The Caleffi safety valve is designed for use in boilers, providing excellent protection for central heating systems against overpressure. When the pressure exceeds a preset value, the valve automatically opens, relieving the system and preventing serious risks to people and materials.

This two-port valve has two openings, one for incoming flow and one for outgoing flow. When the inlet is closed, the flow is interrupted, whereas when it is open, the flow at the inlet matches that at the outlet, ensuring the proper operation of the system.