The complete model of D7 1X- 16 should be D7 1X- 16Z, where z indicates that the butterfly valve body is made of gray cast iron, which can usually be ignored in the model representation, that is, D71x-16;

C in D7 1X- 16C indicates that the valve body of butterfly valve is made of carbon steel;

So the difference between D7 1X- 16 and D7 1X- 16C is that one is gray cast iron and the other is carbon steel.

DN 100 means that the diameter of butterfly valve is 100mm, which means the inner diameter;

A complete butterfly valve model needs parameter information such as caliber, driving mode, connection mode, structural form, sealing surface material, nominal pressure and valve body material. With this information, you can make a quotation.