In case of lighting failure, flameout and gas using up etc, the mechanism turns off the gas valve in 0.5s automatically with light and sound alarm, safe and reliable.
在点火不成功、意外熄火。燃气用完等情况下，能在0.5秒内自动关闭气阀，并发出声光警告，安全可靠。
At present the use of the butterfly valves for more than soft sealed off valve, characterized by simple structure, light weight, easy maintenance, construction costs low;
目前使用的蝶阀多为软密封蝶阀，其特点是结构简单、重量轻、维修方便、成本造价低；
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