Burkert 2730 Manuel D'utilisation page 29

Type 2730 / 2731 / 2731K
Marker flap of the
Actuator
Upper pilot air port
Lower pilot air port
Diaphragm
Body screws (4x)
Valve body
Fig. 20: Repairs
replacement for control functions B
→
Clamp the valve body in a holding device.
(applies only to valves not yet installed).
→
Loosen the four body screws.
→
Remove the actuator from the body.
→
Unbutton or unscrew old diaphragm. If attachment is with a
bayonet catch, remove the diaphragm by rotating it through 90°.
→
Install new diaphragm.
→
Align diaphragm.
the marker flap of the diaphragm must be perpendicular to
the direction of flow (see "Fig. 20")!
Repairs
diaphragm
→
Place actuator back on the body.
→
Lightly cross-tighten the body screws without pressurization until
the diaphragm is between the body and actuator.
do not tighten screws yet.
→
Pressurize upper pilot air port of the actuator with compressed
air (5 bar) (see "Fig. 20").
→
Actuate the diaphragm control valve twice.
→
With pressurization tighten the body screws to the per-
mitted tightening torque (see "Tab. 14: Tightening torques for
diaphragms").
Orifice dn tightening torques for diaphragms [nm]
(diaphragm
epdm
size)
15 3.5
20 4
25 5
32 6
40 8
50 12
Tab. 14: Tightening torques for diaphragms
english
ptfe
4
4.5
6
8
10
15
29