Installation, Operation and Maintenance Manual
Butterfly Valves Type 75, 75D Pneumatic Actuated Type TW 22
Problem Cause Treatment
The valve does not operate by
air operations
Adjustment knob of speed controller is turned
right fully.
Turn the adjuster knob left.
(Refer to page 18)
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.
Disassemble the valve to remove the
piping stress. (Refer to page 8)
The torque is increased by the influence
(temperature, components, pressure) of fluid on
the valve.
Check service condition.
(Refer to page 6)
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 19)
The seat and ball are scratched. Replace the scratched seat and ball
with new ones.
Foreign matter is in the valve.
Discharge the foreign matter from the
valve by opening and closing the
valve several times.
(Refer to page 16)
The connecting bolts are not tightened in
proper torque or evenly.
Adjust and retighten.
(Refer to page 8)
Fluid leaks from the valve.
The O-ring is scratched or worm. Replace the O-ring with a new one.
(Refer to page19)
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 sliding face or the fixed
face with a new one.
(Refer to page 19)
The actuator operates, but the
valve is not open or close.
The stem or the joint is broken. Replace the stem or the joint with a
new one. (Refer to page 19)
The engagement between the stem and the ball
is broken.
Replace the engagement with a new
one. (Refer to page 19)
(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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