ASAHI AV VALVES Installation, Operation and Maintenance Manual
Butterfly Valve Type 57, 56, 56D Electric Actuated Type S 25
Problem Cause Treatment
The valve does not operate by
The supply voltage is wrong. Check voltage with a tester and set
The voltage is low.
Foreign matter is in the valve. Disassemble the valve to remove
foreign matter. (Refer to page 11)
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 6)
Fluid leaks from the valve
even when the valve is closed
The seat is worn. Replace the seat with a new one.
(Refer to page 19)
The seat and disc are scratched.
Replace the scratched seat and disc
with new ones.
(Refer to page 19)
Foreign matter is in the valve.
Discharge the foreign matter from the
valve by opening and closing the
valve several times.
Adjustment of limit switch is wrong. Adjustment limit switch.
The voltage is low. Check voltage with a tester and set
Fluid leaks from the valve.
The seat or the O-ring is scratched or worm.
Replace the seat or the O-ring with a
new one. (Refer to page 19)
The O-ring is projected from the groove.
The sliding face or the fixed face of the O-ring
is scratched or worm.
The actuator operates, but the
valve does not open or shut.
The stem or the joint is broken. Replace the stem or the joint with a
The engagement between the stem and the
disc is broken.
Replace the engagement with a new
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 cam correctly.
(15) 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.)