Application: Throttling Features/ Benefits: OS & Y Construction Welded & Renewable Seat Rings Pressure Seal Welded Bonnet on Request for High Pressure Ansi Class/ Rating: 800#, 1500#, 2500# Design Standard: API 602, ISO 15761, ASME B16.34 Testing Standard: API 598 Materials: A105, F11, F22, LF2, F304, F304L, F316, F51, F53, F55, F347, F321, INCONEL 625, MONEL 400, HASTELLOY C-276, ALLOY 20 etc.