A safety valve, in particular for preventing overpressure in plants operating with gaseous and/or vaporous and/or liquid fluids and/or mixtures, comprising:
a valve body with an inlet, SAFETY VALVES an outlet and a fluid passageway communicating therebetween, Safety Valves said valve body including a valve seat arranged in said passageway between said inlet and said outlet;

a spring-loaded valve member guided for axial displacement in said valve body and including a seat valve regulating the fluid flow through said valve seat and a valve piston fixedly secured to said seat valve for regulating the fluid flow through said outlet,Safety valves said valve piston being spaced from said seat valve in flow direction of the fluid such as to define a chamber therebetween, with said valve piston being provided with an annular surface which is acted upon by fluid in said chamber; and

a Laval nozzle provided in said outlet for relieving the fluid.

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