Burkert Type 2105 - Manual (Page 38)

38
Repairs
Warning!
for control function i – danger if pilot pressure fails!
For control function I control and resetting occur pneumatically. If
the pressure fails, no defined position is reached.
▶ To ensure a controlled restart, first pressurize the product with
pilot pressure, then switch on the medium.
11.2 replacing the diaphragm
required spare part
• Diaphragm
fastening types
Orifice dn
(diaphragm
size) fastening types for diaphragms
ptfe
epdm / fkm
8 Diaphragm buttoned
Diaphragm buttoned 15
Diaphragm with bayonet
catch
20
25
Diaphragm with bayonet
catch
Diaphragm screwed in 40
50
Tab. 15: Fastening types for diaphragms
Danger!
risk of injury from discharge of medium and pressure!
It is dangerous to remove a product which is under pressure due
to the sudden release of pressure or discharge of medium.
▶ Before removing a product, switch off the pressure and vent the
lines.
replacement for control function a
→
Clamp the valve body in a holding product
(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 pilot air port 1 of the actuator with compressed air (5
bar): valve opens.
→
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. 39”)!
→
Place actuator back on the body.
english
Type 2103, 2104, 2105