ANSI/API 607
Fire Test for Soft-Seated Quarter Turn Valves. The standard covers the requirements for testing and evaluating the performance of straightway, soft-seated quarter-turn valves when the valves are exposed to certain fire conditions defined in this standard. The procedures described in this standard apply to all classes and sizes of such valves that are made of materials listed in ASME B16.34.
API 608 : Metal Ball Valves-Flanged and Butt-Welding Ends
API 608 is the purchase specification for class 150 and class 300 metal ball valves. Valve design and construction criteria are detailed. Important Note- ball valve working pressures should be based on seat material, not valve class.