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FOB,(,) (.).structural charatcterstics: 1.valve seat can be designed into four-side seated float ball and fixed ball,with smooth fluid state and reliable seal; 2.the structure may be designed into side installed type and top in stalled type,with two way seal,no series flow upon switch over of flow direction; 3.Anti-flyout design of valve stem 4.Antistatic design 5 Two position (on and off) lockup design.