Type A31A
12
Novex Seal and Phoenix III Fire-Tested
Seal Installation
Unless otherwise indicated, key numbers and part
names are listed in figure 8.
A maintenance kit with installation tools is available
through your Fisher Controls representative or sales
office.
1. Locate the replacement seal ring (key 5) and note
the shape of the ring. The ring is wider across one
edge diameter and narrower across the other edge
diameter. Also, note the wide groove around the out-
side circumference.
Before installing the seal ring into the valve body,
place the backup ring (key 6) into the wide, outer
groove of the seal ring.
2. Install the seal ring and backup ring assembly in
the valve body. The wider outside diameter of the seal
ring goes into the T-slot area of the valve body as
shown in figure 6. Start the edge with the wider diame-
ter into the T-slot of the valve body using a blunt-end
screwdriver. If a maintenance kit is available, use the
seal ring installation tools. Do not use the screwdriver
or seal ring tool directly on the metal seat. Use the tool
only on the backup ring.
3. Carefully tuck the backup ring downward into the
valve body T-slot until the seal ring and backup ring
are completely entrapped in the valve body T-slot.
Note
On larger valves, it may be more effi-
cient to have someone hold down the
seal ring while you push the backup
ring into the T-slot.
4. Once the seal ring and backup ring have been fully
installed into the valve body T-slot, the retaining ring
gasket can be installed. This gasket is a thin graphite
material. Use extreme care to avoid damaging the
gasket while punching one initial screw hole through
the gasket for alignment.
5. Install the retaining ring, and align the screw holes
in the retaining ring with the holes in the valve body.
Install the first retaining ring screw through the
punched hole in the retaining ring gasket. Install the
other retaining ring screws by pushing them through
the graphite gasket and threading them into the valve
body.
6. Tighten the retaining ring screws just enough to
eliminate any movement of the retaining ring. Do not
over-tighten the retaining ring screws.
Figure 6. Typical Seal Installation
A5251-1*/IL
WARNING
Avoid personal injury or property dam-
age caused by the impact of a falling or
tipping valve. Support large valves dur-
ing maintenance.
7. To complete this step, stand the valve up. Support
the valve securely using methods appropriate for the
valve size. If a vise or other clamps are being used,
make certain the flange gasket sealing area of the
valve body is not damaged.
8. Manually rotate the drive shaft (key 3) to turn the
disk clockwise to meet the seal ring.
9. Place a piece of rubber, or other soft material, be-
tween the disk and internal travel stop to protect the
disk. With a rubber mallet, tap the disk until it contacts
the internal travel stop. When the disk makes contact
with the stop, manually rotate the disk counterclock-
wise back out of the seal ring to a 90-degree open
position.
10. The final seating of the retaining ring screws can
now be done. For the screw torque values, refer to
table 6.
11. Repeat steps 8 and 9 two more times.
Note
When attaching the actuator to the
valve, make sure the valve disk is not in
contact with the internal travel stop. The
valve disk should be positioned from
0.001 to 0.030 inch (0.03 to 0.76 mm)
away from the internal stop in the valve
body.
