Answer / vaibhav v t

Leakage class does not depend upon any process parameter.It
depends upon user/process requirement.required Shut-off
condition is the parameter and selected trim type and MOC
are parameter upon which leakage class depends.
For detail refer hand book on Control valve by fisher.It is
available on internet.

Answer / narayan sharma

It mainly depends on the fluid property passing through the
control valve i.e temp, viscosity etc.

Eg for Steam application we have to select ClassIV leakage
class,ClassVI can't be used for the same, as Class VI
leakage class can be achieved by using Metal to Soft
sealing & soft sealing can't withstand this high
temperature.

hope this will resolve ur query.

Best of luck.

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