5
KTM
VIRGO SERIES N TRUNNION MOUNTED BALL VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
5 GEAR OPERATOR INSTRUCTIONS
5.1 Assembly of gear operator with bracket
and coupling
• It is recommended that the valve should
be kept in upright position (stem vertical).
• Valve shall be fully open.
• Place the bracket over valve top mounting
flange and fasten it with suitable fasteners.
Refer to tables in Section 14 of this IOM for
recommended tightening torques.
• Fit the key in stem keyway slot and then
mount coupling over stem.
• Fit the key in the coupling keyway slot and
assemble the gear operator on the bracket
with suitable fasteners ensuring that gear
operator position indicator matches the
open position of the valve.
• Gear operator setting should be done as
given in Section 5.3.
5.2 Assembly of gear operator without
bracket and coupling
• It is recommended that the valve should
be kept in upright position (stem vertical).
• Valve shall be fully open.
• Fit the key in the stem keyway slot and mount
the gear operator on valve top mounting
flange and fasten it with suitable fasteners
ensuring that gear operator position indicator
matches the open position of the valve.
Refer to tables in Section 14 of this IOM
for recommended tightening torques.
• Gear operator setting to be done as given
in Section 5.3.
5.3 Procedure for gear operator setting
CAUTION
If the valve has been supplied by Emerson with
the gear operator assembled on the valve -
open / close adjustment has been done prior
to shipment and must not be changed. In case
of gear operator replacement or mounting of
new gear operator on bare shaft valve, the steps
below shall be followed.
• Figure 14 shows the open and close positions
of position indicator, adjustment bolts and
lock nuts.
• Loosen the lock/check nut and unscrew
both left and right side bolt by minimum
one rotation.
• Match ball bore with valve bore. Fully tighten
the right-side bolt and then tighten the lock
nut.
• Rotate the ball by 90 degrees. Fully tighten
the left-side bolt and then tighten the
lock nut.
5.4 Possible orientations of gear operator
Figure 15 below illustrates the two possible
orientations for a gear operator when
assembled together with the Virgo Series N
trunnion mounted ball valve.
FIGURE 12
FIGURE 13
Handwheel
Handwheel
Position indicator
Position indicator
Gear operator
Gear operator
Coupling key
Stem key
Stem key
Stem
Coupling
Bracket
Assembly with bracket and coupling
Assembly without bracket and coupling
FIGURE 14
Open position
Close position
Adjust right bolt for open position
Adjust left bolt for close position
Lock nut / check nut
Gear operator setting
FIGURE 15
Orientation 1
Pipe line axis
Pipe line axis
Orientation 2
