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KTM VIRGO SERIES E & U TOP ENTRY TRUNNION BALL VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
11.3 Series EL and UL - top entry soft / metal
seated trunnion ball valve
Construction: One-piece
Type: Integral trunnion
Refer Section 11.3.3 for general arrangement
view and location of parts.
11.3.1 Disassembly procedure
1. Position the valve with ball in closed position
as shown in Figure 15.
2. Slowly remove the vent / drain plug (20)
to relieve any residual pressure from the
body cavity.
3. Remove the stem key (9) from the stem (5).
4. Remove cap-screws (14a).
5. Remove ISO pad (8).
6. Unscrew and remove body nuts (13) from
body studs (12).
7. Screw an eyebolt inside the tapping provided
on the top surface of the bonnet and lift
the bonnet-housing sub-assembly. Ensure
that stem will not fall while lifting bonnet-
housing assembly.
8. If it is necessary to replace the stem gasket,
follow instructions 9 to 11 below. Otherwise
donot disassemble the stem-bonnet sub-
assembly and go to instruction no. 12.
9. Push the stem (5) out of its housing on the
bonnet (2).
10. Remove stem o-rings (10c) and backup
rings (if provided) from bonnet and then
remove graphite stem gasket (11a).
FIGURE 15
FIGURE 16
11. Remove stem thrust washer (22) from the
stem.
12. Insert the two hydraulic pistons inside body
cavity and clamp the external profile of the
spring holder ring (3a) (Refer assembly tool
view 11.3.4 and Figure 15.
13. Close the hydraulic pistons together to pull
the seat spring holder rings towards center
of the valve.
14. Remove spacer (3b) from both spring holder
rings. (Refer Figure 16).
15. Use the hydraulic pistons to push spring
holder ring (3a) back inside body recess.
16. Remove hydraulic pistons from body cavity.
17. Rotate the ball (4) to fully open position
using two eye bolts screwed on ball.
18. Remove the ball from the body (1) using eye
bolts.
19. Remove seat assembly (3, 3a, 3b) from body.
20. Remove the Bearing Retainer (7), ball
bushing (21) and ball thrust washer (23)
from the body if provided.
21. Remove seat (3) from the seat spring holder
ring (3a).
22. Remove o-rings (10a, 10b) and its back-up
ring (if present) from seat and seat spring
holder ring.
23. Remove all the springs (15) from the seat
spring holder ring.
11
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