Instruction Manual
D102013X012
8560 Valve
June 2017
25
6. Line‐up both holes in the disc hub with the holes in the drive shaft (key 8). (Note: The hole in the drive shaft is off‐set
to prevent the shaft from being installed in the wrong position. Be sure the hole in the shaft is lined up with the hole
in the disc hub.)
7. Insert the hollow pins (key 9), into the disc hub as shown in figure 13.
Using the tool shown in figure 13, tap the hollow pin down into the disc hub and shaft until the hollow pin bottoms on
the stop in the disc.
8. Insert the taper pins (key 10) into the hollow pins. Using a flat end punch, drive the taper pins into the hollow pins
until solid contact is felt. Anchor the pins in place by staking them with a center‐punch and hammer. The disc and
shaft should rotate smoothly.
9. Install the seal ring assembly using the appropriate instructions in the Seal Ring Maintenance procedures.
10. Install the packing parts using the appropriate instructions provided in the Packing Maintenance procedures. Refer
to the Actuator Mounting procedures before installing the valve in the pipeline.
Disc, Shaft Assembly and Bearing Maintenance for NPS 2
This procedure is to be performed to replace the valve disc, shaft, and taper pin assembly if the disc does not rotate in
response to rotation of the actuator end of the valve shaft. Unless otherwise indicated, part key numbers are shown in
figure 15.
Disassembly
1. Remove the seal ring according to steps 1 through 5 of the Replacing Seal Ring section.
CAUTION
Use a wheel puller to separate actuator parts from the valve shaft. Driving the parts off the valve shaft could move the valve
bearings and disc away from the centered position, damaging the disc and valve body.
2. Remove the cap screws and, if used, the hex nuts. Remove the clamp if the strap is used. Remove the actuator from
the valve body while referring to the separate actuator instruction manual for assistance.
3. Rotate the disc (key 3) to the fully open position.
4. Locate the half of the disc that has two C markings cast into it as shown in figure 10. Drive the two taper pins (key
3C) out toward the C‐marked side of the disc. Attempting to drive the taper pins in the opposite direction only
tightens the pins.
5. Unscrew and remove the packing flange nuts (key 101), packing followers (key 114), and packing flanges (key 102)
if used, from both sides of the valve.
WARNING
Once the shaft has been removed in the following step, the disc may fall from the valve. To avoid personal injury and disc
damage, support the disc to prevent it from falling as the shaft is being removed.
6. Pull the shaft out through the actuator side of the valve.
7. Remove the disc from the valve body.
8. Remove the packing rings (key 108), the packing washers (key 115) if used, and the packing box ring (key 107).
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