Working Principle and Options: 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 gasoline. Two rotors are supported by two bearings and synchronized by a gear, which ensures these two rotors in selected relative positions. They’re near to each other and to the housing devoid of actual contacting, so lubrication is pointless in the functioning housing. The meticulously balanced working parts and substantial precision bevel wheels ensue the pump be operated stably and continuously underneath the situation of high-pressure difference. Dynamic seal part utilizes our patent engineering and imported oil seals, the vibration volume of shaft around the shaft seals is controlled to less than 0.02mm. A gravity valve is put in amongst the suction and exhaust part of the pump. The function with the gravity valve is as follows, when the pressure distinction in between the suction and exhaust aspect is over the weight of the valve, the valve opens automatically, which helps make the strain variation often retain within a fixed controllable worth, the value is the allowable highest strain distinction to be sure the pump operate usually and to ensure in actual fact, the roots vacuum pump with overflow valve is actually a form of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has considerably greater speed at rather lower inlet stress and it truly is possessed overload self-protective function. Because it can be a pump of dry clearance seal construction, if a particular pumping speed charge 15 and an greatest vacuum have to be obtained, it is actually necessary to provide a reduce inlet pressure for lowering the back flow, as a result, a pump has to be backed in use, roots vacuum pump needs to be commenced quickly following its inlet stress reaches a permissible value for economization. It truly is permit to pick distinct types of pump as the backing pump for factual specifications, this kind of as oil seal pump and liquid ring vacuum pump. When pumping the fuel containing massive amount of vapor, the liquid ring vacuum pump is the ideal backing pump.