Machinery, Mining Machinery, Oil Gas Machinery, Riveting Machinery, Ball valve in the pipeline is mainly used to cutting, distributting and changing the direction of the flow of medium, it only needs to use a rotation of 90 degrees and a very small rotation torque can be closed tightly. Ball valve has been widely used in oil refining, pipeline, chemical, paper, pharmaceutical, water, electricity, municipal, steel; industries. Ball, Mining Machinery ...