Thermocouple and magnetic valve composegas safety protection devices, thermocouple is a transducercan provide the power, magnetic valve is a controller. When thermocouple tips is heated by fire, cold and heat generate thermoelectric power due to temperature difference, to form closed loop current and make magneticvalve actuation,opening gas path. When the flame is out owing to unexpected reasons, thermocouple rapidly lose potential, magnet valve lose suction under the action of spring, so close gas path, and play a safety protection role.

The Pilot Buner include the injector, thermocouple , electrode, ignition wire, pilot tubing, and bracket. They are used in various natural and LP Heating equipment, ensuring that the main burner’s flame is properly and safely formed and does not go out when the appliance is in use. They are classified as thermoelectric-type safety devices or ion-detection safety devices.

Thermocouple is a critical safety device in gas water heaters, functioning as a flame failure detection component. This heat-sensitive sensor generates a small millivoltage (typically 15-35mV) through the Seebeck effect when exposed to the pilot flame. The electrical current maintains the gas control valve in an open position during normal operation. If the flame extinguishes unexpectedly, the thermocouple rapidly cools, interrupting the current flow and triggering an automatic gas shut-off within 2-3 seconds to prevent hazardous gas accumulation.

Thermocouple in a gas grill serves as a vital safety component designed to monitor the pilot flame and prevent uncontrolled gas leaks. When heated by the grill’s pilot flame, the thermocouple generates a small electrical current (typically 10-30mV) via the Seebeck effect. This current keeps the gas supply valve open during normal operation. If the flame extinguishes (due to wind, grease flare-ups, or fuel interruption), the thermocouple cools rapidly, cutting off the electrical signal and triggering an automatic gas shutoff within seconds to ensure safety.

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