Instruction manual

Instruction Manual
D500240X012
A31A Valve
October 2012
15
1. Locate the replacement seal ring (key 5) and note the shape of the ring. The ring is wider across one edge diameter
and n arrower across the other edge diameter. Also, note the wide groove around the outside circumference.
Before installing the seal ring into t he 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 diameter 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.
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.
4. Completely seat the seal ring in the valve body T-slot. Re-install the retaining ring (key 18) and retaining ring screws
(key 19). Tighten t he screws just enough to eliminate any movement of the retaining ring. Using a blunt-end tool,
carefully tuck the lip of the seal ring under the retaining ring.
5. When the seal ring is under the lip of the retaining ring, tighten the screws according to standard procedures. Do
not fully torque screws at this time. Final tightening of the screws is accomplished in step 7.
6. Manually rotate the drive shaft (key 3) clockwise 180 degrees to return the disk (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 completely installed and t he valve may be placed in service.
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 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 n arrower across the other edge diameter. Also, note the wide groove around the outside circumference.
Before installing the seal ring into t he 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 diameter 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 efficient to have someone hold down the seal ring w hile 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.