Distinguish between floating ball valve and fixed ball valve

Floating ball is floating, fixed ball valve is fixed, it is like this, generally the small caliber USES floating ball, the big caliber fixed ball, so the model should be Q47 instead of Q41F

The structure of the two ball valves is different. There is also a fixed axis under the ball fixing the ball valve. In the process of valve switching, the ball moves around the upper and lower axis, while the floating ball valve has no lower axis. Generally, floating ball valves are used below 200 caliber, and fixed ball valves are used above 200 caliber.

Floating ball valve

The ball valve ball 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 that the outlet end is sealed.

Floating ball valve has simple structure and good sealing performance, but the ball bears the load of working medium and all the load of working medium is transmitted to the outlet seal ring. Therefore, it is necessary to consider whether the sealing ring material can withstand the working load of spherical medium. This structure is widely used in low and middle pressure ball valves.

Fix the ball valve

The ball valve ball is fixed and does not move under pressure. Fixed ball valves are equipped with floating seats. Under the pressure of the medium, the seat moves and the sealing ring is pressed tightly against the ball to ensure the sealing. Bearings are usually mounted on the upper and lower shafts of the ball with small operating torque for high pressure and large bore valves.

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