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
