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 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’re near to one another and to the housing devoid of real contacting, so lubrication is unnecessary within the operating housing. The thoroughly balanced working parts and higher precision bevel wheels ensue the pump be operated stably and continuously under the issue of high-pressure big difference. Dynamic seal element uses our patent technology and imported oil seals, the vibration amount of shaft over the shaft seals is controlled to significantly less than 0.02mm. A gravity valve is set up involving the suction and exhaust part of the pump. The perform on the gravity valve is as follows, once the strain difference concerning the suction and exhaust component is in excess of the bodyweight from the valve, the valve opens automatically, which can make the pressure difference normally maintain inside a fixed controllable value, the value could be the allowable highest stress difference to make certain the pump get the job done normally and in order that in fact, the roots vacuum pump with overflow valve is often a form of overload self-protective pump. Series SYF roots vacuum pump with overflow valve has substantially higher speed at rather reduce inlet pressure and it truly is possessed overload self-protective function. Since it can be a pump of dry clearance seal building, if a specific pumping velocity rate 15 and an greatest vacuum must be obtained, it can be important to provide a reduce inlet strain for reducing the back flow, hence, a pump need to be backed in use, roots vacuum pump must be started soon following its inlet pressure reaches a permissible value for economization. It is allow to select unique varieties of pump since the backing pump for factual specifications, such as oil seal pump and liquid ring vacuum pump. When pumping the gasoline containing big level of vapor, the liquid ring vacuum pump is definitely the great backing pump.