1).life-long self-absorption 2).ISO9001, ISO140001 WFB series of non-sealing self-control self-priming pump is to fill the gaps ... a temperature, pressure, wear, "one drainage," "life-long self-absorption" and many other features. At present production of stainless ... reinforced polypropylene, carbon steel, titanium and other materials a series of machine, five different forms of a thousand kinds of ...