Working Principle and Capabilities: 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 gas. Two rotors are supported by two bearings and synchronized by a gear, which guarantees these two rotors in specified relative positions. They may be near to each other and also to the housing without the need of actual contacting, so lubrication is needless during the working housing. The cautiously balanced working elements and high precision bevel wheels ensue the pump be operated stably and constantly under the ailment of high-pressure distinction. Dynamic seal aspect utilizes our patent technologies and imported oil seals, the vibration amount of shaft over the shaft seals is controlled to less than 0.02mm. A gravity valve is put in in between the suction and exhaust part of the pump. The function of the gravity valve is as follows, once the strain distinction among the suction and exhaust portion is more than the bodyweight from the valve, the valve opens instantly, which makes the pressure difference always continue to keep in a fixed controllable value, the worth will be the allowable highest stress big difference to make certain the pump get the job done normally and so that the truth is, 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 substantially increased pace at somewhat reduce inlet stress and it can be possessed overload self-protective perform. As it is actually a pump of dry clearance seal construction, if a certain pumping speed price 15 and an ultimate vacuum should be obtained, it is needed to supply a decrease inlet pressure for decreasing the back flow, consequently, a pump have to be backed in use, roots vacuum pump ought to be started off soon right after its inlet pressure reaches a permissible worth for economization. It really is permit to select unique sorts of pump because the backing pump for factual requirements, this kind of as oil seal pump and liquid ring vacuum pump. When pumping the gasoline containing substantial amount of vapor, the liquid ring vacuum pump will be the suitable backing pump.