Reduced Bore Ball Valve

First, do this:Interactive online Google tutorial and references - Google Guide

Then you can find this:

Ball Valve - Basic Ball Valve Designs, 3 way ball valve, stainless ...

Valve Basics and Selection Tips

What is a Ball Valve?

What do you want to ask?????

in my understanding ball can be reduced bore type or full bore type. but in GS-EMEPMI some of valve stated as regular bore type. is it equivalent to reduced bore. please adviced me.

Forget the bore calculate the Cv of both regular and reduced. If both are same then use anyone else, opt for correct size.