Working Principle and Capabilities: 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 gasoline. Two rotors are supported by two bearings and synchronized by a gear, which assures these two rotors in selected relative positions. They’re close to to each other and to the housing devoid of real contacting, so lubrication is pointless in the working housing. The carefully balanced operating parts and substantial precision bevel wheels ensue the pump be operated stably and constantly underneath the issue of high-pressure variation. Dynamic seal portion uses our patent technology and imported oil seals, the vibration amount of shaft on the shaft seals is managed to significantly less than 0.02mm. A gravity valve is put in among the suction and exhaust part of the pump. The function in the gravity valve is as follows, when the pressure distinction amongst the suction and exhaust aspect is over the fat with the valve, the valve opens automatically, which helps make the stress difference normally maintain in the fixed controllable worth, the value is definitely the allowable highest pressure difference to make certain the pump perform commonly and so that in truth, the roots vacuum pump with overflow valve can be a sort of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has considerably higher speed at somewhat reduce inlet strain and it is possessed overload self-protective function. Since it can be a pump of dry clearance seal construction, if a particular pumping velocity fee 15 and an greatest vacuum have to be obtained, it really is required to supply a reduced inlet pressure for reducing the back flow, hence, a pump must be backed in use, roots vacuum pump should be started out soon soon after its inlet stress reaches a permissible worth for economization. It is permit to pick distinct sorts of pump since the backing pump for factual needs, such as oil seal pump and liquid ring vacuum pump. When pumping the fuel containing massive quantity of vapor, the liquid ring vacuum pump would be the ideal backing pump.