gangye-valve
https://www.gangye-valve.com/products/class-300-valve.html
Class 300 valves have a pressure rating of 300 pounds per square inch (psi) or 20.7 bar, allowing them to withstand higher pressures than Class 150 valves. They are commonly used in industries such as oil and gas, petrochemical, power generation, and refining. Class 300 valves come in various types, including gate valve class 300, globe valve class 300 , ball valve class 300, check valves, and class 300 butterfly valve. The material selection depends on factors like the fluid, temperature, and compatibility.