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Gas-Cooling Roots Pumps

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Description

The series LQ 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 LQ 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.

Series LQ-75 Gas-Cooling Roots Pumps

 

Model
Pumping Speed
Ultimate Pressure hPa(Torr)
Max.Permissable Diff.pressure
Permissable Power-used Range(Kw)
L/S
m3/min
With Backing Pump
With Backing Pump
Pa
Torr
LQ-75
75 
4.5
5?0-2
(3.7?0-4)
1.6?04 (120)
8.4?04
640
1.1~7.5

 

Series LQ-150 Gas-Cooling Roots Pumps

 

 

Model
Pumping Speed
Ultimate Pressure hPa(Torr)
Max.Permissable Diff.pressure
Permissable Power-used Range(Kw)
L/S
m3/min
With Backing Pump
Wo Backing Pump
Pa
Torr
LQ-150
150
9
5?0-2
(3.7?0-4)
1.6?04 (120)
8.4?04
640
2.2~15
 

 

Series LQ-300 Gas-Cooling Roots Pumps

 

Model
Pumping Speed
Ultimate Pressure hPa(Torr)
Max.Permissable Diff.pressure
Permissable Power-used Range(Kw)
L/S
m3/min
With Backing Pump
Wo Backing Pump
Pa
Torr
LQ-300
300
18
5?0-2
(3.7?0-4)
1.6?04 (120)
8.4?04
640
4~30

 

Series LQ-450 Gas-Cooling Roots Pumps

 

Model
Pumping Speed
Ultimate Pressure hPa(Torr)
Max.Permissable Diff.pressure
Permissable Power-used Range(Kw)
L/S
m3/min
With Backing Pump
Wo Backing Pump
Pa
Torr
LQ-450
400
24
5?0-2
(3.7?0-4)
1.3?04 (100)
8.7?04
660
5.5~45

 

Series LQ-600 Gas-Cooling Roots Pumps

 

Model
Pumping Speed
Ultimate Pressure hPa(Torr)
Max.Permissable Diff.pressure
Permissable Power-used Range(Kw)
L/S
m3/min
With Backing Pump
Wo Backing Pump
Pa
Torr
LQ-600
600
36
5?0-2
(3.7?0-4)
1.3?04 (120)
8.4?04
660
7.5~75

 

Series LQ-900 Gas-Cooling Roots Pumps

 

Model
Ultimate Pressure hPa(Torr)
Ultimate Pressure hPa(Torr)
Max.Permissable Diff.pressure
Permissable Power-used Range(Kw)
L/S
m3/min
With Backing Pump
Wo Backing Pump
Pa
Torr
LQ-900
800
48
5?0-2
(3.7?0-4)
1.3?04 (120)
8.7?04
660
11~90

 

Series LQ-1200 Gas-Cooling Roots Pumps

 

Model
Pumping Speed
Ultimate Pressure hPa(Torr)
Max.Permissable Diff.pressure
Permissable Power-used Range(Kw)
L/S
m3/min
With Backing Pump
Wo Backing Pump
Pa
Torr
LQ-1200
1200
72
5?0-2
(3.7?0-4)
1.3?04 (120)
8.7?04
660
11~135

 

Series LQ-1800 Gas-Cooling Roots Pumps

 

Model
Pumping Speed
Ultimate Pressure hPa(Torr)
Wo Backing Pump
Permissable Power-used Range(Kw)
L/S
m3/min
With Backing Pump
Wo Backing Pump
Pa
Torr
LQ-1800
1800
108
5?0-2
(3.7?0-4)
1.3?04 (120)
8.7?04
660
15~200

 

series LQ Gas-Cooling Roots Pumps

 

Model
Pumping Speed
ate Pressure hPa(Torr)
Max.Permissable Diff.pressure
Permissable Power-used Range(Kw)
L/S
m3/min
With Backing Pump
Wo Backing Pump
Pa
Torr
LQ-2500
2500
150
5?0-2
(3.7?0-4)
1.3?04 (120)
8.7?04
660 
18.5~280

 

series LQ-3600 Gas-Cooling Roots Pumps

 

Model
Pumping Speed
Ultimate Pressure hPa(Torr)
Max.Permissable Diff.pressure
Permissable Power-used Range(Kw)
L/S
m3/min
With Backing Pump
Wo Backing Pump
Pa
Torr
LQ-3600
3750
216
5?0-2
(3.7?0-4)
1.3?04 (100)
8.7?04
660
30~350

 

Series LQ-5000 Gas-Cooling Roots Pumps

 

Model
Pumping Speed
Ultimate Pressure hPa(Torr)
Max.Permissable Diff.pressure
Permissable Power-used Range(Kw)
L/S
m3/min
With Backing Pump
Wo Backing Pump
Pa
Torr
LQ-5000
5000
300
5?0-2
(3.7?0-4)
1.3?04 (100)
8.7?04
660
37~410