Installation, Operation and Maintenance Manual
󲷇H-A071-E-3󲷈Compact Ball Valve Type27 Pneumatic Actuated Type AR 13-50mm (”-2”) 23
19. Troubleshooting
Problem Cause Treatment
The spanner does not
turn (or cannot rotate)
during manual
operation at double
acting type.
Already fully open or fully shut. Turn the spanner in the opposite
direction.
Air is supplied to the actuator. Close the master valve for operation
air, and open the bypass valve.
Foreign matter is in the valve. Replace the valve with a new one.
Valve torque is increasing due to
piping stress. Remove the piping stress.
The torque is increased by the
influence (temperature, components,
pressure) of fluid on the valve.
Check the service condition.
(Refer to pages 5)
The valve does not
operate by air
operations.
The power source of the control
panel is Turned off. Turn on the power source.
The solenoid valve is disconnected. Check the connection again.
(Refer to page 7 and 15)
Air is not supplied to the solenoid
valve. Supply air to solenoid valve.
The supply voltage to the solenoid
valve is wrong. Check voltage with a tester and set
specified voltage.
The voltage to the solenoid valve is
low.
The bypass valve opens.
Close bypass valve by turning the
bypass valve knob in a clockwise
direction.
The speed controller’s knob is fully
turned in a clockwise direction.
Turn speed controller’s knob in a
counterclockwise direction.
(Refer to pages 18)
Foreign matter is in the valve. Replace the valve with a new one.
Valve torque is increasing due to
piping stress. Remove the piping stress.
The torque is increased by the
influence (temperature, components,
pressure) of fluid on the valve.
Check the service condition.
(Refer to pages 5)
Fluid leaks from the
valve even when the
valve is closed fully.
The seat is worn.
Replace the valve with a new one.
The seat and ball are scratched.
Foreign matter is in the valve.
Discharge the foreign matter from the
valve by opening and closing the valve
several times.
Fluid leaks from the
valve.
The O-ring is scratched or worn.
Replace the valve with a new one.
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 close.
The stem or the shaft adapter is
broken. Replace the valve or shaft adapter with
a new one.
The engagement between the stem
and the ball is broken.
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