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Operating Principle and Functions: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a consistent pace inside the pump housing for suction and exhaust of fuel. Two rotors are supported by two bearings and synchronized by a gear, which ensures these two rotors in certain relative positions. They can be near to each other and to the housing without having real contacting, so lubrication is pointless from the functioning housing. The thoroughly balanced working parts and large precision bevel wheels ensue the pump be operated stably and continuously under the ailment of high-pressure difference. Dynamic seal element employs our patent technology and imported oil seals, the vibration volume of shaft on the shaft seals is managed to much less than 0.02mm. A gravity valve is installed between the suction and exhaust a part of the pump. The function from the gravity valve is as follows, when the pressure variation concerning the suction and exhaust aspect is in excess of the weight in the valve, the valve opens immediately, which helps make the pressure big difference constantly continue to keep in the fixed controllable worth, the worth will be the allowable highest stress distinction to ensure the pump get the job done ordinarily and to ensure that in truth, the roots vacuum pump with overflow valve is usually a kind of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has substantially increased speed at reasonably reduced inlet pressure and it’s possessed overload self-protective function. As it is actually a pump of dry clearance seal development, if a particular pumping velocity price 15 and an greatest vacuum should be obtained, it is actually essential to provide a reduce inlet pressure for decreasing the back flow, consequently, a pump has to be backed in use, roots vacuum pump really should be started soon following its inlet stress reaches a permissible worth for economization. It can be permit to select different kinds of pump because the backing pump for factual necessities, such as oil seal pump and liquid ring vacuum pump. When pumping the gas containing large amount of vapor, the liquid ring vacuum pump is definitely the ideal backing pump.