quick shutting valve,GB/T5744-93,cast steel material, PN---0.25Mpa DN---20A-150A CAST STEEL GB STANDARD QUICK SHUTTING VALVEMaterial:cast iron ... ,bronze,cast steel,ductile iron,stainless steel,SS316,ANSI316 and so on.Size:20A-150AType: AS ... suggestion,make me quote best competitive price to u. cast steel quick shutting valve for marine use