Working Principle and Attributes: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a continuous 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 certain relative positions. They are close to to each other and also to the housing with out actual contacting, so lubrication is pointless within the functioning housing. The carefully balanced working components and high precision bevel wheels ensue the pump be operated stably and continuously beneath the situation of high-pressure distinction. Dynamic seal element makes use of our patent technology and imported oil seals, the vibration quantity of shaft over the shaft seals is managed to much less than 0.02mm. A gravity valve is set up concerning the suction and exhaust part of the pump. The perform in the gravity valve is as follows, once the pressure big difference in between the suction and exhaust component is more than the bodyweight from the valve, the valve opens instantly, which tends to make the stress variation generally continue to keep in a fixed controllable worth, the worth could be the allowable highest strain distinction to make sure the pump get the job done commonly and to ensure that the truth is, the roots vacuum pump with overflow valve is usually a kind of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has considerably larger pace at comparatively reduce inlet stress and it’s possessed overload self-protective function. Since it is often a pump of dry clearance seal construction, if a certain pumping pace price 15 and an ultimate vacuum have to be obtained, it can be essential to provide a decrease inlet stress for decreasing the back movement, for that reason, a pump has to be backed in use, roots vacuum pump must be started off soon right after its inlet pressure reaches a permissible value for economization. It can be allow to select unique kinds of pump since the backing pump for factual requirements, such as oil seal pump and liquid ring vacuum pump. When pumping the fuel containing huge quantity of vapor, the liquid ring vacuum pump will be the great backing pump.