Suitable for applications that suction inlet is at high vacuum, the distance of suction can reach to 9.5m, especially suitable for applications that suction pipe is extremely long or that operations under high vacuum suction conditions. Suitable for various viscosity or corrosive media. Features 1. Pump must have a low NPSH, about 0.5m~1.5m 2. Adapt with retarding device, the rotate speed as 130~380rmp; 3. The pump have a high limiting vacuum, and still can reach 95% the speed of 130~380rmp. 4. High self-priming capacity ,the distance of suction can reach up to 9 m or above 5. Low vibration and noise