Pressure regulator

A pressure regulator for a gas comprising:

• an outflow pipe for the gas;
• a movable closure member for opening and closing the outflow pipe in a passage section thereof;
• a main body comprising:
• a first chamber in fluid communication with the outflow pipe,
• a second chamber in atmospheric contact,
• a separation element,
• the first chamber and second chamber being defined in the main body and being separated by the separation element, the separation element being movable inside the main body so as to define a movable separation wall between the first chamber and the second chamber and being fixedly joined to the movable closure member,
• characterized in that the main body further comprises:
• a first magnetic element which is arranged in the first chamber,
• a second magnetic element which is arranged in the second chamber, and
• a third magnetic element which is associated with the separation element,
• the third magnetic element having such a polarity as to be in a state of attraction with one of the first magnetic element and the second magnetic element and in a state of repulsion with the other of the first magnetic element and the second magnetic element.