Fisher Control-Disk Instruction Manual page 15

Instruction Manual
D103298X012
CAUTION
To avoid possible product damage, ensure the bearing tabs are oriented correctly when installing in the following
procedure. See figure 5 for proper orientation of the bearings.
1. If new bearings (key 6) are required, install and orient them in the valve body, as shown in figure 5. Ensure the
bearings are fully seated, contacting the inside diameter of the valve body.
2. Insert the disk into the valve body as shown in figure 6, ensuring the "T" stamped on the disk hub is oriented toward
the actuator end of the valve body.
3. Install the drive shaft (key 10) through the valve body into the disk. The disk/shaft connection utilizes taper and
expansion pins. The hole for the drive shaft connection is slightly off‐center to prevent the drive shaft from being
installed in the wrong orientation. Orient the position indication mark on the end of the shaft with the face of the
disk as shown in figure 7. For valves using a two-piece, split-shaft, the hole for the follower shaft connection is
on‐center. Insert the expansion pins into the disk until they are seated, as shown in figure 6. Once in place, insert
the taper pins. The taper pins must be driven into the disk/shaft/expansion pin assemblies until "solid contact" is
felt. "Solid contact" can be identified by the sound of the hammer blow and the bounce felt in the hammer. NPS
8-12 valves changed to a one-piece, through-shaft design in 2015 and utilize only one pin connection. NPS 8-12
valves shipped prior to 2015 used a two-piece, split-shaft design with two pin connections - same as the NPS 2-6
valves.
4. Reinstall the follower spring/spring seat assembly (keys 9, 12, and 9, figure 8) inside the follower shaft or follower
side of the drive shaft for valves with a one-piece, through-shaft design.
5. Install the spacer (key 15) if used, and the gasket, blind flange, and hex nuts (keys 16, 17, and 19). Ensure the blind
flange is oriented so the serrations face the gasket and valve body. Tighten the hex nuts (key 19) per table 7.
6. The valve must be closed during seal ring installation to permit accurate centering of the seal. To install the new
seal ring assembly or flow ring:
D For a soft seal, if the spring (key 5) was disassembled, hook the spring ends together. Work the spring into the
recess in the seal ring (key 4). Place the seal ring assembly onto the disk. Set the retainer onto the seal, making sure
proper alignment between the seal and retainer has been achieved.
D For the metal seal ring assembly, place the seal ring assembly onto the disk. Set the retainer onto the seal.
D For the flow ring construction, place the gasket (key 41) onto the valve body. Set the retainer onto the gasket.
7. Attach the seal retainer (key 2) and the retainer clips (key 13) to the valve body and secure with the machine screws
(key 14).
8. Insert a packing box ring (key 23) into the packing box.
9. For standard packing, install the packing according to the appropriate instructions presented in step 5 of the
Replacing Packing section on page 11 of this manual.
For ENVIRO‐SEAL packing, install the new packing system components as described in the ENVIRO‐SEAL Packing
System for Rotary Valves Instruction Manual (D101643X012).
10. Install the anti‐blowout ring (key 40) in the groove in the drive shaft.
11. Rotate the disk to the approximate closed position.
12. Mount and adjust the actuator per the following Actuator Mounting section on page 18 of this manual.
Control-Disk Valve
June 2017
15