Steam jacket rotary lobe pump and sanitary grade rotary lobe pump are one of the series products developed and manufactured by DURREX. Steam jacket pump by the steam or hot water be injected into the pump body or pump cover to keep the working chamber constant temperature. When the pump starting up, it can prevent the material solidifying lead to the mechanical seal be damaged effectively, this design protects the mechanical seal well. The pumps be widely used material viscosity is greatly affected by temperature, such as chocolate, massecuite, and so on. Sanitary grade rotary lobe pump has sanitary rotor, rotor locking nut O - ring, pump body without sanitary dead angle, and support CIP、SIP on line cleaning. The pump’s surface roughness is 0.2--0.6 mm, and have got 3 A, FDA certification. Sanitary grade rotary lobe pump can be widely used food, medicine and other materials with high requirements for hygiene level.