Working Principle and Options:
The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a frequent 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 operating elements and high precision bevel wheels ensue the pump be operated stably and continuously underneath the condition of high-pressure distinction. Dynamic seal aspect use our patent technological innovation and imported oil seals, the vibration level of shaft to the shaft seals is controlled to much less than 0.02mm.
A gravity valve is set up in between the suction and exhaust a part of the pump. The function on the gravity valve 
is as follows, once the pressure variation concerning the suction and exhaust aspect is over the weight on the valve, the valve opens automatically, which tends to make the stress distinction generally keep in a fixed controllable value, the value could be the allowable highest pressure variation to make sure the pump operate usually and to ensure that in truth, the roots vacuum pump with overflow valve is usually a variety of overload self-protective pump.
Series SYF roots vacuum pump with overflow valve has substantially higher speed at fairly reduce inlet pressure and it is actually possessed overload self-protective function. Since it is a pump of dry clearance seal development, if a certain pumping speed price and an ultimate vacuum must be obtained, it is needed to supply a reduce inlet pressure for lowering the back flow, therefore, a pump has to be backed in use, roots vacuum pump must be began soon after its inlet strain reaches a permissible value for economization.
It can be allow to select distinctive kinds of pump since the backing pump for factual requirements, this kind of as oil seal pump and liquid ring vacuum pump. When pumping the gas containing big amount of vapor, the liquid ring vacuum pump may be the best backing pump.
