Instruction Manual
D103545X012
Control-Disk NPS 14-36
April 2011
18
6. The gasket retainer (key 20) on the side of the valve opposite the upper shaft must be removed before removing
the lower shaft.
Remove the hex head bolts (key 23) and lockwashers (key 22) from the gasket retainer and remove the gasket retainer
and gasket (key 21) to expose the end of the lower shaft.
7. Before removing the lower shaft (key 4), be sure the valve disk is properly supported. Pull the lower shaft from the
valve body. Use a shaft extractor screwed into the puller hole in the end of the lower shaft.
8. Before removing the upper shaft (key 3), be sure the valve disk is properly supported. Pull out the upper shaft (key
3) by hand‐pulling or by using a shaft extractor screwed into the end of the shaft.
CAUTION
To avoid damage to the disk, seal, and T‐slot area, do not force the disk past the seal or T‐slot area. Remove the disk from
the opposite side of the valve body.
Note
Both the upper shaft and the lower shaft have a thrust bearing (key 24) between the disk and the bearings (key 7). The thrust
bearing is located outside of the bearing bore which holds the bearings. Use care when removing the valve disk to avoid loss of or
damage to the thrust bearings.
9. After removing the shaft(s), remove the disk. Do not force the disk past the seal or T‐slot area. Collect the thrust
bearings.
10. Remove the bearings (key 7). Using a suitable punch or puller, drive or pull the bearings into the valve body bore
from the upper shaft bearing bore. Remove the bearing from the lower shaft bearing bore.
11. Inspect the valve body bore, bearings, bearing bores, and packing box for damage.
Note
In these instructions, the drive shaft (with splined end) is called the upper shaft (key 3). The shaft opposite the upper shaft is called
the lower (follower) shaft (key 4).
Installing the Two‐Piece Shaft
Key numbers in this procedure are shown in figure 9 unless otherwise indicated.
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.
1. Properly secure the valve on a suitable worktable so it cannot slip, twist, or fall during maintenance. Be prepared to
support the valve disk.
Note
Replacement disk and shafts are provided as a matched set and both should be replaced at the same time.
