Operating Principle and Attributes: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a consistent speed 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 particular relative positions. These are near to one another and also to the housing devoid of actual contacting, so lubrication is pointless within the doing work housing. The very carefully balanced working parts and higher precision bevel wheels ensue the pump be operated stably and continuously below the condition of high-pressure difference. Dynamic seal portion utilizes our patent technologies and imported oil seals, the vibration quantity of shaft about the shaft seals is managed to less than 0.02mm. A gravity valve is set up concerning the suction and exhaust part of the pump. The perform from the gravity valve is as follows, when the stress variation concerning the suction and exhaust part is more than the weight with the valve, the valve opens automatically, which tends to make the strain difference always continue to keep within a fixed controllable worth, the worth could be the allowable highest strain distinction to make sure the pump perform normally and to ensure that actually, 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 considerably larger speed at comparatively lower inlet strain and it truly is possessed overload self-protective perform. As it can be a pump of dry clearance seal building, if a specific pumping speed charge 15 and an greatest vacuum must be obtained, it’s needed to supply a lower inlet strain for decreasing the back movement, as a result, a pump have to be backed in use, roots vacuum pump should be commenced quickly soon after its inlet strain reaches a permissible worth for economization. It really is allow to select different kinds of pump as the backing pump for factual demands, this kind of as oil seal pump and liquid ring vacuum pump. When pumping the gas containing large amount of vapor, the liquid ring vacuum pump would be the excellent backing pump.