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8580 Valve
April 2020
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 8. For assemblies 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 7. 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 October 2015 and utilize only one pin connection. NPS
8-12 valves shipped prior to October 2015 used a two-piece, split-shaft design with two pin connections - same as
the NPS 2-6 valves.
Figure 7. Taper / Expansion Pin Installation
NOTES:
1
INSTALL THE PINS FROM THIS SIDE OF THE DISK.
4. Reinstall the follower spring/spring seat assembly (keys 9, 12, and 9, figure 9) 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:
Table 8. Recommended Actuator‐Mounting Bolt Torque
DN
50, 80, 100, and 150
200, 250, and 300
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.
16
VALVE SIZE
NPS
2, 3, 4, and 6
8, 10, and 12
Instruction Manual
TAPER/EXPANSION PIN LOCATION
1
TORQUE
NSm
120
250
D103300X012
lbfSft.
88
185
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