Installation, Operation and Maintenance Manual
Butterfly Valve Type 55・Type 55IS Pneumatic Actuated Type TA
(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
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.
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.
The handle is not (can’t be)
turned when the valve is
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
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
Remove the piping stress.
(Refer to page 10)
The torque is increased by the influence
(temperature, components, pressure) of fluid on
Check service condition.
(Refer to page 5)
The valve does not operate by
The power source of the solenoid valve is
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
Check the voltage with a tester and set
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)