Instruction manual

A31A Valve
Instruction Manual
Form 5291
March 2008
14
6. Manually rotate the upper shaft clockwise 180
degrees to return the disc (key 2) to its closed
position.
7. The final seating of the retaining ring cap screws
can now be done. For the screw torque values, refer
to table 6. The seal is now fully installed. Refer to the
Installation procedures in this manual.
NOVEX, Phoenix III and/or Phoenix III
Fire-Tested Seals
A maintenance kit with installation tools is available
through your Emerson Process Management 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 as shown in figure 8. Around the outside
circumference is one wide groove.
Install the seal ring (key 5) in the valve body by first
placing the wider outside diameter of the seal ring
into the T-slot area of the valve body which is shown
in figure 3.
The backup O-ring (key 6) for the Phoenix III seal
will have to be installed after placement of the seal
ring in the valve body using a blunt-end screwdriver
or the seal installation tool in the maintenance kit. Do
not use the screwdriver or seal tool directly on the
metal seat. Use tools on the O-ring only.
2. With the seal ring inserted all the way around the
body T-slot now lay the O-ring into the opening
between the valve body and the seal ring. Use the
seal tool to apply pressure to the O-ring and
carefully tuck the O-ring down into the T-slot
between the valve body and the seal ring.
Note
On larger valves, it may be more
efficient to have someone hold down
the seal ring while you push the O-ring
into the T-slot.
3. Once the seal ring and backup O-ring have been
fully installed into the body T-slot, the retaining ring
gasket can be installed. This gasket is a thin
graphite material. Punch one initial screw hole
through the gasket for alignment, being careful not to
cause additional damage to the gasket.
CAUTION
The retaining ring gasket is a thin
graphite material. When you punch
one initial screw hole through the
gasket for alignment, be careful not to
cause additional damage to the gasket.
4. 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 ring gasket. Install the other ring
screws by pushing the screws through the graphite
gasket and threading them into the valve body.
5. Tighten the retaining ring socket head cap screws
just enough to eliminate any movement of the
retaining ring. Do not over-tighten the retaining ring
screws.
WARNING
Avoid personal injury or property
damage caused by the impact of a
falling or tipping of a large valve.
Support large valves during
maintenance.
6. 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, be sure to not damage the
flange gasket sealing area of the valve body.
7. Manually rotate the upper shaft (key 3) to turn the
disc clockwise to meet the seal.
8. Tap the disc with a rubber mallet to drive it
against the internal travel stop. When the disc
makes contact with the stop, manually rotate the
disc counterclockwise back out of the seal to a
90-degree open position. Repeat steps 7 and 8 three
times.
Note
When attaching the actuator to the
valve, make sure the valve disc is not
in contact with the valve internal travel
stop (see figure 8). The valve disc
should be positioned from 0 to 0.76
mm (0 to 0.030 inch) away from the
internal stop in the valve body (see
figure 8).
9. Use an appropriate tool (such as a feeler gauge)
to position the disc (key 2) from 0 to 0.76 mm (0 to
0.030 inch) away from the internal stop in the valve
body.