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8.4.3. Valve Offline Test
Step Response Test
• Step response test provides information about the friction of the valve and the actuator.
• It provides dead time (time required for the valve to respond to the given change of set
point), response time for it to reach 63% and 86% of the specified step change.
• It also detects overshoots, if any.
• The result can be compared over the course of time for detailed analysis.
Dynamic Loop Test
• Dynamic loop test provides information on dynamic dead band of the valve assembly.
• The valve will be open or close with the change in the input set point.
Valve Characteristic Test
• Valve characteristic test is a method which identifies various parameters and operating
conditions of the valve assembly.
• It analyses the static and dynamic condition of the valve.
• This data can be compared over the course of time to analyse maintenance or repair
requirements.
Dead-band Test
• Dead band test identifies how accurately the valve can achieve the desired set point.
• This test can give a fair conclusion on stiction and sensitivity of the assembly.
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