According to sealing structure, ball valve can be classified into floating ball valve and trunnion ball valve. Floating ball valve mainly utilizes the fluid pressure to press the ball on the seat, forming floating seal. For that, the pressure and size are limited. The ball of the trunnion type is fixed and sustained by upper bearing and lower bearing which are installed on valve body. Sealing is realized when spring and fluid pressure push the valve seat to the ball. So the torque of trunnion ball valve is smaller than floating ball valve and can be applies to high pressure and large size. Common straight through ball valve is widely used to cut off fluid. It should not be used to control flow which may cause seal ring erosion. Three way ball valve and four way ball valve are utilize to change the direction of the fluid. Xinhai Ball Valves, API 608, API 6D, BS 5351, forged, cast steel, floating, trunnion, metal to metal seat, side entry, top entry, full welded. 1/2 - 48 inch.
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