Azbil Corporation
Model: AMT, HDT - CV3000 Series Control Valves
54
Symptom Cause and Remedy
Even when valve plug is in closed
position, large flow leaks to
downstream side.
• Air leak at actuator section.
• For trial, apply the air supply pressure or atmospheric pressure to the
actuator. (Check the air supply source and positioner.)
• Check whether the valve plug is actually the closed position or not.
(Check the valve plug lift)
• Check the plug seat ring for corrosion and erosion.
• Check the guide sections for binding.
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