... , sole pump, etc. When the 2 simultaneous reverse rotating rotors (with 2-4 gears) revolve, it produces suction force at the ... medium; when it goes to position chousing A encloses medium, and finally it goes to position d, then housing A, B ... , medium (material) is transpor-ted continuously. Welcome to contact us for more information Centrifugal Pump,High Quality Pump,delivery pump,pump ...