Type 119
4
5. Unscrew and remove the spring case cap screws
(key 14). Remove the spring case, upper spring
seat, and spring (keys 2, 17, and 16). Do not
lose the nameplate (key 20) when removing the
spring case.
6. Pull the hairpin clip (key 6) from the stem and
remove the disk holder assembly (key 4).
7. Pull the diaphragm/stem assembly (key 5) out of
the bonnet (key 9), and inspect for damage or
deterioration. If necessary, replace the entire
diaphragm assembly.
8. Without removing the O-rings and bushing spacers
(keys 8 and 7) inspect their inside diameter
surfaces for damage or deterioration.
9. Remove the internal retaining rings, stem wipers,
O-rings, and bushing spacers (keys 10, 19, 8 and 7).
Inspect these parts for wear or deterioration,
and replace if necessary.
This procedure assumes that the control valve has
been completely disassembled. If the control valve
has been only partially disassembled, start these
instructions at the appropriate step.
1. If the orice (key 3) was removed during disassembly,
lubricate the threads with Never-Seez
(1)
lubricant
(key 21) or equivalent, and screw it into the valve body
using a thin wall 7/8-inch (22 mm) socket wrench.
2. Lubricate the bushing spacers, O-rings, stem wipers,
and internal retaining rings (keys 7, 8, 19, and 10)
with Dow Corning
(2)
No.111 silicon-base lubricant
(key 22) or equivalent, and install as shown in
Figure 3.
3. Carefully slide the diaphragm assembly (key 5) into
and through the O-rings and bushing cavity. Turn the
diaphragm assembly to line up the diaphragm holes
with the bonnet holes.
4. Slide the disk holder assembly (key 4) all the way
into the stem. Connect the disk holder assembly with
the hairpin clip (key 6).
5. Coat the bonnet O-ring (key 11) with Dow Corning
No. 111 lubricant (key 22) or equivalent. Install the
O-ring in the recessed notch in the bonnet (key 9).
6. Mount the bonnet (key 9) on the valve body (key 1),
insert two cap screws (key 15, not shown), and
tighten to 7 foot-pounds (9,5 N•m).
7. Put the spring (key 16) on the diaphragm assembly
(key 5), and place the upper spring seat (key 17) in
the end of the spring.
8. Lubricate the point and threads of the adjusting
screw (key 12) with Never-Seez
(1)
lubricant (key 21)
or equivalent.
9. Position the spring case (key 2) and nameplate
(key 20) on the diaphragm assembly (key 5). Insert
the cap screws (key 14).
10. Tighten all cap screws until nger tight. Then,
following a crisscross pattern, tighten each
cap screw.
11. Connect the control piping to the control connection
in the bonnet.
12. Adjust the spring by following the procedures in the
Spring Adjustment section, and remark the
nameplate if necessary.
1. Trademark of Never-Seez Corporation.
2. Trademark of Dow Corning Corporation.
(36 Seiten)
(1 Seiten)
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