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11
CAUTION!
It is
extremely important
to follow these steps to
ensure maximum valve performance.
THIS WILL AFFECT THE VALVE WARRANTY.
!
VERIFY BOLTING TORQUE
After the first exposure to elevated temperature and
the valve has completely cooled-down, verify bolting
torque at these locations:
1
Packing gland flange
2
Body to end connection
3
Actuator to valve mounting (if present)
Check the bolting at these same locations periodically.
CAUTION!
If bolting torque is lower than specified values on
the
test certificate
provided for each
individual
valve serial number, re-torque bolting as necessary.
THIS WILL AFFECT THE VALVE WARRANTY.
!
OPEN / CLOSE VALVE REGULARLY
Valves remaining
open
or
closed
for a long period of
time should be cycled
open
/
closed
at least once a
year.
Valves should always be
fully opened
and
fully
closed
to wipe away any accumulation on the sealing
surfaces.
ACTUATOR LUBRICATION
Keep hydraulic, pneumatic and worm gear actuators
fully lubricated according to actuator manufacturer’s
specifications.
3
2
1
Maintenance