Working Principle and Features:
The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a consistent speed 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 certain relative positions. They are really close to to each other and to the housing without the need of real contacting, so lubrication is pointless while in the working housing. The cautiously balanced working parts and higher precision bevel wheels ensue the pump be operated stably and continuously beneath the ailment of high-pressure difference. Dynamic seal aspect use our patent technological innovation and imported oil seals, the vibration level of shaft 
on the shaft seals is controlled to much less than 0.02mm.
A gravity valve is installed in between the suction and exhaust part of the pump. The function on the gravity valve is as follows, once the strain distinction among the suction and exhaust element is over the bodyweight from the valve, the valve opens immediately, which makes the pressure big difference generally hold in a fixed controllable value, the value is the allowable highest pressure variation to be sure the pump do the job typically and to ensure in truth, 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 increased pace at relatively reduced inlet pressure and it’s possessed overload self-protective function. Since it is really a pump of dry clearance seal construction, if a certain pumping pace rate and an ultimate vacuum should be obtained, it truly is necessary to provide a decrease inlet pressure for minimizing the back flow, hence, a pump needs to be backed in use, roots vacuum pump needs to be began soon after its inlet stress reaches a permissible value for economization.
It can be permit to pick unique types of pump since the backing pump for factual prerequisites, such as oil seal pump and liquid ring vacuum pump. When pumping the fuel containing substantial volume of vapor, the liquid ring vacuum pump is the suitable backing pump.
