Operating Principle and Options: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a consistent 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 sure relative positions. They can be close to to each other and also to the housing with out actual contacting, so lubrication is needless during the working housing. The carefully balanced working elements and higher precision bevel wheels ensue the pump be operated stably and constantly beneath the affliction of high-pressure variation. Dynamic seal part utilizes our patent engineering and imported oil seals, the vibration level of shaft over the shaft seals is managed to much less than 0.02mm. A gravity valve is set up between the suction and exhaust part of the pump. The perform with the gravity valve is as follows, when the pressure difference in between the suction and exhaust component is more than the weight of your valve, the valve opens automatically, which helps make the strain variation always maintain inside a fixed controllable value, the worth is definitely the allowable highest strain distinction to ensure the pump work generally and so that actually, the roots vacuum pump with overflow valve is actually a variety of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has substantially greater speed at somewhat reduce inlet strain and it can be possessed overload self-protective function. As it is really a pump of dry clearance seal development, if a certain pumping pace rate 15 and an ultimate vacuum need to be obtained, it truly is required to provide a reduce inlet strain for minimizing the back movement, thus, a pump must be backed in use, roots vacuum pump needs to be started off quickly immediately after its inlet pressure reaches a permissible value for economization. It can be allow to select unique varieties of pump since the backing pump for factual necessities, such as oil seal pump and liquid ring vacuum pump. When pumping the gasoline containing massive level of vapor, the liquid ring vacuum pump would be the ideal backing pump.