6
KTM
VIRGO SERIES N TRUNNION MOUNTED BALL VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
6 EMERGENCY SEALANT INJECTION SYSTEM
Typically provided on DN 150 (NPS 6) and larger
valves
• Emergency Sealant injection system is
provided on valve seat and/or stem packing
area to temporarily reduce seat leakage when
the valve is in the closed position or to reduce
packing leakage.
• Typically, for valve size DN 350 (NPS 14) and
above, 1 sealant injection fitting is provided
for stem and 2 fittings for each seat. For valve
sizes DN 300 (NPS 12) and below, 1 sealant
injection fitting is provided for stem and
1 fitting for each seat.
• This emergency sealant injection system
is to be used only when valve is not able to
achieve the desired shutoff due to damage /
wear and tear on the seats and seals and it is
not possible to take the valve off the line for
repair and maintenance.
• Always flush the sealant port with suitable
cleaner/solution, before injecting sealant.
Sealant / cleaning agents shall be selected
based on service fluid / condition.
References can be drawn from
manufacturers like Climax Lubricants and
Equipment Co
®
, Sealweld
®
etc.
Sealant injection fitting - Type A
(standard supply)
See Figure 16
Seat sealant injection
• Fully close the valve.
• Remove the fitting end cap and slide
giant buttonhead coupler (Climax
®
model
1699/1700) on sealant fitting. Inject sealant
into each of the sealant fitting. Injection
pressure shall be more than pipeline
pressure but shall not exceed 1.5 times the
pipeline pressure at operating temperature.
• Fully open the valve. Inject sealant into each
of the sealant fitting.
• Again, close the valve to uniformly distribute
the sealant over the ball surface.
• Repeat above steps multiple times until
desired sealing is achieved. Ensure last
injection is always made with valve in close
position.
Stem sealant injection
• Remove the fitting end cap and slide giant
buttonhead coupler on sealant fitting. Inject
sealant into the sealant fitting. Injection
pressure shall be more than pipeline
pressure but shall not exceed 1.5 times the
pipeline pressure at operating temperature.
• Cycle valve once to uniformly distribute the
sealant around the stem.
FIGURE 16
Sealant injection fitting - Type A (standard supply)
Check valve
Sealant fitting
Type A (marking)
Slot for sealant gun adapter
Body / adapter / housing
End cap
Giant buttonhead coupler
