Threaded brass ball valve and welding ss ball valve have integral type, two-always and ternary form. Casting of valve body casting adopts Taiwan advanced technology, reasonable structure, beautiful appearance. The ball valve seat is elastic sealing structure, reliable sealing, easy opening and closing. Valve stem has backward sealing construction, valve cavity when the abnormal pressure, the valve stem will not be rushed out. Joint of two-always and ternary form has butt welding (BW) and socket weld (SW), and all can provide support platform and locking device with international standard ISO .Can be set up with 90 ° switch positioning mechanism, add lock according to the need to prevent wrong operation, type of drive: manual, electric, pneumatic.