10
KTM
VIRGO SERIES E & U TOP ENTRY TRUNNION BALL VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
11.2 Notes
• Ensure clean environment during
disassembly and re-assembly of valve.
• Use appropriate material handling / lifting
equipment. Refer handling section of
this IOM.
• Prior to disassembly, it is recommended to
mark mating parts like body and bonnet,
bonnet and housing, gear operator or
actuator and ISO pad or housing to ensure
same orientation during re-assembly.
• Before disassembly, it is recommended to
keep the ball in fully closed position and then
remove the operator from valve assembly.
• Valve shall be positioned on clean and flat
surface as shown in Figure 14.
• It is recommended to use original spares.
- Graphite gaskets shall be replaced.
- Elastomer and plastomer seals can be
re-used, however it is recommended to
replace them to maximize valve service life.
• Protect every sealing surface from nicks,
dents and damages.
• Lubricate the o-ring and seals and lip seals
before re-assembly.
• During re-assembly, refer to tables in
Section 14 of this IOM for recommended
tightening torques.
• Assembly drawing shows the standard
configuration for valve with o-ring seals but
can be considered as a reference for lip-seal
configuration also.
FIGURE 14
