Difference between Ball Valve and Butterfly Valve

The structure principle of butterfly valves makes them especially suitable to be made into large diameter ones. The disc of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc rotates around the axis. When it is rotated a quarter turn, the valve is fully open. The butterfly valve has simple structure, low cost and wide adjustable range. Ball valves are usually used for liquids and gases without particles and impurities. These valves are with small fluid pressure loss, good sealing performance and high cost.

In the process of opening and closing, the ball valve operates under the holding force of the valve seats at both ends. Compared with the semi-ball valve, the ball valve has larger opening and closing torque. And the larger the nominal diameter, the more obvious the difference of opening and closing torque. The opening and closing of the butterfly valve is realized by overcoming the deformation of rubber. However, it takes a long time to operate gate valves and globe valves and it is also laborious to do that.

Ball valve and plug valve are of the same type. only the ball valve has a hollow ball to control flow through it. Ball valves are mainly used to cut off, distribute and change the flow direction of the medium in pipelines.