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Working Principle and Functions: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a continual velocity inside the pump housing for suction and exhaust of gasoline. Two rotors are supported by two bearings and synchronized by a gear, which assures these two rotors in particular relative positions. They are really near to each other and to the housing devoid of real contacting, so lubrication is needless in the doing work housing. The cautiously balanced working parts and high precision bevel wheels ensue the pump be operated stably and continuously below the affliction of high-pressure difference. Dynamic seal part uses our patent technologies and imported oil seals, the vibration volume of shaft to the shaft seals is controlled to less than 0.02mm. A gravity valve is put in between the suction and exhaust part of the pump. The perform in the gravity valve is as follows, once the strain variation concerning the suction and exhaust aspect is above the fat of your valve, the valve opens automatically, which can make the strain difference normally continue to keep in the fixed controllable value, the worth may be the allowable highest stress difference to guarantee the pump function normally and to ensure in fact, the roots vacuum pump with overflow valve is really a form of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has considerably larger velocity at fairly reduce inlet stress and it’s possessed overload self-protective perform. Because it can be a pump of dry clearance seal development, if a certain pumping velocity fee 15 and an greatest vacuum need to be obtained, it is required to supply a reduce inlet stress for lowering the back movement, therefore, a pump must be backed in use, roots vacuum pump needs to be started out quickly after its inlet strain reaches a permissible value for economization. It truly is permit to select unique varieties of pump since the backing pump for factual specifications, such as oil seal pump and liquid ring vacuum pump. When pumping the gas containing big quantity of vapor, the liquid ring vacuum pump is the suitable backing pump.