Installation, Operation and Maintenance Manual
Butterfly Valve Type 55Type 55IS Pneumatic Actuated Type TA
25
(19) Inspection items
- Perform periodic maintenance. (Leakage may develop due to temperature changes or over periods of
prolonged storage, rest or operation.)
Periodically inspect and maintain the AV valve in accordance with the decided schedule.
Portion to be inspected
Inspection item
Actuator
1Existence of rust, peeling of paint, and corrosion around the actuator.
2Tightening condition of respective threaded portions. (Loose or not)
3Existence of abnormality in opening and closing operating sounds.
4Smooth operation of manual handle.
* It is unnecessary to supply oil to this actuator.
Valve
1Existence of scratches, cracks, deformation, and discoloring.
2Existence of leakage from the valve to the outside.
3Existence of leakage when the valve is closed fully.
(20) 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 the handle in the reverse direction.
(Refer to page 17)
The air is supplied to actuator.
Shut the main air valve, and open the
bypass valve.
Foreign matter is in the valve.
Remove the valve to remove foreign
matter. (Refer to page 9)
The torque of the valve is increased by the
piping stress.
Remove the piping stress.
(Refer to page 10)
The torque is increased by the influence
(temperature, components, pressure) of fluid on
the valve.
Check service condition.
(Refer to page 5)
The valve does not operate by
air operations
The power source of the solenoid valve is
turned off.
Turn on the power source.
The solenoid valve is disconnected.
Check the connection again.
(Refer to page 16)
The air is not supplied to actuator.
Supply the air.
The supply voltage to the solenoid valve is
wrong.
Check the voltage with a tester and set
specified voltage.
The voltage to the solenoid valve is low.
The bypass valve is opened.
Turn the knob of the bypass valve right
to close. (Refer to page 17)
Caution
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