Specification: 50T,88T,130T made of high quality ductile cast iron with appropriate alloying elements, with denser internal structure, better corrosion resistance and wear resistance. The material liquid channel chooses the high quality stainless steel pipe to bend, the wall thickness is uniform, the strength is good, is not easy to burst. The inner liner material is made of high-abrasion resistant alloy with high purity. After high-pressure gas quenching and surface gas hard nitriding treatment, the wear resistance and fatigue resistance are high.