ZW Self-priming pump was inherently designed to allow the pump to re-prime itself typically under lift conditions. It can clear its passages of air if it becomes air bound and resume delivery of the pumpage without requiring outside attention. A self-priming pump will lift fluid from a level below the pump and is capable of evacuating air from the pump suction line without any external auxiliary devices. Widely used in environmental protection, agricultural,light industry, paper making, textile industry, food, chemical engineering, electric power, fiber, slurry, suspension and so on.