Special ClassSpecial class ratings using the tables from ASME B16.34 can beapplied to any forged steel valve.• Application: Socket Weld, Butt Weld, and Threaded End valves- NPS 1/2 to 4"• NDE Requirements Body and Bonnet:- Volumetric Exam: Radiographic or Ultrasonic Testing- Surface Exam: Liquid Penetrant or Magnetic Particle• Valve Marking: B16.34 SPL