PPS Chinese name is polyphenylene sulfide, is a kind of thermoplastic special engineering plastics with excellent comprehensive properties, its outstanding characteristics are high temperature resistance, corrosion resistance and superior mechanical properties. The pump shell made of PPS engineering plastic developed by drupp is light in weight and high in strength, which can fully meet the drinking water standard; it has excellent hydraulic performance and bright and beautiful surface, which can perfectly replace the traditional cast iron pump shell; combined with the advantages of silent and no leakage of wet rotor structure shield pump, it is especially suitable for the application of domestic sanitary hot water circulation pressurization with high water quality requirements.