First, why are you posting anonymously? Everyone's here to help each other out but if the post is anonymous, we have no idea of even which country you live in.
Contact your nearest Dezurik valve representative and ask them for their Alpha-1 valve sizing software. This assumes you live somewhere in the world that Dezurik markets to.
I am working in process industry in operation department for 15 years. I would like to study on control valve sizing for all types. Please give me reference /web site for free study material.