china ball check valve manufacturers Materials: 

Body: Cast/ductile iron

Ball: Rubber-coated aluminum

Ball rack: Ductile iron

Sliding ball type

Coated with rubber and dependent on line pressure, ball can slide up and down in the integrated chute in body to open or close valves without any noise and water-hammering and nice sealing capability

Full without any block so the flow rate is much with little resisting force and pressure loss and water-head loss is 50% of swing

Installed vertically or horizontally

Used in cold and hot waters, industries and sewage pipeline and more for sewage submersible pump