Pressure relief valve for a pressure regulator and pressure regulator comprising said pressure relief valve

A pressure relief valve for a gas pressure, comprising:

• a deformable and gas-tight, laminar element;
• an outflow channel suited to allow the passage of said gas between one side and an other side of said laminar element and comprising a precisely-sized hole;
• a shutter removably associated with said laminar element through coupling means that define for said shutter a closed position, in which said shutter closes said outflow channel in such a way as to prevent said passage of said gas, and an open position, in which said shutter leaves said outflow channel open, said coupling means comprising a through hole belonging to said laminar element and a shaft slidingly inserted in said through hole, said shutter being operatively connected to said shaft, said outflow channel being distinct from said through hole and belonging to said shaft of said coupling means;
• an elastic element suited to thrust said shutter towards said closed position;
• and sealing means for preventing the passage of said gas between said through hole and said shaft.