Diaphragm Assembly; Removing; Replacing - ABB AV3 Instruction Manual

REPAIR/REPLACEMENT PROCEDURES

DIAPHRAGM ASSEMBLY

Removing

Tools required

Replacing

DIAPHRAGM ASSEMBLY
8 - 8
(Item numbers reference Figures
⁄
7
-inch Allen wrench
64
Adjustable wrench
1. Transfer the positioner from automatic to manual operation (refer
to Section 5).
2. Using an Allen wrench, remove four diaphragm cover screws
(item 45) and remove diaphragm cover.
3. Remove diaphragm support screw (item 53) and washer (item
54).
NOTE: When removing diaphragm support screw, do not allow the
diaphragm support (item 23) to rotate.
4. Remove diaphragm support (item 23).
5. Carefully remove large diaphragm (item 73) from assembly.
6. Remove diaphragm spacer (item 22).
7. Remove diaphragm ring (item 24).
8. Carefully remove small diaphragm.
1. Place the small diaphragm (item 20) in diaphragm housing with
the concave side facing up. Check for correct alignment of tabs rela-
tive to the diaphragm housing.
2. Place diaphragm ring (item 24) over small diaphragm (item 20).
Make sure the alignment pins on the diaphragm ring properly
engages the other mating parts.
3. Set in place diaphragm spacer (item 22).
4. Place large diaphragm (item 73) in place with the convex side up.
Check for correct alignment of tabs relative to the diaphragm housing.
5. Place diaphragm support (item 23) on large diaphragm.
6. Replace washer (item 54) and screw (item 53). Torque screw to
0.35 Nm (50 in-oz) while securing the diaphragm support (item 23) so
it does not rotate.
9-1 through 9-6).