OS&Y,Rising Stem,Flexible Solid Wedge Bolted Bonnet,Threaded or Welded Seat Ring STANDARDS COMPLIANCE: Basic Design:API 600 Face to Face Dimension:ABSI B16.10 End to End Dimension:ANSI B16.10 End Flange Dimension: 2"-24" to ANSI B16.5 26"-36" to MSS SP-44 to API 605 on request B.W Ends to ANSI B16.25 Shell wall Thickness: 2"-24"to API 600 26"-36"to Manufacturer's Standard Manufacturing to NACE MR-01-75 on request Rating vary 150 to 1500lbs