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KTM VIRGO SERIES N TRUNNION MOUNTED BALL VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
11 DISASSEMBLY AND RE-ASSEMBLY
Sections
11.1
Warnings
11.2
Notes
Series N trunnion mounted ball
11.3
valve with gland
Construction: Two-Piece
Type: External trunnion
11.3.1 Disassembly procedure
11.3.2 Re-assembly procedure
11.3.3 Exploded view
Series N trunnion mounted ball
11.4
valve with gland
Construction: Two-Piece
Type: Support plate
11.4.1 Disassembly procedure
11.4.2 Re-assembly procedure
11.4.3 Exploded view
Series N trunnion mounted ball
11.5
valve without gland
Construction: Two-Piece
Type: External trunnion
11.5.1 Disassembly procedure
11.5.2 Re-assembly procedure
11.5.3 Exploded view
Series N trunnion mounted ball
11.6
valve without gland
Construction: Two-Piece
Type: Support plate
11.6.1 Disassembly procedure
11.6.2 Re-assembly procedure
11.6.3 Exploded view
Series N trunnion mounted ball
11.7
valve without gland
Construction: Three-Piece
Type: Support plate
11.7.1 Disassembly procedure
11.7.2 Re-assembly procedure
11.7.3 Exploded view
11.1 Warnings
For removal of valve from pipeline, disassembly,
re-assembly
• Pay attention to prevent personal injury or
equipment damage from sudden release of
process pressure or uncontrolled movement
of parts.
• Always wear PPE like protective gloves,
safety shoes, helmet, clothing, eyewear and
other PPE as mandated by site/project when
performing any maintenance operations to
prevent personal injury.
• Do not remove the operator from the valve
while the valve is still pressurized.
• In case of an actuated valve, before removal
of actuator, disconnect any operating lines
providing air pressure, electric power, or a
control signal to the actuator. Be sure the
actuator cannot accidently open or close the
valve.
• In case of spring return actuators ensure that
the spring is at its uncompressed position.
• Use bypass valves or completely shut off the
process to isolate the valve from process
pressure. Relieve process pressure from both
sides of the valve. Drain the process media
from both sides of the valve.
• Double block and bleed valves can retain
pressure and process fluid even after process
pressure has been removed from both sides
of the valve. Relieve this pressure before
disassembling or removing the valve from the
line. Take additional care if the process fluid
is hot, flammable, caustic, or hazardous.
• Carefully secure the valve in an upright
position. The roundness of the flanges and
valve body allow it to easily roll from side-
to-side. The combined weight of the valve
and actuator assembly could cause injury
or property damage when falling to the side.
• Use lock-out procedures to be sure that the
above measures stay in effect while you work
on the equipment.
• Exercise caution when working on the valve
stem packing as it may contain process
fluids that are pressurized, even when the
valve has been removed from the pipeline.
Process fluids may spray out under pressure
when removing the packing hardware or
packing rings.
• Prevent injury by keeping hands, tools and
other objects away from the ball while
stroking the valve.
• Check with your process or safety engineer
for any additional measures that must be
taken to protect against process media.
9
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