What is the difference between floating ball valve and Trunnion Ball Valves? The ball of the floating ball valve is floating. Under the action of medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure the sealing of the outlet end.
The floating ball valve has the advantages of small volume, light weight and simple structure. The ball of the floating ball valve has the function of free floating, which can better ensure the sealing; The ball can rotate freely in the valve seat sealing ring with the help of the valve stem. When opening, the ball hole is aligned with the pipe diameter to ensure that the working medium resistance of the pipe is very small. When the valve rod rotates for 1 / 4 turn, the ball hole is perpendicular to the channel of the valve. The ball is tightly pressed on the valve seat sealing ring at the outlet end by the preload and medium pressure applied to the two valve seat sealing rings, so as to ensure the complete sealing of the valve. This kind of ball valve is a one-sided forced seal.
The ball of the Trunnion Ball Valves can only rotate along the shaft under the action of the upper and lower valve shafts. The valve seat clings to the valve ball under the action of the back spring. The connection mode of valve ball and valve shaft includes welding, casting, forging and split type; There are many domestic key pin connections and many imported spline connections. Trunnion Ball Valves are equipped with floating valve seats. After being subjected to medium pressure, the valve seats move to make the sealing ring tightly press on the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the ball, with small operating torque. It is suitable for high-pressure and large-diameter valves. The common driving modes of fixed ball valves are worm gear drive, manual, electric and pneumatic. Most Trunnion Ball Valves are flanged, but there are also fixed ball valves in the form of welding.
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