Burkert 2730 Manuel D'utilisation page 23

Type 2730 / 2731 DN 65-100
Fig. 14: Repairs
replacement for control functions B
→
Clamp the valve body in a holding device
(applies only to valves not yet installed).
→
Loosen the body screws / body nuts.
Repairs
Marker flap of the
diaphragm
Actuator
Upper pilot air port
Lower pilot air port
Diaphragm
Body screws / body nuts
Valve body
→
Remove the actuator from the body.
→
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. 14")!
→
Place actuator back on the body.
→
Lightly cross-tighten the body screws / body nuts without pres-
surization until the diaphragm is between the body and actuator.
do not tighten body screws / body nuts yet.
→
Pressurize upper pilot air port of the actuator with compressed
air (5 bar) (see "Fig. 14").
→
Actuate the diaphragm control valve twice.
→
With pressurization tighten the body screws / body nuts to the
permitted tightening torque (see "Tab. 10: Tightening torques for
diaphragms").
tightening torques
Orifice dn tightening torques for diaphragms [nm]
(diaphragm
epdm
size)
65 20
80 30
100 40
Tab. 10: Tightening torques for diaphragms
english
ptfe
30
40
50
23