3RP sanitary rotary lobe pump belongs to one kind of volumetric pump, designed for conveying sanitary fluid and corrosive high viscosity medium, the temperature range of the conveyed medium is -30~180 ℃, the viscosity range is 30 cst~100000 cst. The internal parts of the pump in contact with the medium are made of corrosion-resistant stainless steel, which not only meets the sanitary standard of the industries of food, beverage, pharmacy, daily-use chemical industry, petroleum and paper making, but also effectively prevents the contamination of the material. It meets the hygienic standard of food, beverage, pharmaceutical, daily chemical, petroleum and paper industries, and can effectively prevent the material from being contaminated.