Double Axis Butterfly Valve With Soft Seat Size: DN50-DN1200 Product Description Design standard: JB/T 8527 JIS 10K API 609 Face to face: GB/T12221 JISB2002 ASME16.10 Flanged ends: GB 4216 JISB2212-2214 ASME16.5a Test &inspection: GB/T13927 API598 Applicable scope They are used in the pipelines and vessels for conveying vari-ous corrosive and non-corrosive fluid media in the engineering systems of water supply, generating, petroleum.