The "Sunshine" safety valve with manual handle is an automatic safety valve designed to open when the internal pressure of the system reaches a specified maximum pressure (Preset Nominal Pressure Pnr), allowing water to flow through it. The safety valve automatically resets when the internal pressure of the system is below the specified maximum pressure. All moving parts of this safety valve, including the regulating spring, are isolated from the heating fluids by an industrial rubber diaphragm. The "Sunshine" safety valve with manual handle meets the essential safety requirements defined in the EU PED 97/23/EC directive.