How to choose a correct valve?

1)Working medium:clean air,polluted water,oil or other. 

2)Temperature of medium:0~180℃ 

3)Working temperature:Normal temperature 

4)Working pressure:0~5.0MPa for optional 

5)Thread size:1/8’’~2’’Flange 

6)Orifice:0.5mm~50mm for optional 

7)Body valve material:Brass,SS304,SS316,Plastic for optional

JRFN-010