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The torque of the ball valve
The magnitude of the friction force in a ball valve depends not only on the working pressure of the medium and the valve's bore size but also on the valve's design, the structure of its sealing and support components, and the properties of the sealing materials. Additionally, within any specific structure, the friction force on the sealing seat is further influenced by the rotation angle of the ball valve.
Torque at normal differential pressure: The maximum value occurs when the ball valve rotates to 30°, and it drops to zero at full opening (90°). In practice, when the ball valve reaches 80°, the differential pressure is typically significantly lower than the maximum value.
The maximum pressure differential occurs when the ball valve is closed and gradually decreases as it opens. Therefore, under constant pressure, the maximum force torque generates rotation to 30°~40°. The operation of the ball valve can be divided into two main stages.
(1) From the ball's startup to the initial opening phase of the ball valve, only the frictional force generated by the preload of the sealing element and the static pressure of the working medium acts on the ball during this stage.
(2) From the initial opening of the valve to the stage where the ball hole fully aligns with the valve passage, the friction generated by the static pressure difference during this phase must also account for the force exerted by the liquid or gas medium.
As the valve closes, the ball will block the orifice, reducing the fluid dynamic force on the ball while increasing the differential pressure.
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