Working Principle and Features: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a constant pace within 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 sure relative positions. They can be near to one another and also to the housing without having real contacting, so lubrication is pointless from the operating housing. The thoroughly balanced working elements and substantial precision bevel wheels ensue the pump be operated stably and constantly under the problem of high-pressure big difference. Dynamic seal aspect employs our patent technology and imported oil seals, the vibration quantity of shaft within the shaft seals is managed to significantly less than 0.02mm. A gravity valve is set up involving the suction and exhaust part of the pump. The function of the gravity valve is as follows, once the stress big difference amongst the suction and exhaust portion is more than the bodyweight on the valve, the valve opens instantly, which tends to make the stress variation constantly hold inside a fixed controllable worth, the worth is the allowable highest pressure big difference to make certain the pump do the job commonly and in order that in truth, the roots vacuum pump with overflow valve is usually a variety of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has considerably greater pace at rather lower inlet stress and it is actually possessed overload self-protective function. As it is really a pump of dry clearance seal building, if a specific pumping velocity charge 15 and an greatest vacuum should be obtained, it can be essential to provide a lower inlet pressure for reducing the back flow, thus, a pump need to be backed in use, roots vacuum pump should be began soon immediately after its inlet stress reaches a permissible value for economization. It’s allow to select distinct types of pump because the backing pump for factual prerequisites, this kind of as oil seal pump and liquid ring vacuum pump. When pumping the fuel containing significant volume of vapor, the liquid ring vacuum pump could be the excellent backing pump.