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 speed within the pump housing for suction and exhaust of gasoline. Two rotors are supported by two bearings and synchronized by a gear, which ensures these two rotors in certain relative positions. They may be near to one another and to the housing with no actual contacting, so lubrication is unnecessary in the functioning housing. The cautiously balanced working elements and high precision bevel wheels ensue the pump be operated stably and constantly under the ailment of high-pressure variation. Dynamic seal element utilizes our patent technology and imported oil seals, the vibration amount of shaft within the shaft seals is controlled to significantly less than 0.02mm. A gravity valve is installed involving the suction and exhaust a part of the pump. The perform of your gravity valve is as follows, when the stress big difference involving the suction and exhaust aspect is over the weight on the valve, the valve opens instantly, which tends to make the stress difference normally retain inside a fixed controllable worth, the worth may be the allowable highest stress distinction to ensure the pump function ordinarily and so that in fact, the roots vacuum pump with overflow valve is actually a sort of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has considerably greater velocity at relatively lower inlet strain and it really is possessed overload self-protective function. As it is actually a pump of dry clearance seal building, if a specific pumping velocity price 15 and an greatest vacuum have to be obtained, it is required to supply a decrease inlet stress for reducing the back movement, consequently, a pump should be backed in use, roots vacuum pump really should be began quickly right after its inlet strain reaches a permissible worth for economization. It is allow to select distinctive varieties of pump as the backing pump for factual needs, this kind of as oil seal pump and liquid ring vacuum pump. When pumping the gas containing substantial amount of vapor, the liquid ring vacuum pump may be the best backing pump.