Instruction Manual

Instruction Manual
D103545X012
Control-Disk NPS 14-36
April 2011
14
2. Lay the valve flat on a work bench in a secure position with the retaining ring (key 18) and retaining ring screws (key
19) facing up. Properly secure the valve on a suitable worktable so it cannot slip, twist, or fall during maintenance.
Remove all retaining ring screws.
3. Remove the retaining ring by placing a socket head cap screw from the retaining ring in each of the two retaining
ring jacking screw holes. Slowly turn the screws until the retaining ring has been lifted from the valve body. Remove
the retaining ring to expose the seal in the T‐slot area of the valve body.
Note
The Control-Disk valve is available with different seal designs and components. See figure 2 to identify the specific seal design.
CAUTION
In the following procedure, take care not to damage the seal or T‐slot area of the valve body during removal of the seal.
4. Insert a regular screwdriver or other similar tool under the top edge of the seal and gently pry the seal out of the
T‐slot area in the valve body. Take care not to damage the seal or T‐slot area of the valve body. After the seal has
been removed, clean the T‐slot area, retaining ring and, if required, polish the disk (key 2) thoroughly with fine steel
wool or other appropriate material.
To install a new seal, O‐ring (key 6), and retaining ring gasket, follow the appropriate instructions given below.
Table 6. Torque Values for Fasteners
FASTENER NOMINAL SIZE
RETAINING RING SCREWS GASKET RETAINING BOLTS
NSm InSlbs NSm InSlbs
#10 4.6 41 4.0 35
1/4 11 100 9.2 81
5/16 25 220 19 167
3/8 45 400 33 295
NSm ftSlbs NSm ftSlbs
7/16 72 53 53 39
1/2 112 83 80 59
9/16 161 119 117 86
5/8 225 166 161 119
3/4 401 296 286 210
7/8 651 480 447 330
1 976 720 651 480
1‐1/8 1356 1000 837 617
Note: These values are based upon standard materials, S66286/N07718 screws and ASTM A193GRB6 bolts. For other special fastener materials, please contact your Emerson Process
Management sales office.
PTFE Seals
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. Around the outside circumference is one wide groove.
Before installing the seal ring into the valve body, place the O‐ring (key 6) into the wide, outer groove of the seal ring.
Refer to figure 8.
2. Install the seal ring and O‐ring assembly in the valve body. The wider outside diameter of the seal ring goes into the
T‐slot area of the body (see figure 5). Start the edge with the wider diameter into the T‐slot of the valve body using
a blunt‐end screwdriver. If you have a maintenance kit, use the seal installation tools.