Double nozzle valve is not suitable for long-term use. The check function of double nozzle valve is realized by the spring between two valve plates. Once the spring is fatigued and broken, it will lose its check function. In order to ensure the safety of gas consumption, users are advised to use gas equipment that meets the requirements according to the specifications. Users should pay attention to check and replace the spring regularly when using the double nozzle valve to ensure the normal operation of the check function.