AB-6464
22
Table 3 Inspection items and inspection method
Item
Inspection
cycle
Inspection method
Visual check
6 months
• There is no leakage from the grand and flange.
• Loose bolts.
• There is no damage on the valve and actuator.
Operation status
6 months
• The valve is smoothly opened or closed.
• Check that no abnormal sound or vibration is observed.
Daily inspection
W h e n e v e r
necessary
• Check that there is no leakage of fluid to the outside of the valve.
• Check that no abnormal sound or vibration is observed.
• The valve is smoothly opened or closed.
• Check that there is no hunting observed with the valve.
Table 4 Troubleshooting
Abnormal phenomenon
Where to inspect
Measure
Leakage from the flange
Loose flange bolts
Gasket on the flange. Misaligned pipes
Retighten the flange bolts.
Replace the gasket. Do piping again.
Leakage from the gland
ーーーーー
Contact Azbil Corporation
Leakage from the top lid joint.
Loose bolts
Retighten the bolts.
The valve is not smoothly opened
or closed.
The valve stops halfway.
The valve does not move.
Check that the power line and the input
signal are correctly fed.
Loose terminals
Check that wires are firmly connected,
no disconnected wire.
Check the power supply voltage and
the controller.
Retighten the terminals.
Check the wirings.
Leakage is observed when the
valve is fully closed.
Pointer position when the valve is fully
closed
Fully close the valve.
Abnormal sound or vibration is
observed.
Check that level of pressure at the pri-
mary is adequate. Check the level of
differential pressure.
Adjust the mounting conditions.
The auxiliary switch does not
work.
Check the conditions of the auxiliary
switch cam.
Loose terminals
Check that wires are firmly connected,
no disconnected wire.
Do settings again.
Retighten the terminals.
Check the wirings.
The auxiliary potentiometer does
not work.
Resistance value
Loose terminals
Check that wires are firmly connected,
no disconnected wire.
Check the resistance. (1k
Ω
)
Retighten the terminals.
Check the wirings.
Valve hunting
Level of pressure and differential pres-
sure at the secondary
Stability of control
Adjust the mounting conditions.
Adjust the settings of control parame-
ter such as PI.
Mismatch between the input sig-
nal and the feedback signal in
the voltage/current input specifi-
cations
ーーーーー
If the input specification is voltage or
current, the valve moves from 0 % to
100 % corresponding to the input sig-
nal from 10 % to 90 % in order to fully
close the valve.
Therefore, the input signal and the
feedback signal do not match, but it is
not abnormal.
Disposal
Dispose of this product as industrial waste in accordance with your local regulations.
Do not reuse all or any part of the product.
