Size: NPS2â-56â Pressure Rating: Class150-2500 LB Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel End: BW, RF, RTJ Operation: Manual, Pneumatic, Electric Design & Manufacture Standard: API600, ASME B16.34 Face to Face: ASME B16.10 End Connection: ASME B16.5, ASME B16.47, ASME B16.25 Test Standard: API598 Bolted bonnet OS&Y Rising stem Threaded or welded seat Flexible wedge (solid wedge for small sizes) Asbestos free Optional stem extension