Working Principle and Features: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a continual speed within the pump housing for suction and exhaust of gas. Two rotors are supported by two bearings and synchronized by a gear, which assures these two rotors in selected relative positions. They’re near to one another and also to the housing with no real contacting, so lubrication is pointless from the operating housing. The cautiously balanced operating parts and large precision bevel wheels ensue the pump be operated stably and continuously beneath the issue of high-pressure big difference. Dynamic seal element uses our patent engineering and imported oil seals, the vibration amount of shaft over the shaft seals is managed to much less than 0.02mm. A gravity valve is put in involving the suction and exhaust a part of the pump. The perform of the gravity valve is as follows, once the strain distinction in between the suction and exhaust portion is over the excess weight on the valve, the valve opens automatically, which helps make the stress distinction normally retain within a fixed controllable worth, the worth is definitely the allowable highest pressure big difference to ensure the pump function usually and to ensure that the truth is, the roots vacuum pump with overflow valve is often a type of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has substantially greater pace at reasonably lower inlet stress and it can be possessed overload self-protective function. Since it is actually a pump of dry clearance seal construction, if a specific pumping velocity fee 15 and an greatest vacuum need to be obtained, it can be needed to provide a reduce inlet stress for lowering the back movement, hence, a pump must be backed in use, roots vacuum pump need to be began quickly right after its inlet pressure reaches a permissible worth for economization. It is actually permit to pick distinctive kinds of pump because the backing pump for factual necessities, such as oil seal pump and liquid ring vacuum pump. When pumping the fuel containing massive amount of vapor, the liquid ring vacuum pump may be the best backing pump.