Natural gas flat gate valve adopts new floating seal structure, suitable for natural gas pipeline with high content of H2S gas, for the opening and closing of the control medium and regulating device, natural gas flat gate valve has novel structural design, proper material selection, strict testing, easy to operate, and strong anti-corrosion, wear-resistant, erosion-resistant performance, suitable for natural gas, petroleum, chemical industry, environmental protection, urban pipelines, gas pipelines and other transmission pipelines, venting systems and steam storage devices, used as opening and closing equipment. It is suitable for natural gas, petroleum, chemical, environmental protection, city pipeline, gas pipeline and other pipelines, venting system and vapor storage device, used as opening and closing equipment.