Working Principle and Options:
The series SYF roots vacuum pump is with 
overflow valve. The figure-of-eight rotors are counter-rotating at a consistent velocity inside the pump housing for suction and exhaust of fuel. Two rotors are supported by two bearings and synchronized by a gear, which assures these two rotors in sure relative positions. They’re near to each other and to the housing without having actual contacting, so lubrication is unnecessary inside the doing work housing. The carefully balanced working parts and higher precision bevel wheels ensue the pump be operated stably and constantly underneath the problem of high-pressure distinction. Dynamic seal part use our patent technologies and imported oil seals, the vibration level of shaft to the shaft seals is controlled to less than 0.02mm.
A gravity valve is installed in between the suction and exhaust part of the pump. The function with the gravity valve is as follows, once the pressure big difference concerning the suction and exhaust aspect is over the excess weight from the valve, the valve opens automatically, which helps make the strain variation often keep in a fixed controllable worth, the value will be the allowable highest stress distinction to ensure the pump function commonly and to ensure in reality, 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 larger speed at somewhat lower inlet stress and it is possessed overload self-protective function. Because it can be a pump of dry clearance seal construction, if a particular pumping speed charge and an greatest vacuum must be obtained, it can be necessary to supply a reduced inlet stress for minimizing the back flow, therefore, a pump need to be backed in use, roots vacuum pump really should be started out soon just after its inlet strain reaches a permissible worth for economization.
It really is permit to select various sorts of pump as the backing pump for factual specifications, such as oil seal pump and liquid ring vacuum pump. When pumping the fuel containing big amount of vapor, the liquid ring vacuum pump may be the perfect backing pump.