19
KTM
VIRGO SERIES N TRUNNION MOUNTED BALL VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
11.7 Series N trunnion mounted ball valve
without gland
Construction: Two-piece or three-piece
Type: Support plate
Refer Section 11.7.3 for exploded view and
location of parts.
11.7.1 Disassembly procedure
1. Position the valve vertically on 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 (08) and ISO pad (07).
Remove fasteners (09) and housing (06).
Remove O-ring (14) and gasket (15) from
housing.
4. Remove key (20 and 21). Remove the stem
(04) from 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 2
nd
or top adapter (02).
Remove O-ring (10) and gasket (11) from 2
nd
or top adapter.
6. Remove lock washer (35) and seat (05) from
2
nd
or top adapter. Remove O-ring (16) from
seat. Remove seat springs (25) from adapter
or seat.
7. Remove ball (03) along with support plates
(28). Remove support plates from ball.
Remove bearings (29) from support plates,
if it requires replacement due to wear /
tear / damage. Remove thrust washer (30)
from ball.
8. Remove nuts (19) and body (01) from 1
st
or
bottom adapter (02). Lifting lugs (27) can be
fastened at 180° apart using body top side
studs and nuts for lifting and removing the
body. Remove O-ring (10) and gasket (11)
from 1
st
or bottom adapter.
9. Remove lock washer (35) and seat (05) from
1
st
or bottom adapter. Remove O-ring (16)
from seat. Remove seat springs (25) from
adapter or seat.
10. Where applicable, the sealant injection
fittings (26) may be removed for cleaning.
11.7.2 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 1
st
or bottom adapter (02)
vertically by resting on end flange. Insert
springs (25) in 1
st
or bottom adapter or
seat (05). Mount O-rings / lip seals (16) as
applicable on seat and insert seat in 1
st
or
bottom adapter. Assemble lock washer (35)
to lock the seat in 1
st
or bottom adapter.
4. Place gasket (11) and O-ring (10) on 1
st
or
bottom adapter. Assemble the body (01)
such that dowel pins on body take guide of
dowel pin holes on 1
st
or bottom adapter.
Assemble lifting hooks (27) as applicable.
Tighten the nuts (19) in criss-cross pattern.
5. Assemble dowel pins (32) and bearing (29) in
support plates (28) and place them on ball
(03) along with thrust washers (30).
6. Place the ball along with support plates on
1
st
or bottom adapter seat such that ball is
in closed position.
7. Insert seat springs (25) in 2
nd
or top adapter
or seat (05). Mount O-rings / lip seals (16) as
applicable on seat and insert seat in 2
nd
or
top adapter. Assemble lock washer (35) to
lock the seat in 2
nd
or top adapter.
8. Place gasket (11) and O-ring (10) on 2
nd
or
top adapter. Assemble 2
nd
adapter such that
dowel pins on body take guide of dowel pin
holes on 2
nd
or top adapter. Assemble lifting
hooks (27) as applicable. Tighten the nuts
(19) in criss-cross pattern.
9. Place O-rings / lip seals (12) and bearing
(23) in housing (06).
10. Insert the stem (04) along with thrust
washer (24) in housing.
11. Assemble housing along with stem on body
using gasket (15), O-ring (14), fasteners (09)
and dowel (31).
12. Place gasket (13) between ISO pad (07)
and housing and assemble ISO pad using
fasteners (08) and dowel pins (33).
13. Assemble key (20 and 21) on stem.
14. Assemble drain / vent plug (22) as
applicable.
15. Assemble sealant injection fittings (26) as
applicable.
