Document No：KE-4032-02 Page：18/19
5-2. Trouble Shooting
The following table provides the general guidance of remedial and preventive measures to
settle technical problems which may occur on site during operation of actuated ball valves.
For further technical assistance, contact KITZ Corporation or your local KITZ distributors or
agents.
Categories
of failures
Causes of failures
Remedial measures
Preventive measures
Control
circuit
failure
・Discrepant power
supply
・Replacing actuators,
if subjected to
voltage higher than
design specification
・Correct power supply
・Discrepant control
circuitry
・Inadequate contact
between terminals
・ Replacing
actuators, if
corrective measures
could not solve the
problem
・Checking correct circuitry
with operation manual
・Correct and secured
terminal connections
Actuator failures
Damaged or
deteriorated
actuator
parts
・Water intrusion into
actuator interior
・Submerged actuator
・Improper mounting
orientation
・Inadequate
waterproofing for
exposed ends of cables
・Product
replacement
・No installation in an
environment with risk of
submerging
・Mounting with correct
orientation
・Adequate waterproofing
with gap fillers and plastic
tapes
・Excess pressure rise of
valve cavity or piping
pressure
・Replacing valves, if
pressure reduction
could not solve the
problem
・Prevention of excessive
body cavity or piping
pressure, referring to
the valve operation
manuals
・Pipe sealing materials
stuck to valve seats
・Replacing valves
・Proper, non-excessive
application of sealing
material
・ Foreign objects stuck
to
valve seats
・Replacing valve
seats,
or valves
・Mounting a strainer on the
upstream piping
・Sufficient care for piping
flush before a loop test
・Corroded ball
・Replacing balls, or
valves
・New materials suitable
for line fluid
No valve actuation
Valve failures
Excessively
high valve
operation
torque*
・Stem galling
・Replacing stems, or
valves
・New materials suitable
for line fluid
