... 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 ... make me quote best competitive price to u. cast steel quick shutting valve for marine use