Ball valve was an important mechanical product which had a close relation with production, national defence and people living. It was applied to many systems. For example the exploitation, abstraction, procession and pipe transportation systems of petroleum, nature gas, coal and ore; chemical products, medicine and food production; electric power systems of water and electricity, firepower electricity and nuclear power; water supply and drainage system, heating and air supply systems of cities and industry corporation; farmland irrigation and drainage system; metallurgy system. It was pressurized in pipe systems to turn-off or turn-on the medium and transport it to the appoint place according to scheduled procedure.
Plywood or wooden packing as export standard.
