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KTM VIRGO SERIES E & U TOP ENTRY TRUNNION BALL VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
11.3.2 Re-assembly procedure
1. Install all the springs (15) in spring holder
ring (3a) then put spacer (3b) on spring
holder ring and move till the end of spring
holder ring.
2. Assemble the spring holder ring over the
seat (3).
3. Install seat o-ring (10a) and retainer o-ring
(10b) with backup ring (if provided) on seat (3).
4. Insert seat assemblies inside the body (1)
and push them till the end of the pocket in
the body.
5. Install bearing retainer (if not integral with
body) (7), ball bushing (21) and ball thrust
washer (23) inside body.
6. Insert ball (4) inside body using eye bolt
screwed on ball, such that ball is in the open
position.
7. Rotate the ball to fully closed position.
Remove eye bolts.
8. Insert anti-static spring (15a) in the central
hole of the ball.
9. Using hydraulic pistons, pull the two seat
assemblies towards the ball.
10. Move spacer (3b) in the groove provided on
spring holder ring (3a).
11. Remove hydraulic pistons from body.
12. If the stem was disassembled from housing,
follow instructions from 13 to 16 otherwise
go to Section 17.
13. Insert stem thrust washer (22) over the
stem (5).
14. Insert stem o-rings (10c) along with backup
rings (10c) (if provided) inside the housing (6).
15. Install o-ring (10d) and graphite gasket
(11b) between housing (6) and bonnet (2).
Now fasten the housing to bonnet using
fasteners (14).
16. Insert stem inside the bonnet and housing
with respect to ball in the closed position.
While inserting stem inside the housing,
the edges of keyway slot may damage the
o-rings. Hence take suitable protection like
wrapping stem keyway side with common
adhesive tape.
17. Install o-ring (10) and graphite gasket (11)
between bonnet and body and fasten the
assembly using fasteners (12 / 13).
18. Install stem gasket (11a) inside housing and
then assemble the ISO pad (8) using cap
screw (14a) and pins (24). Install stem key (9).
19. Install the drain plug and vent plug and
injection fittings as applicable.
12
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