DeZURIK
November 2020
Page 27
D10322
Valve Disassembly
(Continued)
12. On larger sizes, remove the cover screws (A33), lockwashers (A32), cover (A31) and seal (A30)
from the bottom of the body.
13. Remove the disc pin
—see Figure 15 (page 29):
On valve sizes 2
–12" (50–400mm), remove the disc pin set screw (A24) and drive the disc
pin (A5) from the disc with a small punch. Do not damage the shaft with the punch.
On larger sizes, remove the two disc pins (A5).
14. Place the valve in a horizontal position with the seat side down.
15. While supporting the disc (A3), carefully pull the shaft (A4) from the body and remove the disc.
Bearing Replacement
FT Bearings (Options FT)
On valve sizes 2
–24" (50–600mm), the PTFE bearing option consists of two bearing carriers (A13),
each with a replaceable bearing liner (A7). Class 150 valve sizes 6" (150mm) and larger and Class 300
valve sizes 5" (125mm) and larger also include a thrust bearing (A8). See Figure 1 on page 6.
1. Remove the liners towards the flanged end of carrier and clean the carriers.
2. Place a new liner in each carrier from the flanged end.
Note:
To increase life, position the split in liner towards the side of the body rather than parallel
with the pipeline.
On valve sizes 30" (750mm) and larger, the 317 SST bearing option includes the two thrust bearings
(A8), but does not include the two bearing carriers (A13). The upper bearing (A7) and the lower bearing
(A40) are located in the shaft bore.
3. Remove the used bearings from the body and clean all contaminants from the bearing locations.
4. Place a new bearing at the same two locations in the body.
Note:
For increased life, position the split in the liner towards the side of the body rather than
parallel with the pipeline.
Nickel Stainless Bearings (Option NS)
The Nickel Stainless bearing option consists of two one-piece bearings (A2) pressed into the body.
1. Drive the used bearings out of the body.
2. Press the new bearings into position in the body.