The NVR safety valve is a reliable choice for use in boilers. The purpose of this valve is to protect the central heating system from excessive pressure. When the pressure exceeds a predetermined value, the valve automatically opens and allows the system to decompress, thus preventing serious risks that can cause damage or accidents. It features a diode construction, meaning it has two ports: one for the medium's entry and one for the exit. This operation ensures that the flow remains stable: when the entry is closed, the flow stops, while when it is open, the entry flow exactly matches the exit flow. Installing the valve at the highest point of the system allows its efficient operation without the need for other switches or valves.