First, use: for liquefied petroleum gas, natural gas, artificial gas such as fuel gas appliance on. Second, the basic structure and principles (Refer to GB12203-90 or CJ30-99 standard) 1, the basic structure: it is a thermocouple sensing element and the control valve element of the protection device composed of two parts
2, the structure diagram:

3, it works:
        a, when the gas appliance flame when heated by the flame thermocouple sensing element generates a current, the solenoid valve core and armature stays energized state, keeping the gas passage normal supply. b, when the gas appliance flame is extinguished, the current generated by the thermocouple lead down the solenoid valve armature core and loose, automatically cut off the gas passageway to prevent gas leakage.

Third, the product design (including a model)