Replacing The Diaphragm - Burkert 2730 Manuel D'utilisation

12.2

replacing the diaphragm

required spare part
• Diaphragm
fastening types
Orifice dn fastening types for diaphragms
(diaphragm
ptfe
size)
65
Diaphragm with bayonet
80
catch
100
Tab. 9: Fastening types for diaphragms
Danger!
risk of injury from discharge of medium and pressure!
It is dangerous to remove a device which is under pressure due to
the sudden release of pressure or discharge of medium.
▶ Before removing a device, switch off the pressure and vent the
lines.
22
epdm / fkm
Diaphragm screwed in
english
Type 2730 / 2731 DN 65-100
Repairs
replacement for control function a
→
Clamp the valve body in a holding device
(applies only to valves not yet installed).
notiCe!
damage to the diaphragm or the seat contour!
▶ When removing the actuator, ensure that the valve is in open
position.
→
Pressurize lower pilot air port of the actuator with compressed
air (5 bar): valve opens.
→
Loosen the body screws / body nuts.
→
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.
→
Insert the body screws / body nuts and lightly cross-tighten until
the diaphragm is between the body and actuator.
do not tighten the body screws / body nuts yet.
→
Actuate the diaphragm control valve twice.
→
Without pressurization tighten the body screws / body nuts
to the permitted tightening torque (see "Tab. 10: Tightening
torques for diaphragms").