The Watts 040506 safety valve is ideal for boilers, providing secure protection for the heating system. It is easy to install and operates automatically to prevent excess pressure in the system. When the pressure exceeds the allowable limit, the valve opens, allowing proper depressurization and ensuring safe operation. This type of valve is two-way, meaning it has two ports: one for the medium's inlet and one for the outlet. Its function is simple and effective, stopping the flow when the inlet closes, while maintaining a steady flow when open.