Specifications: 1) Construction features: os+y, rising stem, plug type disc, bolted bonnet, or threaded seat ring 2) Standard compliance: a) Basic design: BS 1873 b) Face to face dimension: ANSI B16.10 c) End to end dimension: ANSI B16.10 d) Flanged ends to ANSI B16.5 e) B.W. ends to ANSI B16.25 f) Shell wall thickness: 2 - 12" to API 600 3) Manufacturing to NACE MR 01-75 on request