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KTM VIRGO SERIES N TRUNNION MOUNTED BALL VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
11.6 Series N trunnion mounted ball valve -
without gland
Construction: Two-piece
Type: Support plate
Refer Section 11.6.3 for exploded view and
location of parts.
11.6.1 Disassembly procedure
1. Position the valve vertically by resting body
side end flange as shown in Figure 17.
2. Slowly remove the vent / drain plug (22) to
relieve any residual pressure from the body
cavity.
3. Remove fasteners (09) and ISO pad (07).
Remove fasteners (08) and housing (06).
Remove O-ring (14) and gasket (15) from
housing.
4. Remove key (20 and 21). Remove the stem
(04) from the housing. Remove O-ring (13)
from housing. Remove bearing (23) from
housing, if it requires replacement due
to wear / tear / damage. Remove thrust
washer (24) from stem.
5. Remove nuts (19) and adapter (02). Where
threaded "Puller Holes" are provided on
adapter flange, appropriate fasteners can be
used to gradually separate the adapter from
the body before lifting. This can be done by
screwing the fasteners in the puller holes
until they touch the body face and thereby
pulling adapter away from the body. The size
of the puller hole threading is same as that
of the fastener (09) size of body to housing
joint. Remove 'O'-ring (10) and gasket (11)
from adapter.
6. Remove lock washer (34) and seat (05) from
adapter. Remove O-ring (13) from seat.
Remove seat springs (25) from adapter
or seat.
7. Remove ball (03) along with support plates
(28) from body. Remove support plate from
ball. Remove bearings (29) from support
plates, if it requires replacement due
to wear / tear / damage. Remove thrust
washer from ball.
8. Remove seat (05) from body. Remove O-ring
(13) from seat. Remove seat springs (25)
from body or seat.
9. Where applicable, the sealant injection
fittings (26) may be removed for cleaning.
11.6.2 Re-assembly procedure
1. Ensure all parts are clean prior to assembly
of the valve.
2. Pay attention to references marked during
disassembly.
3. Position the body (01) vertically by resting
on end flange. Insert springs (25) in body or
seat (05). Mount O-rings / lip seals (16) as
applicable on seat and insert seat in body.
4. Assemble dowel pins (32) and bearing (29)
in support plates (28) and place them on
ball (03) along with thrust washers (30).
5. Place the ball along with support plates in
the body such that ball is in closed position.
6. Insert springs (25) in adapter (02) or
seat (05). Mount O-rings / lip seals (16)
as applicable on seat and insert seat in
adapter. Assemble lock washer (34) to lock
the seat in adapter.
7. Place gasket (11) and O-ring (10) on adapter.
Place the adapter assembly on body such
that dowel pins (32) take guide of dowel pin
hole on adapter. Assemble lifting hooks (27)
as applicable. Tighten the nuts (19) in criss-
cross pattern.
8. Place O-rings (12) and bearing (23) in
housing (06).
9. Insert stem (04) along with thrust washer
(24) in housing.
10. Assemble housing along with stem on body
using gasket (15), O-ring (14), fasteners (08)
and dowel (31).
11. Place gasket (13) between ISO pad (07)
and housing and assemble ISO pad using
fasteners (09) and dowel pins (33).
12. Assemble key (19 and 20) on stem.
13. Assemble drain / vent plug (22) as
applicable.
14. Assemble sealant injection fittings (26)
as applicable.
17
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