Working Principle and Options:
The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a continuous velocity within 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 may be close to to each other and also to the housing with out actual contacting, so lubrication is needless from the operating housing. The meticulously balanced working parts and substantial precision bevel wheels ensue the pump be operated stably and continuously beneath the issue of high-pressure big difference. Dynamic seal portion use our patent technology and imported oil seals, the vibration quantity of shaft within the shaft seals is managed to less than 0.02mm.
A gravity valve is installed amongst the suction and exhaust a part of the pump. The perform in the gravity valve is as follows, once the pressure difference involving the suction and exhaust element is 
above the fat in the valve, the valve opens immediately, which can make the strain distinction generally keep in a fixed controllable worth, the worth is the allowable highest stress difference to be sure the pump work typically and to ensure in reality, the roots vacuum pump with overflow valve can be a sort of overload self-protective pump.
Series SYF roots vacuum pump with overflow valve has considerably larger velocity at somewhat decrease inlet pressure and it is actually possessed overload self-protective function. Since it is often a pump of dry clearance seal development, if a specific pumping speed charge and an ultimate vacuum need to be obtained, it is needed to provide a lower inlet stress for reducing the back movement, for that reason, a pump need to be backed in use, roots vacuum pump must be started off soon soon after its inlet strain reaches a permissible value for economization.
It truly is allow to pick diverse types of pump because the backing pump for factual requirements, this kind of as oil seal pump and liquid ring vacuum pump. When pumping the gas containing large volume of vapor, the liquid ring vacuum pump would be the suitable backing pump.
