WZW series pump's self-priming ability is outstanding. It need not install bottom valve. It can discharge dirt which solid soft particles is sixty percent of pump's port and fiber length can be five times as long as pump's port. This pump widely applies to delivering polluted water, fiber, solid particles, slag, and paper pulp and so on. The pump is designed with store water room, horizontal bearing box. There are two kinds of axle-seals, mechanical seal and skeleton seal. There is an affusion entrance at the top of pump in order to operate conveniently. The capacity is from 54 cub meter per hour to 300 cub meter per hour, the head from 13m to 22m.