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 mounted 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.

In order to reduce the operating torque of the ball valve and increase the reliability of the seal, oil-sealed ball valves have appeared in recent years. The special lubricating oil is injected between the sealing surfaces to form a layer of oil film, which enhances the seal and reduces the operating torque. , More suitable for high pressure large diameter ball valve.