3RP series rotary lobe pump belongs to positive displacement pump and has the advantages of outstanding self-priming, high efficiency and long life. It applies to delivering suspension liquid with soft solid particles, corrosive medium and suspension liquid. The delivered medium temperature range from -30 centigrade to 180 centigrade and viscosity range from 30cSt to 1.0x105cSt. The parts of contact with medium adopt stainless steel. The rotating speed can be adjusted according to the delivered medium's physical property. This series pump used for foodstuff, drink, medicine, daily chemical, petroleum, chemical industry, etc.