The Renner VS12NT1 safety valve is suitable for use on boilers, providing effective protection against excessive operating pressure. It is designed to ensure the safety of a central heating system by opening when the pressure exceeds a predetermined value, thus allowing the system to decompress. Proper installation at the highest point of the setup is critical, as increased pressure can cause serious hazards.

This specific valve is two-way, featuring two ports: one for inlet and one for outlet of the medium. This means that when the inlet port is closed, the flow is interrupted, while when it is open, the flow at the outlet equals that of the inlet. This functionality increases the efficiency and safety of the installation.