Working Principle and Functions:
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 gas. Two rotors are supported by two bearings and synchronized by a gear, which ensures these two rotors in sure relative positions. They are near to one another and to the housing devoid of real contacting, so lubrication is unnecessary inside the functioning housing. The thoroughly balanced working elements and large precision bevel wheels ensue the pump be operated stably and constantly below the condition of high-pressure variation. Dynamic seal aspect use our patent technology and imported oil seals, the vibration amount of shaft about the shaft seals is controlled to much less than 0.02mm.
A gravity valve is set up amongst the suction and exhaust a part of the pump. The perform of the gravity valve is as follows, once the stress big difference concerning the suction and exhaust aspect is more than the bodyweight of the valve, the valve opens immediately, which can make the strain distinction always maintain inside a fixed controllable value, the value is the allowable highest strain difference to be sure the pump do the job ordinarily and so that actually, the roots vacuum pump with overflow valve is really a kind of overload self-protective pump.
Series SYF roots vacuum pump with overflow valve has considerably increased velocity at comparatively lower inlet pressure and it truly is possessed overload self-protective function. Because it is actually a pump of dry clearance seal building, if a certain pumping speed rate and an greatest vacuum have to be obtained, it can be needed to supply a decrease inlet pressure for cutting down the back flow, for that reason, a pump must be backed in use, roots vacuum pump ought to be began quickly right after its inlet strain reaches a permissible value for economization.
It can be allow to pick unique kinds of pump because the backing pump for factual necessities, this kind of as oil seal pump and liquid ring vacuum pump. When pumping the 
fuel containing big amount of vapor, the liquid ring vacuum pump could be the great backing pump.
