4
KTM
VIRGO SERIES N TRUNNION MOUNTED BALL VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Installation of valve in vertical pipeline
• Place the valve with end flange resting on
‘soft’ surface like rubber sheets or wooden
planks free of dirt/debris/hardware like nails
and moisture.
• Hook the valve at end flange bolt holes as
shown in Figure 10 and lift with the help of
suitable crane.
• Alternately, valve can be lifted with the help
of fork lift as shown in Figure 11.
• Mount the valve on the pipeline end flange
with the flange gaskets appropriate for the
application and assemble with suitable
fasteners.
• Refer to tables in Section 14 of this IOM for
recommended tightening torques.
• Do not allow valve body temperature in seat
area to exceed 200 °F (94 °C) during welding
of valve to the pipeline in case of butt weld
end valves.
FIGURE 9
FIGURE 10
Lifting hooks
Forklift lifting location
Valve end flange
Valve end flange
OR
Valve
Valve
Pipeline end flange
Pipeline end flange
WARNING
Do not mount
in this position
FIGURE 11
4 OPERATION
• For lever operated valve, the lever is either
shipped loose or assembled with valve
depending upon the size of the valve / lever.
Rotation of lever in the clockwise direction
closes the valve and counter clockwise
rotation opens the valve.
• For gear operated valve, the gear operator
open / close adjustment has been done
prior to shipment and must not be changed.
Rotation of hand wheel in the clockwise
direction closes the valve and counter
clockwise rotation opens the valve.
• It is recommended that the valve should
be opened and closed slowly to prevent
hammering effect on the valve and pipeline.
• If the valve is not operating to fully open or
fully close position and/or leaking, do not
apply excessive force to operate the valve.
This can damage the valve internals and/or
the operator parts.
• Do not apply extra force using inappropriate
extensions to levers and handwheel like pipes
or bars.
Note:
international standards typically restrict
the input force on lever/handwheel rim to
max. of 360N and the valves are designed
accordingly.
• For valve with pneumatic and gas actuator,
do not exceed the operating pressure of
actuator.
• Always use dry, moisture free air while
operating the valve with pneumatic actuator.
