... corrosive media, such as acid, alkali, and salt and so on.Design and test standardsAWWA C504Connecting flange accord withANSI B16.1 ... used for water system, adjust and closure equipment used to do;2.3 "24 "rubber seat directly vulcanization to the body ... ; 30 "72 "seat with press fixed in body, can achieve on-line maintenance, replacement;3.30 "72 "eccentric structure, equipped with overflow ...