Installation, Operation and Maintenance Manual
Butterfly Valve Type 55Type 55IS Pneumatic Actuated Type TA
26
Problem
Cause
Treatment
The valve is not operated by air
operations
Adjustment knob of speed controller is turned
right fully.
Turn the adjuster knob left.
(Refer to page 17)
Foreign matter is in the valve.
Disassemble the valve to remove
foreign matter. (Refer to page 9)
The torque of the valve is increased by the
piping stress.
Disassemble the valve to remove the
piping stress.
(Refer to page 9)
The torque is increased by the influence
(temperature, components, pressure) of fluid on
the valve.
Check service condition.
(Refer to page 5)
Fluid leaks from the valve
even when the valve is closed
fully.
The seat is worn.
Replace the valve with a new one.
(Refer to page 22)
The seat and disc are scratched.
Replace the valve with a new one.
(Refer to page 22)
Foreign matter is in the valve.
Discharge the foreign matter from the
valve by opening and closing the valve
several times.
(Refer to page 17)
The connecting bolts are not tightened in proper
torque or evenly.
Adjust and retighten.
(Refer to page 9)
Fluid leaks from the valve.
The O ring is scratched or worm.
Replace the valve with a new one.
(Refer to page 22)
The O ring is projected from the groove.
The sliding face or the fixed face of the
O ring is scratched or worm.
Replace the valve with a new one.
(Refer to page 22)
The actuator operates, but the
valve is not
opened or close.
The stem or the joint is broken.
Replace the valve with a new one.
(Refer to page 22)
The engagement between the stem and
the ball is broken.
Replace the valve with a new one.
(Refer to page 22)
(21) Handling of residual and waste materials
- Make sure to consult a waste treatment dealer for recommendations on the proper disposal of plastic valves.
(Poisonous gas is generated when the valve is burned improperly.)
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