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Operating Principle and Features: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a continual velocity within the pump housing for suction and exhaust of gasoline. Two rotors are supported by two bearings and synchronized by a gear, which guarantees these two rotors in selected relative positions. They may be close to to one another and also to the housing without real contacting, so lubrication is unnecessary inside the operating housing. The meticulously balanced operating elements and higher precision bevel wheels ensue the pump be operated stably and constantly beneath the issue of high-pressure variation. Dynamic seal component utilizes our patent engineering and imported oil seals, the vibration level of shaft over the shaft seals is controlled to less than 0.02mm. A gravity valve is put in involving the suction and exhaust part of the pump. The perform of your gravity valve is as follows, when the strain distinction among the suction and exhaust element is more than the excess weight from the valve, the valve opens automatically, which tends to make the strain distinction usually hold inside a fixed controllable value, the value could be the allowable highest pressure variation to guarantee the pump operate usually and in order that the truth is, the roots vacuum pump with overflow valve is actually a variety of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has considerably greater pace at fairly lower inlet strain and it is actually possessed overload self-protective function. As it is a pump of dry clearance seal development, if a certain pumping pace charge 15 and an ultimate vacuum have to be obtained, it’s needed to provide a lower inlet strain for cutting down the back flow, hence, a pump should be backed in use, roots vacuum pump must be commenced quickly just after its inlet pressure reaches a permissible worth for economization. It’s allow to select unique varieties of pump as the backing pump for factual needs, such as oil seal pump and liquid ring vacuum pump. When pumping the fuel containing substantial level of vapor, the liquid ring vacuum pump could be the great backing pump.