How we will finilize the 2 way & 3 Way valve in chilled water pipeline? on what basis we will select this valves?

Secondo la potenzialità del scambiatore di calore.

it's depend on the design of the system.

its all depend on the design of the system if its a two pipe system or four pipe system ,with variable flow .

Depend on the design of the system if Constant Flow or Variable Flow