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Operating Principle and Attributes: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a constant pace inside the pump housing for suction and exhaust of fuel. Two rotors are supported by two bearings and synchronized by a gear, which guarantees these two rotors in selected relative positions. They are really close to to one another and to the housing without having real contacting, so lubrication is needless during the operating housing. The carefully balanced working elements and large precision bevel wheels ensue the pump be operated stably and constantly under the situation of high-pressure difference. Dynamic seal portion makes use of our patent engineering and imported oil seals, the vibration level of shaft about the shaft seals is controlled to less than 0.02mm. A gravity valve is installed concerning the suction and exhaust part of the pump. The function in the gravity valve is as follows, once the stress distinction concerning the suction and exhaust element is over the bodyweight on the valve, the valve opens immediately, which can make the stress distinction generally continue to keep within a fixed controllable worth, the value is the allowable highest stress difference to make sure the pump operate usually and in order that actually, the roots vacuum pump with overflow valve is actually a form of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has considerably larger pace at somewhat reduced inlet pressure and it truly is possessed overload self-protective function. Because it is a pump of dry clearance seal building, if a particular pumping velocity rate 15 and an ultimate vacuum have to be obtained, it truly is required to provide a reduce inlet stress for reducing the back flow, consequently, a pump must be backed in use, roots vacuum pump really should be begun quickly just after its inlet strain reaches a permissible worth for economization. It truly is allow to select distinct sorts of pump since the backing pump for factual prerequisites, this kind of as oil seal pump and liquid ring vacuum pump. When pumping the fuel containing big level of vapor, the liquid ring vacuum pump may be the ideal backing pump.