Q345F Three four close ball valve worm gear in oil, natural gas, coal and ore extraction, refining, processing and pipeline transportation systems; in chemical products, pharmaceutical and food production species; in hydropower, thermal power and nuclear power production systems ; in urban and industrial water supply and drainage, heating, and gas supply system; in the fields of irrigation and drainage systems; in metallurgical production systems to a wide range of applications, is a kind of with the production, construction, national defense and people's lives, important mechanical products. Valve closed piping system in various kinds of media used to cut off or connected to streams,
To media in accordance with a predetermined program transmitted to the various designated points.