Why it is standardize that valve above 2" shall be of casting, is there any technical reason or it is not economical to produce the forged valve above 2".
In one of our project, we require 2" Ball valve with A 352 LCB as specified by the client. But vendor is proposing the A 350 LF2 saying that forge is better than cast. Is it true for this case. Valve will be used for Propane liquid.