bürkert 3232 Bedienungsanleitung Seite 21

Type 3232, 3233, 3233 K, 3234,
3235, 3239
Replacement of the diaphragm
Procedure:
→
Clamp valve housing in a holding device (applies only to valves
not yet installed).
→
Cross-loosen fastening screws and remove actuator with dia-
phragm from the housing.
→
Detach or unscrew old diaphragm. If attachment is with a
bayonet catch, loosen the diaphragm by turning it 90° (see table
„Tab. 10: Fastening types for diaphragm").
→
Turn handwheel all the way clockwise (CLOSED position).
→
Install new diaphragm in the actuator (see „Tab. 10: Fastening
types for diaphragm").
→
Turn handwheel all the way counter-clockwise (OPEN position).
→
Align diaphragm.
Note marker for direction of flow!
→
Place actuator back on the housing.
→
Lightly cross-tighten the fastening screws until the diaphragm is
between the housing and actuator.
Do not tighten screws yet.
→
Activate the diaphragm valve once to position the diaphragm
correctly.
→
Tighten the fastening screws with the valve in the open position up
to the permitted tightening torque (see tables in chapter „10.2.1.
Tightening torques for diaphragms").
→
Check the tightening torque of the screws again.
Repairs
10.2.1. Tightening torques for diaphragms
Orifice
Diaphragm
(Diaphragm size)
EPDM / FKM
DN [mm]
8
15
20
25
32
40
50
Tab. 11: Tightening torques for diaphragms, actuator PPS or
stainless steel.
Orifice
Diaphragm
(Diaphragm size)
EPDM / FKM
DN [mm]
65
80
100
Tab. 12: Tightening torques for diaphragms, actuator stainless
steel.
english
Actuator PPS or Stainless steel
Diaphragm
PTFE/advanced
PTFE/laminated
advanced PTFE
2 2,5
3,5 4
4 4,5
5 6
6 8
8 10
12 15
Actuator stainless steel
Diaphragm
PTFE/advanced
PTFE/laminated
advanced PTFE
20 30
30 40
40 50
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