WFB self-priming centrifugal pump is widely used in electric power, chemical industry, metallurgy, medicine, food, environmental protection, fire-fighting, municipal, water purification, textile printing and dyeing, mining and mineral processing industries. The pump is characterized by temperature resistance, corrosion resistance, wear resistance and no leakage. The machine adopts leakage-free sealing device, specifically composed of dynamic seal and auxiliary seal, so there is no friction and wear of sealing device during operation, and the service life is several times higher than other products.