The durable GB standard stainless steel gate valve manufactured by JQF Valve is made of stainless steel. The valve seat sealing surface is made of polytetrafluoroethylene (PTFE), stainless steel + hard alloy, or surface-treated hard alloy. The packing is made of hard alloy, polytetrafluoroethylene (PTFE), asbestos, or flexible graphite. The nominal size is DN15~DN800, the working pressure is 1.6MPa~20.0MPa, and the applicable temperature is ≤200℃. It is suitable for pipelines carrying nitric acid and weakly corrosive media.