Two-way thermal insulation plug valve, manual, flange connection, packing seal straight-through structure, plug sealing surface material is gray cast iron (X43W-10), cast copper (X43T-10), nominal pressure PN10, valve body material is gray cast iron plug valve. It is suitable for opening and closing pipelines of water, steam, oil and other media with working pressure less than 1.0MPa and temperature below 100°C.