Working Principle and Features: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a frequent pace within the pump housing for suction and exhaust of gas. Two rotors are supported by two bearings and synchronized by a gear, which guarantees these two rotors in sure relative positions. These are close to to one another and to the housing without having actual contacting, so lubrication is pointless in the working housing. The carefully balanced working elements and substantial precision bevel wheels ensue the pump be operated stably and continuously below the problem of high-pressure distinction. Dynamic seal portion uses our patent technological innovation and imported oil seals, the vibration level of shaft around the shaft seals is controlled to significantly less than 0.02mm. A gravity valve is installed in between the suction and exhaust a part of the pump. The perform from the gravity valve is as follows, when the pressure variation among the suction and exhaust aspect is in excess of the excess weight of the valve, the valve opens immediately, which makes the pressure big difference usually preserve inside a fixed controllable worth, the worth is the allowable highest stress variation to be sure the pump get the job done ordinarily and so that the truth is, the roots vacuum pump with overflow valve is usually a variety of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has considerably greater speed at somewhat decrease inlet stress and it is actually possessed overload self-protective perform. Because it is usually a pump of dry clearance seal building, if a specific pumping velocity charge 15 and an greatest vacuum need to be obtained, it really is required to supply a reduce inlet pressure for minimizing the back movement, thus, a pump have to be backed in use, roots vacuum pump should be started out soon just after its inlet stress reaches a permissible worth for economization. It is actually allow to pick distinctive varieties of pump because the backing pump for factual necessities, such as oil seal pump and liquid ring vacuum pump. When pumping the gas containing substantial volume of vapor, the liquid ring vacuum pump will be the great backing pump.