Classification Of Ball Valves And Introduction Of American Standard Ball Valves
Ball Valve and flange gate valve are valves of the same type, the difference is that its closing piece is a ball, and the ball rotates around the center line of the valve body to achieve opening and closing. Ball valves are mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. Two-piece ball valve and three-piece ball valve are a new type of valve that is widely used. This type of valve should generally be installed horizontally in the pipeline.
Ball valves can be divided into: 1. Floating ball ball valve The ball of the ball valve is floating. Under the pressure of the medium, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure the sealing of the outlet end.
The floating ball ball valve has a simple structure and good sealing performance, but the load of the working medium on the ball is all transmitted to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. This structure is widely used in medium and low pressure ball valves.
2. Fixed ball ball valve The ball is fixed and does not move after being pressurized. Fixed ball valves are equipped with floating valve seats. When subjected to medium pressure, the valve seats move, causing the sealing ring to press tightly against the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the ball. The operating torque is small and it is suitable for high-pressure and large-diameter valves.
3. The ball of the elastic ball valve is elastic. Both the ball and the valve seat sealing ring are made of metal materials. The sealing pressure ratio is very large. The pressure of the medium itself cannot meet the sealing requirements, and external force must be applied. This valve is suitable for high-temperature and high-pressure medium balls.
