Below “fig. 32: control air connection”), Tab. 11: tightening torques for diaphragms – Burkert Type 2037 User Manual
Page 32
32
Repairs
replacement of the diaphragm for control functions B and i
→
Clamp the valve body in a holding device (applies only to valves
not yet installed).
→
Loosen the fastening screws crosswise and remove actuator
together with diaphragm from the body.
→
Unbutton or unscrew old diaphragm. If attachment is with a bayonet
catch, remove the diaphragm by rotating it through 90° (see “Tab.
10: Fastening types for diaphragms”).
→
Install new diaphragm in actuator (see “Tab. 10: Fastening types
for diaphragms”).
→
Align diaphragm.
Observe mark tab for direction of flow!
→
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 the screws yet.
→
Pressurize upper control air connection with compressed air
(value as indicated on the type label) (see “Fig. 32: Control air
connection”).
→
Actuate the diaphragm valve twice.
→
Tighten the body screws to the permitted tightening torque (see
“Tab. 11: Tightening torques for diaphragms”).
Lower control air connection
(for CFA and CFI)
Upper control air connection
(for CFB and CFI)
Fig. 32: Control air connection
Orifice
(Diaphragm size)
[mm]
tightening torques for diaphragms [nm]
epdm / fkm
ptfe / advanced ptfe /
laminated advanced ptfe
8
2
2.5
15
3.5
4
20
4
4.5
25
5
6
32
6
8
40
8
10
50
12
15
65
20
30
Tab. 11: Tightening torques for diaphragms
english
Type 2030, 2031, 2031 K, 2032,
2033, 2037