Structure is important for ball valve
Good sealing, but the ball bear the load of the working medium all passed to the export seal, so to consider if the material can withstand the ball ring material working load of the ball, subject to higher pressure shock, the ball may be offset . This structure, generally used in low-pressure ball valve.
The ball of the ball is fixed, do not move after compression. Fixed ball valve with a floating seat, subject to media pressure, the seat movement, so that the ring pressed on the ball to ensure that the seal. Usually with the ball on the upper and lower shaft with bearings, operating torque is small, 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, but also appeared in the oil seal ball valve, both in the sealing surface pressure injection of special lubricants to form a layer of oil film, which enhanced the sealing, For high-pressure large-diameter ball valve.