Ball valve structure

The sealing performance is good, but all the load of the working medium on the ball is transferred 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. The ball may deflect when it is impacted by higher pressure. . This structure is generally used for medium and low pressure ball valves.
The ball of the ball valve is fixed and does not move when pressed. Fixed ball and ball valves all have floating valve seats. After being subjected to medium pressure, the valve seat moves, causing the sealing ring to press tightly on the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the ball, with small operating torque, and are suitable for high-pressure and large-diameter valves.
In order to reduce the operating torque of the ball valve and increase the reliability of the seal, oil-sealed ball valves have emerged. Special lubricating oil is injected between the sealing surfaces to form an oil film, which not only enhances the sealing, but also reduces the operating torque, and more Suitable for high pressure and large diameter ball valves.