... a temperature, pressure, wear, "one drainage," "life-long self-absorption" and many other features. At present production of stainless ... device", and to eradicate the traditional pump packing seal, packing seals, mechanical seal defects, the total elimination of the "running, ... air control valve", truly a "one-draining, life-long self-priming." 4, little vibration, low noise, mobile and flexible ...