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KTM VIRGO SERIES E & U TOP ENTRY TRUNNION BALL VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
11 DISASSEMBLY AND RE-ASSEMBLY
Sections
11.1
Warnings
11.2
Notes
Series EL and UL – Top entry Soft /
11.3
Metal Seated Trunnion Ball Valve
Construction: One-Piece
Type: Integral trunnion
11.3.1 Disassembly procedure
11.3.2 Re-assembly procedure
11.3.3 General arrangement view
11.3.4 Assembly tool
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.
• Ball valves can retain pressure and process
fluid in cavity 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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