what are the factors should be know to select a control valve for specified application
There are numerous articles online that address this question from choosing the correct size to the correct actuator. Here are just a few:
control valve is an uni-directional (non-return) valve, some of the factors to be aware of before selecting it....identify application character, select the valve size, select the valve end connection, piping layout and valve orientation , maintenance requirement , actuation requirement , initial cost ..etc..