dard, which was widely applied for petroleum, checmical industry, pharmecy,chemical fertilizer, power industry etc, lubricated plug valves can be called as Pressure ballance lubricated plug valves, the main application of it is cutting and connectting the pipeline midium with pressure class 150 to class 900 under the temperature -29℃ to +180℃.Main Characteristics1. There are compact structure, reliable sealing, perfect function and attractive shape for lubricated plug valve natural gas.2. Inve