Operating Principle and Capabilities: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a continual 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 specified relative positions. They are really close to to one another and also to the housing with out actual contacting, so lubrication is unnecessary within the functioning housing. The thoroughly balanced operating parts and high precision bevel wheels ensue the pump be operated stably and constantly beneath the condition of high-pressure difference. Dynamic seal portion uses our patent technologies and imported oil seals, the vibration quantity of shaft around the shaft seals is managed to less than 0.02mm. A gravity valve is installed concerning the suction and exhaust part of the pump. The perform on the gravity valve is as follows, once the stress big difference amongst the suction and exhaust aspect is over the weight of your valve, the valve opens immediately, which helps make the stress difference normally continue to keep inside a fixed controllable worth, the worth will be the allowable highest pressure variation to ensure the pump operate generally and so that actually, the roots vacuum pump with overflow valve is actually a kind of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has substantially higher pace at somewhat reduce inlet strain and it is possessed overload self-protective perform. Because it is usually a pump of dry clearance seal building, if a certain pumping speed price 15 and an ultimate vacuum must be obtained, it is actually necessary to supply a reduce inlet stress for cutting down the back movement, as a result, a pump has to be backed in use, roots vacuum pump should be began quickly immediately after its inlet stress reaches a permissible value for economization. It is permit to select different varieties of pump since the backing pump for factual requirements, such as oil seal pump and liquid ring vacuum pump. When pumping the fuel containing significant amount of vapor, the liquid ring vacuum pump is the ideal backing pump.