1).life-long self-absorption 2).ISO9001, ISO140001 WFB series of non-sealing self-control self-priming pump is to fill ... , carbon steel, titanium and other materials a series of machine, five different forms of a thousand kinds of specifications. In the electronics, electric power ... during the sealing device is not friction, no wear, longer service life than similar products in more than 10 times. 3 ...