1.copper valve 2.Air-conditioning valve 3.Three-way valve 4.Plumbing valve 5.half mold The machine tool ... of electric and ethyne,liquid gas,make the single forming of products in the mould by using ... irregular parts like round,hexagonal,barrel type,and valve parts etc. With the technology, the requirements ... reduced,and the cost can be reduced;the single foming of products will reduce the working ...