It could not only pump the flowing liquid, but also convey some medium which is not easy to flow. It could convey high viscous liquid. (viscosity below 10, 000 centipoise). It has advantages of the other pump, such as self-priming pump, submersible pump, shielding pump, mud pump and impurity pump and so on. The pump has no rotating parts, will not cause environmental pollution and endanger personal safety. Good stability, corrosion resistance, acid and alkali resistance, wear resistance, high temperature resistance, The inlet and outlet installation position can be adjusted according to needs, easy to install, easy to maintain. Without electricity, explosion-proof, can convey flammable fluid. No dynamic seals, and does not need oil lubrication, even dry running without damage to the pump. Lift(head) and flow can be adjusted stepless through adjusting valve opening. (air pressure between 2-8kg/cm2) . It allowed to pass through the maximum particle diameter up to 1.5mm pumping slurry, impurity, and with minimal wear.