Structure: Bolted Bonnet, Outside Screw& York, Rising Stem Flexible or Soled Wedge, Welded or Threaded Seat Ring RTJ, RF Flange or Butt Welded Ends , Hand Wheel or Gear Operator Design: API 600, API 6D, ANSI B16.34, BS 1414. JIS B2073 B2083, DIN Material: Steel Class& Size: Class 150~ ~ Class 900, 2" ~ ~ 42"