Operating Principle and Attributes:
The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a constant pace within the pump housing for suction and exhaust of fuel. Two rotors are supported by two bearings and synchronized by a gear, which guarantees these two rotors in certain relative positions. They are near to one another and to the housing without having real contacting, so lubrication is needless within the working housing. The meticulously balanced operating elements and large precision bevel wheels ensue the pump be operated stably and continuously underneath the situation of high-pressure variation. Dynamic seal part use our patent engineering and imported oil seals, the vibration amount of shaft around the shaft seals is controlled to much less than 0.02mm.
A gravity valve is set up concerning the suction and exhaust part of the pump. The perform on the gravity valve is as follows, once the strain difference among the suction and exhaust portion is above the bodyweight of the valve, the valve opens automatically, which helps make the stress distinction generally retain in the fixed controllable worth, the value would be the allowable highest stress distinction to make certain the pump work 
normally and to ensure that in actual fact, the roots vacuum pump with overflow valve is a kind of overload self-protective pump.
Series SYF roots vacuum pump with overflow valve has substantially greater pace at comparatively decrease inlet pressure and it is possessed overload self-protective perform. Since it is actually a pump of dry clearance seal development, if a particular pumping pace charge and an greatest vacuum have to be obtained, it truly is necessary to supply a reduced inlet strain for cutting down the back movement, hence, a pump have to be backed in use, roots vacuum pump need to be began quickly following its inlet stress reaches a permissible value for economization.
It can be permit to pick diverse varieties of pump since the backing pump for factual necessities, such as oil seal pump and liquid ring vacuum pump. When pumping the gasoline containing massive volume of vapor, the liquid ring vacuum pump could be the ideal backing pump.
