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ZW series self-priming sewagepump belongs to self-priming centrifugal pumps. The key advantage is that this kind of pump have stronger self-priming capacity. It do not need bottom valve on the pipe line, but the quantitative lead liquid must be stayed before work.The pumps simplified the system of the pipesand they improved the working condition 1) Stable performance, reliable operation 2) Rapid self-priming, high suction head 3) Back-pull-out construction: convenient for maintenance and troubleshooting. Daily maintenance can be performed rapidly by common head tools, saving time and