Modulatable safety valve

A safety valve for controlling a gas flow comprising:

• a double safety valve with a magnetic armature that moves by a voltage applied to a coil;
• a first valve with a first valve body, a first valve spring, and a first valve seat;
• a second valve with a second valve body, a second valve spring and a second valve seat;
• a movement of the armature acts from a closed position of the safety valve at first against a spring force of the first valve spring and loosens the first valve body from the first valve seat;
• the movement of the armature subsequently acts against a spring force of the second valve spring and loosens the second valve body from the second valve seat and therefore frees a valve opening for flowthrough of the gas;
• a spring constant of the second valve spring is greater than a spring constant of the first valve spring, and a flowthrough amount of the gas flow through the valve opening can be continuously controlled as a function of the voltage applied to the coil between a closed position and a fully open position, even in partially open positions;
• and
• the first valve spring has a spring constant designed in such a manner that the movement of the armature takes place after a first critical voltage value and moves the first valve body suddenly and fully from the first valve seat into a fully open positions;
• the second valve spring has a spring constant, designed such that the second valve body only comes loose from the second valve seat after exceeding the first critical voltage level, and an open position of the second valve body can be controlled by the voltage applied to the coil;
• and
• the control of the rate of the gas flow through the valve opening of the safety valve takes place exclusively by lifting the second valve body and as a function of the voltage applied to the coil.