, flammable or explosive media
are involved.
• Empty the diaphragm valve completely when is has been dismounted. In
order to do so, let the valve drain completely.
1. Drain and de-pressurized the pipeline. Please consider safety message "Dismounting
diaphragm valve or opening the housing nut"
2. Move the valve into the "open" position with the control medium (FC,DA)
43