the inner diameter of dredge ball joint pipes ranges from 400 mm to 1200 mm. dredge ball joint liners can be produced from steel and hard iron materials. to allow for variations of the tilting angle, the ball turning angle of a dredge ball joint is 15 degrees to 18 degrees, and the discharge pipe variation for a dredge ball joint ranges from 10 mm to 30 mm. the dredge ball joints are made to operate at low, medium and high pressure.