Operating Principle and Features:
The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a constant speed within 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 specific relative positions. These are close to to each other and to the housing without real contacting, so lubrication is pointless from the functioning housing. The cautiously balanced working elements and higher 
precision bevel wheels ensue the pump be operated stably and constantly underneath the situation of high-pressure difference. Dynamic seal aspect use our patent technology and imported oil seals, the vibration level of shaft about the shaft seals is controlled to less than 0.02mm.
A gravity valve is set up between the suction and exhaust part of the pump. The function on the gravity valve is as follows, once the stress variation between the suction and exhaust aspect is more than the weight in the valve, the valve opens automatically, which tends to make the stress distinction constantly continue to keep in a fixed controllable value, the value would be the allowable highest pressure variation to make certain the pump operate normally and to ensure that the truth is, the roots vacuum pump with overflow valve is often a sort of overload self-protective pump.
Series SYF roots vacuum pump with overflow valve has substantially higher speed at relatively lower inlet strain and it is possessed overload self-protective function. Since it is usually a pump of dry clearance seal development, if a certain pumping speed rate and an greatest vacuum have to be obtained, it is needed to provide a lower inlet pressure for lowering the back flow, therefore, a pump should be backed in use, roots vacuum pump must be began soon just after its inlet strain reaches a permissible value for economization.
It truly is allow to select unique sorts of pump since the backing pump for factual specifications, such as oil seal pump and liquid ring vacuum pump. When pumping the gas containing large amount of vapor, the liquid ring vacuum pump may be the perfect backing pump.
