The Caleffi safety valve is ideal for protecting your boiler from excessive pressure. This safety device is installed in central heating systems and opens when the pressure exceeds a preset value, preventing serious risks to the operation and safety of the installation. It is important to know that this two-way valve has two ports: one for the inlet of the medium and one for the outlet. When the inlet is closed, the flow is interrupted, while opening the inlet allows the outlet flow to follow the same path.