AOP D Series Installation, Operation And Maintenance Manual page 15

10. Remove the trunnion O-ring from the trunnion groove and the lower trunnion fire safe seal
from its housing in the body.
11. Remove the body stud nuts or, for the studded ends valve, the body capscrews.
12. Lift the closure off the body paying attention not to damage the soft seals.
13. Remove the closure O-ring from the groove on the closure and the closure fire safe seal from
its recess.
14. Pull the seat ring unit out of the closure, paying attention not to damage the soft seals.
15. Slip the seat O-ring off the seat ring.
CAUTION: The seal ring consists of an insert pressed into the seat ring by the manufacturer. Do
not attempt to remove the seat insert from holder.
16. Remove the seat springs from their housing in the closure.
17. Remove the ball from the body cavity.
18. Pull the trunnion bearing from the bottom of the ball.
19. Repeat steps 14-16 for removal of the body seat ring.
20. Remove the stem bearing (3) from the body stem bore.
21. Remove the drain fitting
CLEANING:
Remove any foreign and corrosive products within the body.
CAUTION: Abrasive cleaning could never be used, especially on sealing area. If water jetting is
used, dry with compressed air.
Clean all metallic parts with soft cloth saturated with a solvent. Observe all sealing surfaces.
Clean the grease fittings and if present the grease channels.
Clean the sealing rings and the gaskets with a soft cloth. If necessary, wash them with soap and rinse
them with clean water.
CHEMICAL RESISTANT VINYL OR RUBBER GLOVES SHOULD BE WORN DURING
CLEANING OPERATION
INSPECTION
After cleaning, all valve components should be inspected for damages, dents, scoring, wear or
corrosion. If any damage is found, proceed with the repair where possible, or with substitution of the
parts.
For a complete inspection procedure, the following operations shall be carried out:
1. Check the metallic parts for damage along the sealing surfaces and on moving surfaces.
Particular attention should be paid to surface nicks and corner damage.
2. Make sure that the sealing rings and gaskets are not slashed, extruded and/or otherwise
damaged.
3. Check for scratches, plating defects, the surfaces of the bearings, the thrust washers, the gland
bushing, the ball and the seat components.
4. Inspect all spares that are going to be used to ensure damage has not occurred in storage or
transportation.
MINOR REPAIRS
If any damage is found, the minor repairs should be carried out by trained persons, otherwise contact
TK representative.
The minor repairs that may be carried out on site by maintenance personnel shall be in accordance
with the following points:
1. Rectify by normal good engineering practice the damage on metallic surfaces.
2. Remove surface nicks on ball and stem by using a mild abrasive.
3. Remove all corner damages by using a mild abrasive or with a bearing scraper.
4. Replace all faulty parts and components.
Flush lube and sealant while the valve is disassembled.
IOM-BLV-D-006
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