Working Principle and Capabilities: The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a consistent velocity within 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 particular relative positions. These are close to to one another and also to the housing without the need of real contacting, so lubrication is unnecessary from the operating housing. The cautiously balanced working elements and high precision bevel wheels ensue the pump be operated stably and constantly underneath the condition of high-pressure difference. Dynamic seal aspect employs our patent engineering 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 among the suction and exhaust part of the pump. The perform of your gravity valve is as follows, when the strain variation involving the suction and exhaust part is over the excess weight of the valve, the valve opens immediately, which tends to make the stress big difference normally continue to keep inside a fixed controllable value, the worth is the allowable highest strain difference to make certain the pump function usually and in order that in truth, the roots vacuum pump with overflow valve can be a type of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has substantially higher speed at fairly decrease inlet strain and it is actually possessed overload self-protective perform. Because it is often a pump of dry clearance seal construction, if a certain pumping speed rate 15 and an ultimate vacuum need to be obtained, it truly is essential to supply a lower inlet stress for decreasing the back flow, as a result, a pump have to be backed in use, roots vacuum pump ought to be began quickly immediately after its inlet pressure reaches a permissible worth for economization. It is actually permit to pick different varieties of pump since the backing pump for factual needs, such as oil seal pump and liquid ring vacuum pump. When pumping the gas containing large quantity of vapor, the liquid ring vacuum pump may be the great backing pump.