Operating Principle and Characteristics:
The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a constant velocity 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 specified relative positions. They are close to to one another and to the housing without having real contacting, so lubrication is needless while in the doing work housing. The carefully balanced operating parts and large precision bevel wheels ensue the pump be operated stably 
and constantly underneath the affliction of high-pressure variation. Dynamic seal component use our patent technologies and imported oil seals, the vibration level of shaft around the shaft seals is controlled to much less than 0.02mm.
A gravity valve is put in involving the suction and exhaust a part of the pump. The perform from the gravity valve is as follows, when the stress difference involving the suction and exhaust portion is over the bodyweight with the valve, the valve opens automatically, which can make the stress variation often preserve in the fixed controllable value, the value is definitely the allowable highest pressure variation to make sure the pump operate normally and in order that in actual fact, the roots vacuum pump with overflow valve is often a kind of overload self-protective pump.
Series SYF roots vacuum pump with overflow valve has considerably higher velocity at relatively lower inlet pressure and it really is possessed overload self-protective perform. As it is a pump of dry clearance seal construction, if a certain pumping velocity charge and an ultimate vacuum have to be obtained, it is actually necessary to supply a reduced inlet stress for cutting down the back movement, hence, a pump needs to be backed in use, roots vacuum pump need to be commenced quickly just after its inlet pressure reaches a permissible worth for economization.
It can be permit to pick distinctive varieties of pump as the backing pump for factual necessities, such as oil seal pump and liquid ring vacuum pump. When pumping the gasoline containing significant volume of vapor, the liquid ring vacuum pump will be the suitable backing pump.
