The Unique Structure Of Ball Valves

The sealing performance is good, but the ball bears all the load of the working medium and is transmitted to the outlet sealing ring. Therefore, it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. When subjected to high pressure impact, the ball may deviate. This structure is generally used for medium and low pressure ball valves.

The ball of a ball valve is fixed and does not move under pressure. Fixed ball valves are equipped with floating valve seats. When subjected to medium pressure, the valve seat moves, causing the sealing ring to tightly press against the ball to ensure sealing. Usually, bearings are installed on the upper and lower shafts of the ball, with small operating torque, suitable for high-pressure and large-diameter valves.

In order to reduce the operating torque of ball valves and increase the reliability of sealing, oil sealed ball valves have also emerged. Special lubricating oil is injected between the sealing surfaces to form a layer of oil film, which enhances sealing performance and reduces operating torque, making them more suitable for high-pressure large-diameter ball valves.