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6. After removing the Stem Nut, the remainder of the Disc & Diaphragm Assembly should disassemble easily. Polish stem guide
surfaces with fine emery cloth to remove any mineral deposits and inspect for excessive wear. Remove any mineral build-up from
other components with wire brush or by using a Mineral Dissolving Solution. Inspect parts for wear and replace if necessary.
7. Inspect valve seat. If seat is not damaged, removal is not necessary. Valve seats 6" and smaller are threaded into the body of the
valve and require a seat removal tool (Figure 3) (Table 1 details the tool dimensions for seat removal). Valve seats 8" and larger are
held in the valve body with stainless steel cap screws. Remove seat retaining screws and lift seat straight up (Figure 4).
Table 1: Seat Removal Tool Dimension
Size
A
in
Pipe Size (in)
1 1/4
1
1 1/2
1
2
1 1/4
2 1/2
2
3
2 1/2
4
3
6
5
*Schedule 40 steel pipe
A
B (Min)
120
Figure 3
IOM-A-ACV-910_610 2115
B
Min. Length (in)
3.12
3.12
3.38
4.0
4.5
5.0
6.50
E Dia. 4 Holes
90 Apart
F
C TYP <3 PLCS>
D TYP <3 PLCS>
120 Apart
EDP# 1917028
C
D
in
in
0.38
0.25
0.38
0.25
0.38
0.25
0.38
0.38
0.50
0.38
0.50
0.44
0.62
0.44
Angle or
Channel Iron
Valve Seat
Valve Body
Figure 4
E (Dia.)
F
in
in
0.44
0.55
0.44
0.50
0.44
0.50
0.56
0.62
0.56
0.62
0.56
0.62
0.56
0.62
Nut and Washer
2PLCS
All-Thread
© 2021 Watts
9
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