Burkert 2031 Manuel Utilisateur page 12

4.2.2 Spring-to-open (B) valve
- Unscrew the 4 fixing screws in an alternating pattern and remove the actuator.
- Apply the control pressure indicated on the label to the upper orifice of the
valve: the diaphragm moves forward.
- 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).
- Remove the pressure.
- Place back the actuator and the screws.
- Screw in an alternating pattern until the actuator is in its proper place, without
tightening.
- Apply the pressure again and actuate the valve twice so that the diaphragm
positions itself correctly.
- Remove the pressure then tighten the screws in an alternating pattern to the
torque rating (in Nm) specified below:
- Apply again the control pressure indicated on the label to the upper orifice of the
valve.
- Check the torque rating of the 4 screws. Tighten if necessary.
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MAINTENANCE
Material of the diaphragm
DN
Elastomer
8 2
15 3,5
20 4
25 5
40 8
50 12
80 30
100 40
12
PTFE/EPDM
2,5
4
4,5
6
10
15
55
50
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