IM-S21-01 CH Issue 7
11
How to replace the bellows assembly
Remove the bonnet assembly and the bellows assembly by unscrewing the bellows assembly
guide X. Remove the circlip C, washer U, head A and seal B and refit to the new bellows
assembly in reverse order.
Refit the new bellows assembly and back seal plunger to the valve bonnet. Refit the
bonnet assembly using the new gaskets taking care to the tighten bonnet nuts evenly to the
recommended torque (see Table 1).
Table 1 Recommended tightening torques (N m)
KA61 and KA63 KC63
Size Seat Bonnet nuts Seat Bonnet nuts Bellows assembly
DN15 50 18 - - -
DN20 110 23 - - -
DN25 160 28 - - -
DN32 100 43 100 40 180
DN40 150 43 150 40 180
DN50 180 63 165 60 200
E
D
U
A
B
X
H
G
N
L
S
A
KA63 and KC63
KA61
C
Fig. 9
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