Pressure relief valves are safety devices what control the system’s pressure by diverting the overpressured water. Installed on the pipe system, allows the liquid to flow through of it, and when the pressure exceed the safe value, the valve will force open, and becomes the “path of least resistance”. Then the fluid will divert through an auxiliary route. When the pressure drops below the safe value, the RV will close.
You can select from the listed products here
1/2″ for 10 bar
3/4″ for 10 bar