is it normal for sizing the orifice of a steam valve same size as the connecting pipe?

Question

this steam valve is used to control the flowrate of steam inject into the system. It's a steam positional valve.

Answer 1

It may in fact be smaller than the pipe in which it is installed.

The sizing is based on the flow coefficient of the valve, the allowable pressure drop and the flow rate.

It quite common for the steam control valve to be one or two sizes smaller than the pipe in which it is installed. This is true for many control valves (either automatic or manual)

Answer 2

yes