Installation, Operation and Maintenance Manual
Butterfly Valves Type 75, 75D Electric Actuated Type S 18
(14) Troubleshooting
Problem Cause Treatment
The handle is not (can’t be)
turned when the valve is
operated manually.
The valve has already been opened fully. Turn handle in the reverse direction.
(Refer to page 12)
The valve is kept as it is electrified in the
direction reverse to the handle operating
direction.
Turn of the power source.
Foreign matter is in the valve. Disassemble the valve to remove
foreign matter. (Refer to page 8)
The torque of the valve is increased by the
piping stress. Remove the piping stress.
The valve does not operate by
motor-driven operations
The power source of the control panel is
turned off. Turn on the power source.
The torque of the valve is increased by the
piping stress. Remove the piping stress.
The torque is increased by the influence
(temperature, components, pressure) of fluid
on the valve.
Check service condition.
(Refer to page 5)
The actuator is disconnected. Check the connection again.
(Refer to page 7)
Open and close are electrified
simultaneously
Fluid leaks from the valve
even when the valve is closed
fully.
The seat is worn. Replace the seat with a new one.
(Refer to page 14)
Fluid leaks from the valve.
The disc, seat or ball is scratched. Replace the scratched disc, seat or ball.
(Refer to page 14)
Foreign matter is in the valve.
Discharge the foreign matter from the
valve by opening and closing the
valve several times.
The connection bolts are over tightened or
tightened unevenly. Adjust and retighten.
Adjustment of limit switch is wrong. Adjust limit switch.
The voltage is low. Check the voltage.
The O-ring is scratched or worm. Replace the O-ring with a new one.
The actuator operates, but the
valve does not open or close.
The O-ring is projected from the groove. Replace the sliding face or the fixed
face with a new one.
The sliding face or the fixed face of the O-ring
is scratched or worn.
The stem or the joint is broken. Replace the stem or the joint with a
new one.
An Unusual signal comes out.
Limit switch is broken. Replace the limit switch.
The cam of limit switch and the cam of double
limit switch approach it too much. Adjust the cam correctly.
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