Instruction manual

Instruction Manual
D500248X012
A31D Valve
April 2014
19
b. After screwing the rod into the pin, slide the spacer over the rod and pin. Thread the nut onto the rod and tighten
it. As the nut is tightened, the nut will drive the spacer against the disk. The i ncreasing force will draw the pin
from the disk.
1. Valves with a two-piece shaft have a gasket retainer and gasket (keys 20 and 21) on the follower shaft side of the
valve. Remove the hex head bolts and lockwashers (keys 23 and 22) from the gasket retainer and remove the gasket
retainer and gasket to expose the end of the follower shaft.
2. Support the valve disk properly, and remove the follower shaft. Pull the follower shaft from the valve body. Use a
shaft extractor screwed into the puller hole in the end of the follower shaft.
3. Support the valve disk properly, and remove the drive shaft. Pull out the drive shaft (key 3) by hand-pulling or by
using a shaft extractor screwed i nto the end o f the shaft.
CAUTION
To avoid damage to the disk, seal ring, 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.
4. After removing the shaft(s), remove the disk and the thrust bearings. Do not force the disk past the seal ring or
T-slot area.
5. Remove the journal bearings (key 7). Using a suitable punch or puller, drive or pull the journal bearing(s) into the
valvebodyborefromthedriveshaftbearingbore.Donotattempttoremovethebearingstop(key8).Removethe
journal bearing from the follower shaft bearing bore.
6. Inspect the valve body bore, bearings, bearing bores, and packing box for damage.
Installing a One-Piece Shaft
Unless otherwise indicated, key numbers and part names are listed in figure 7.
1. Secure the valve in an upright position. Allow for easy access to the valve body bore. Allow for easy access to the
drive shaft bearing bore.
2. Inspect all parts removed from the valve for wear or damage. Replace any worn or damaged parts. Clean the valve
body and all parts to be installed with an appropriate solvent or degreaser.
CAUTION
Premature valve failure and loss of process control may r esult if bearings are improperly installed or are damaged during
installation.
3. Using caution to prevent damage to the bearing, insert one journal bearing (key 7) from the valve body bore into
the drive shaft bearing bore until it hits the bearing stop (key 8). When properly installed, a portion of the journal
bearing will extend into the valve body bore.
4. Insertonejournalbearingfromthevalvebodyboreintotheshaftbearingboreoppositethejournalbearing
installed in step 3. When correctly installed, this journal bearing will be flush with the valve body bore.
5. Installthevalvediskbyplacingthediskintothevalvebodyboresothecurvedsideofthediskpassesthroughthe
end of the valve body that does not contain the T-slot. Align the shaft bore in the disk with the bearing bores.
6. Insertthedriveshaftendoppositethesplinedendintothevalvebodythroughthepackingbox.Pushtheshaft
through the bearing stop. Taking care not to dislodge the journal bearing, push the shaft through the journal
bearing and the valve disk and into the bore on the opposite side of the valve body.