Introduction: LXL series two-phase flow pumps are a kind of new trash pump and adopt the newest solid-liquid two-phase flow theory. LXL series two-phase flow pumps include K series mash pump , Z series pulp pump and N series slurry pump. The advantages of the pumps are high in efficiency of water power, advanced in structure, excellent in general interchangeability, reliable in operation, strong in adaptability, convenient in maintain, long in service time, and so on. They can be widely used to transport solid grain mediums by water power in metallurgy, mine, coal, power, food, paper making, building material, transportation, irrigation works, sewage discharging and so on.