Flowserve LY Series Limitorque - Manual (Page 57)

57
Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11
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Symptom Possible Cause Corrective Action
Motor overload tripping Excessive current draw Inspect valve for possible
causes of high running load. In
particular, check for excessive
tightness of valve packing and
for proper lubrication of valve.
Consult Flowserve for review of
application.
Incorrect overloads Verify proper overloads selected
for motor rating.
Excessive gear wear Excessive loads Verify actual loads are in
accordance with both start and
run capabilities of your actuator.
Inadequate lubrication Inspect quality and quantity of
lubrication in accordance with
Section 7.1, Lubrication.
Improper alignment Inspect worn gears for evidence of
uneven wear pattern.
Excessive torque required to turn
handwheel Valve running loads higher than
expected Inspect valve for possible cause of
high running loads. In particular,
check for excessive tightness of
valve packing, proper lubrication
of valve stem, bent or damaged
valve, tight Stem/Torque Nut fit,
worm, or damaged Stem Nut.
Unit is not properly aligned with
valve Take bolts off between the unit and
the valve and check for proper unit
alignment.
Oil leaking from unit Infrequent operation of actuator
resulting in grease separation Institute periodic operation of
unit into a maintenance program
to keep grease mixed. If not
possible, schedule more frequent
lubrication to ensure adequate
lubrication of gearbox.
Damaged or worn seals Replace seals.
Valve is closed, but flow is not
cut off Valve mechanical stops not set
correctly a. Do not set Torque Switch flow
is not cut off not set correctly
higher than maximum setting
defined by Torque Limiter Plate.
Inspect valve seat and repair as
required.
b. Check setting of Closed
Mechanical Stop.
c CAUTION: Most quarter-turn valves are position-seated, not
torque-seated. Applying additional torque to the hand-wheel
and/or repeated electrical bumping at the full closed position
may damage the valve and/or the actuator.