Anti-Blowout Design, Packing, Valve Shaft, Disk, And Bearing Maintenance - Emerson Fisher Control-Disk NPS 14 CL150 Instruction Manual

Control-Disk NPS 14-36
April 2011
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.
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 disk clockwise to meet the seal.
8. Adjust the actuator to bring the disk to the fully closed position at the end of the actuator stroke. To determine the
fully closed disk position, measure the distances between the disk face and the seal retainer face at the top and
bottom of the valve (X1 and X2) as shown in figure 3. Adjust the actuator to rotate the disk slightly until the two
measurements are within 0.8 mm (0.032 inch) of each other. Refer to the appropriate actuator instruction manual
for assistance.
9. The final seating of the retaining ring screws can now be done. For the screw torque values, refer to table 6.
Anti‐Blowout Design, Packing, Valve Shaft, Disk, and Bearing
Maintenance
Note
The Control-Disk valve has a two‐piece shaft. In these procedures, the shaft (with the splined end) is called the upper shaft (key 3).
The shaft opposite the upper shaft is called the lower (follower) shaft (key 4).
CAUTION
When removing the actuator from the valve, do not use a hammer or similar tool to drive the lever off the valve shaft.
Driving the lever or actuator off the valve shaft could damage the valve internal parts.
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Instruction Manual
D103545X012