Working Principle and Options: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a consistent pace 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 specified relative positions. They are near to one another and also to the housing with out actual contacting, so lubrication is pointless while in the functioning housing. The very carefully balanced working parts and high precision bevel wheels ensue the pump be operated stably and constantly below the problem of high-pressure variation. Dynamic seal element utilizes our patent technological innovation and imported oil seals, the vibration level of shaft within the shaft seals is managed to less than 0.02mm. A gravity valve is installed amongst the suction and exhaust a part of the pump. The function on the gravity valve is as follows, once the stress difference among the suction and exhaust aspect is more than the bodyweight in the valve, the valve opens instantly, which helps make the strain big difference normally continue to keep in the fixed controllable value, the value could be the allowable highest strain variation to ensure the pump operate typically and to ensure in fact, the roots vacuum pump with overflow valve can be a variety of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has substantially greater speed at somewhat reduced inlet stress and it truly is possessed overload self-protective perform. Since it can be a pump of dry clearance seal development, if a specific pumping pace price 15 and an greatest vacuum must be obtained, it truly is required to provide a reduced inlet pressure for reducing the back movement, for that reason, a pump needs to be backed in use, roots vacuum pump really should be commenced quickly after its inlet strain reaches a permissible worth for economization. It really is permit to pick different sorts of pump since the backing pump for factual specifications, this kind of as oil seal pump and liquid ring vacuum pump. When pumping the gasoline containing substantial volume of vapor, the liquid ring vacuum pump could be the excellent backing pump.