Operating Principle and Features: 　　The series SYF roots vacuum pump is with overflow valve. The figure-of-eight rotors are counter-rotating at a constant speed inside the pump housing for suction and exhaust of gas. Two rotors are supported by two bearings and synchronized by a gear, which ensures these two rotors in certain relative positions. They are near to one another and to the housing without actual contacting, so lubrication is unnecessary in the working housing. The carefully balanced operating parts and high precision bevel wheels ensue the pump be operated stably and continuously under the condition of high-pressure difference. Dynamic seal part use our patent technology and imported oil seals, the vibration amount of shaft on the shaft seals is controlled to less than 0.02mm. 　　A gravity valve is installed between the suction and exhaust part of the pump. The function of the gravity valve is as follows, when the pressure difference between the suction and exhaust part is over the weight of the valve, the valve opens automatically, which makes the pressure difference always keep in a fixed controllable value, the value is the allowable highest pressure difference to ensure the pump work normally and so that in fact, the roots vacuum pump with overflow valve is a kind of overload self-protective pump. 　　Series SYF roots vacuum pump with overflow valve has substantially higher speed at relatively lower inlet pressure and it is possessed overload self-protective function. Because it is a pump of dry clearance seal construction, if a certain pumping speed rate and an ultimate vacuum need to be obtained, it is necessary to supply a lower inlet pressure for reducing the back flow, therefore, a pump must be backed in use, roots vacuum pump should be started soom after its inlet pressure reaches a permissible value for economization. 　　It is permit to select different kinds of pump as the backing pump for factual requirements, such as oil seal pump and liquid ring vacuum pump. When pumping the gas containing large amount of vapor, the liquid ring vacuum pump is the ideal backing pump.

SYF-150	SYF-300
SYF-600	SYF-1200(Patent Product)
ZJP-1800(Patent Product)	ZJP-2500(Patent Product)
Performance Parameter:

 

Series ZJ-150A Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(l/s) Inlet/Outlet Dia(mm) Max.Permiss able Diff.Pressure Motor Power（kw） Recom-ended Backing Pump Pa Torr Pa Torr ZJ-150A 5?0-2 3.7?0-4 150 100/100 8?03 75 2.2 2H-30A

 

Series ZJ-300 Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(l/s) Inlet/Outlet Dia(mm) Max.Permiss able Diff.Pressure Motor Power（kw） Recom-ended Backing Pump Pa Torr Pa Torr ZJ-300 5?0-2 3.7?0-4 300 150/150 6?03 45 4 2H-70A 1?0-1 8?0-4 H-70B

 

Series ZJ-600 Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(l/s) Inlet/Outlet Dia(mm) Max.Permiss able Diff.Pressure Motor Power（kw） Recom-ended Backing Pump Pa Torr Pa Torr ZJ-600 5?0-2 3.7?0-4 600 250/150 4.5?03 40 7.5 2H-70A 1?0-1 8?0-4 H-150

 

Series ZJ-1200B Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(l/s) Inlet/Outlet Dia(mm) Max.Permiss able Diff.Pressure Motor Power（kw） Recom-ended Backing Pump Pa Torr Pa Torr ZJ-1200B 1?0-1 8?0-4 1200 250/200 4?03 30 11 H-150 5?0-2 3.7?0-4 ZJ300/2H-70A

 

Series ZJ-5000 Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(l/s) Inlet/Outlet Dia(mm) Max.Permiss able Diff.Pressure Motor Power（kw） Recom-ended Backing Pump Pa Torr Pa Torr ZJ-5000 5?0-2 3.7?0-4 5000 400/320 3?03 22.5 45 ZJ1200/H-300

 

Series ZJ-10000 Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(l/s) Inlet/Outlet Dia(mm) Max.Permiss able Diff.Pressure Motor Power（kw） Recom-ended Backing Pump Pa Torr Pa Torr ZJ-10000 5?0-2 3.7?0-4 10000 500/400 2.5?03 19 55 ZJ1200/H-300

 

Series ZJ-20000 Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(l/s) Inlet/Outlet Dia(mm) Max.Permiss able Diff.Pressure Motor Power（kw） Recom-ended Backing Pump Pa Torr Pa Torr ZJ-20000 5?0-2 3.7?0-4 20000 630/500 2?03 15 75 ZJ5000/ZJ1200/H-150

 

Series ZJP-30A Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(L/S) Diff.Permiss at overflow Value Inlet/Outlet Dia. (mm) Motor Power(kw) Recomm-ended Backing pumps pa Torr pa Torr ZJP-30A 5?/span>10-2 3.7?/span>10-4 30 4?/span>103 30 50/40 0.75 2H-8

 

Series ZJP-70A Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(L/S) Diff.Permiss at overflow Value Inlet/Outlet Dia.(mm) Motor Power(Kw) Recomm-ended Backing pumps pa Torr pa Torr ZJP-70A 5?/span>10-2 3.7?/span>10-4 70  4?/span>103 30 80/50 1.1 2H-15

 

Series ZJP-150 Roots Vacuum Pumps

Moter Uitimate Pressure Pumping speed(L/S) Diff.Permiss at overflow Value Inlet/Outlet Dia.(mm) Motor Power（kw） Recomm-ended Backing pumps pa Torr pa Torr ZJP-150 5?0-2 3.7?0-4 150 4?03 30 100/100 2.2 2H-15,2H-30A

 

Series ZJP-300 Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(L/S) Diff.Permiss at overflow Value Inlet/Outlet Dia.(mm) Motor Power（kw） Recomm-ended Backing pumps pa Torr pa Torr ZJP-300 5?0-2 3.7?0-4 300 4?03 30 150/150 4  2H-30A,2H-70A

 

Series ZJP-600 Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(L/S) Diff.Permiss at overflow Value Inlet/Outlet Dia. (mm) Motor Power（kw） Recomm-ended Backing pumps pa Torr pa Torr ZJP-600 5?0-2 3.7?0-4 600 2.7?03 20 200/200 7.5  2H-70A

 

Series ZJP-1200B Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(L/S) Diff.Permiss at overflow Val Inlet/Outlet Dia. (mm) Motor Power（kw） Recomm-ended Backing pumps pa Torr pa Torr ZJP-1200B 5?0-2 3.7?0-4 1200 2.7?03 20 250/200 11 ZJ300/H-70B

 

Series ZJP-2500 Roots Vacuum Pumps

Model Uitimate Pressure Pumping speed(L/S) Diff.Permiss at overflow Value Inlet/Outlet Dia. (mm) Motor Power（kw） Recomm-ended Backing pumps pa Torr pa Torr ZJP-2500 5?0-2 3.7?0-4 2500 2.7?03 20 320/320 22  ZJ600/H-150

Vacuum pumps

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