gangye-valve
https://www.gangye-valve.com/products/class-900-industrial-valve.html
Construction, materials, and testing for ball valve class 900s are similar to those of Class 800 valves. They are typically made from robust materials such as stainless steel, alloy steel, or other high-performance alloys to ensure strength and corrosion resistance under high-pressure conditions. Class 900 valves also undergo rigorous testing to meet industry standards and ensure their performance and safety.