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Difference between floating ball valve and fixed ball valve

Time: 2016-03-25Source : Shanghai Nuoyou Valve Industry Co., Ltd.

Difference between floating ball valve and fixed ball valve

First, floating ball valve        The ball of the ball valve is floating. Under the action of the medium pressure, the ball can produce a certain displacement and be tightly pressed against the sealing surface at the outlet end to ensure the outlet end is sealed.        The structure of the floating ball valve is simple and the sealing is good, but the load of the ball bearing the working medium is transmitted to the outlet seal ring, so it is necessary to consider whether the material of the ring ring can withstand the working load of the ball medium. This structure is widely used in low and medium pressure ball valves.

 

Second, fixed ball valve

The ball of the ball valve is fixed and does not move after being pressed. Fixed ball valves are equipped with floating valve seats. After the pressure of the medium, the valve seat moves, so that the sealing ring is tightly pressed on the ball to ensure the seal. Bearings are usually installed on the upper and lower shafts of the ball, and the operating torque is small, which is suitable for high pressure and large diameter valves.

The floating ball valve only has the upper section of the valve shaft, that is, the ball has a certain displacement in the valve body. The ball and the valve seat are tightly sealed by the pressure of the medium, and the seal is formed on only one side of the ball valve. The application is more common; That is, the ball is fixed, and the valve seats on both sides are pressed against the ball by a spring on the back to form a seal.

See the figure for details

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