Operating Principle and Functions: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a frequent velocity inside the pump housing for suction and exhaust of gasoline. Two rotors are supported by two bearings and synchronized by a gear, which ensures these two rotors in specific relative positions. They can be close to to one another and to the housing with out actual contacting, so lubrication is unnecessary inside the doing work housing. The thoroughly balanced operating components and substantial precision bevel wheels ensue the pump be operated stably and constantly under the situation of high-pressure distinction. Dynamic seal part makes use of our patent technological innovation and imported oil seals, the vibration volume of shaft within the shaft seals is controlled to less than 0.02mm. A gravity valve is set up between the suction and exhaust part of the pump. The function in the gravity valve is as follows, when the stress variation involving the suction and exhaust component is above the fat from the valve, the valve opens instantly, which tends to make the strain difference constantly keep inside a fixed controllable value, the worth will be the allowable highest stress distinction to make certain the pump operate generally and to ensure in fact, the roots vacuum pump with overflow valve is actually a sort of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has considerably increased speed at relatively reduced inlet strain and it really is possessed overload self-protective function. As it is a pump of dry clearance seal development, if a particular pumping speed price 15 and an ultimate vacuum have to be obtained, it is essential to supply a reduced inlet pressure for reducing the back movement, consequently, a pump has to be backed in use, roots vacuum pump ought to be started off soon just after its inlet strain reaches a permissible value for economization. It’s allow to select various types of pump since the backing pump for factual needs, such as oil seal pump and liquid ring vacuum pump. When pumping the gas containing large level of vapor, the liquid ring vacuum pump could be the ideal backing pump.