Burkert Type 2031 - Handbuch (Seite 8)

8 - 2030/2031
english
4 replaCe DiaphraGM
4.1 replace diaphragm in Control function a (Cfa)
4.1.1 installation
Required parts: 1 diaphragm (Pos. 21)
Diaphragm fixation types:
epDM- or fkM-diaphragm
- DN 8, 15, 20, buttoned diaphragm
- DN 25 - 65, screwed-in diaphragm
ptfe-diaphragm
- DN 8, buttoned diaphragm
- DN 15 - 65, bayonet fixation
Work steps:
• Pressurize actuator with control pressure.
• Unfasten the 4 enclosure screws (Pos. 24).
• Remove valve body (Pos. 22).
• Replace old / defective diaphragm
(Pos. 21).
Caution!
Diaphragm and all diaphragm contacting parts must be kept
grease-free by any means!
• Align diaphragm:
Mark tab of diaphragm must be in 90° position to the flow direction.
• Put valve body (Pos. 22) back on.
• Pressurize actuator with control pressure
- Bring enclosure screws to the system (Pos. 24)
- Switch actuator twice
- Tighten screws (Pos. 24) crosswise in unpressurized condition.