Burkert 2031 Manuel Utilisateur page 14

- Apply the control pressure indicated on the label to the lower orifice of the valve:
the diaphragm separates from the body.
- Unscrew the 4 nuts in an alternating pattern and remove the valve actuator.
- Remove the pressure.
- Remove the diaphragm:
•
For DN15 and 20, remove the elastomer diaphragm.
•
For DN > 20, unscrew the elastomer diaphragm.
•
For a PTFE/EPDM diaphragm, turn a quarter turn to release the bayonet.
- Place back the new diaphragm so that the fixing holes are aligned with those of
the diaphragm (screw home if necessary).
- Apply the control pressure indicated on the label to the lower orifice of the valve.
- Place back the actuator and the nuts.
- Screw in an alternating pattern until the actuator is in its proper place, without
tightening.
- Actuate the valve twice so that the diaphragm positions itself correctly.
- Remove the pressure then tighten the nuts in an alternating pattern to the
torque rating (in Nm) specified below:
- Apply again the control pressure indicated on the label to the lower orifice of the
valve.
- Check the torque rating of the 4 nuts. Tighten if necessary.
For 3A approved products, please use only sterile food grade lubricant
complying with CFR 21 Part 178.3570.
All manuals and user guides at all-guides.com
MAINTENANCE
Material of the diaphragm
DN
Elastomer
8 2
15 3,5
20 4
25 5
40 8
50 12
80 30
100 40
14
PTFE/EPDM
2,5
4
4,5
6
10
15
55
50
2031-2032-2033