quick shutting valve,GB/T5744-93,cast steel material, PN---0.25Mpa DN--- ... steel,ductile iron,stainless steel,SS316,ANSI316 and so on.Size:20A-150AType: AS,ASS,AQS,AQ,BS,BQ,BSS,BQSCertificate ... quote best competitive price to u. cast steel quick shutting valve for marine use