Operating Principle and Options:
The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a continuous speed within the pump housing for suction and exhaust of gas. Two rotors are supported by two bearings and synchronized by a gear, which guarantees these two rotors in certain relative positions. They are close to to each other and to the housing without having real contacting, so lubrication is unnecessary while in the working housing. The meticulously balanced operating parts and high precision bevel wheels ensue the pump be operated stably and continuously underneath the situation of high-pressure difference. Dynamic seal portion use our patent technologies and imported oil seals, the vibration level of shaft about the shaft seals is managed to significantly less than 0.02mm.
A gravity valve is installed between the suction and exhaust a part of the pump. The perform with the gravity valve is as follows, when the strain distinction involving the suction and exhaust component is more than the fat of your valve, the valve opens 
instantly, which tends to make the pressure distinction usually preserve in a fixed controllable worth, the value would be the allowable highest pressure variation to make sure the pump function usually and so that the truth is, the roots vacuum pump with overflow valve is really a form of overload self-protective pump.
Series SYF roots vacuum pump with overflow valve has substantially greater speed at reasonably reduce inlet pressure and it really is possessed overload self-protective perform. Since it is actually a pump of dry clearance seal construction, if a specific pumping pace fee and an ultimate vacuum have to be obtained, it is actually essential to supply a lower inlet stress for decreasing the back flow, consequently, a pump have to be backed in use, roots vacuum pump must be begun soon immediately after its inlet strain reaches a permissible worth for economization.
It is permit to select distinctive varieties of pump as the backing pump for factual specifications, such as oil seal pump and liquid ring vacuum pump. When pumping the fuel containing large quantity of vapor, the liquid ring vacuum pump could be the ideal backing pump.
