The Italy product characteristics, and compared with ordinary ball valve, structure of short length, light weight, convenient installation, material saving and other significant advantages. Folder on the insulation jacket ball valve has good heat insulation effect. In addition, the valve seat adopts elastic sealing structure, sealed reliable, open and close easily. A refractory structure, in the event of fire, still capable of reliable operation and has good sealing performance. According to user needs, can be equipped with anti-static structure. Set of 90 °switch with positioning holes, according to need can be locked, preventing misoperation.