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Flow Under and Flow Over Control Valve
Flow direction for flow under and flow over control valve

What actually mean by Flow under and Flow over control valve? Is there any typical application of this or i can use any type?

That is defined by the valve manufacturer and the valve design.

>What actually mean by Flow under and Flow over control
>valve? Is there any typical application of this or i can use
>any type?

This might help:

Fisher Control Valve Handbook
http://www.documentation.emersonprocess.com/groups/public/documents/book/cvh99.pdf

They might be referring to flow up or flow down through the valve body and trim.