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Series ZJP Roots Vacuum Pumps

   
     The series ZJP 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 pair of gear, which ensure these two rotors in certain relative positions. They are near to one anther and to the housing without actual contacting ,so lubrication is unnecessary in the working housing. The carefully balance operating parts and high precision bevel wheels ensure 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 of shaft at the shaft seals is controlled to less than 0.02mm against oil leaking. 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 valve,This valve 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 ZJP roots vacuum pump with overflow valve has substantially higher speed at relatively lower inlet pressure and it is possessed overload self-prtotecive function . The Pump is machined by CNC manufacturing center. "O" rings are used for sealing the pump body, two sidecovers and two end covers. All parts of pump have good compatibility, so the overhaulis very easy. The pump can't be operated in dividually and should be used in connection with backing vacuum pump. The screw pump, oil seal pump and water ring pump are all suitable as backing pump for Roots pump. The Roots pump can beused to pump a mass of condensable gases when it connected with a screw pumkp or water ring pump.
 
Construction Scheme
   
     1.Pump housing
     2.Rotor
     3.4.Gas outlet      5.Poise
     6.Pilot valve cover      7.Gas inlet
 
 
Performance Parameter
   
Model
Ultimate Partial Pressure
(Pa)
Pumping Speed
(L/S)
Pressure diff.at Overflow Valve(HPa)
Inlet Diam.
(mm)
Outlet Diam.(mm)
Motor Power
(kw)
Recommended Backing Pump
Cooling Water Consumptoin
(L/min)
Weight
(KG)
ZJP-30
ZJPC-30
3x10-2
30
40
50
40
0.75
2XZ-8
4
-
80
ZJP-70
ZJPC-70
70
40
80
50
1.1
2XZ-12
4
-
98
ZJP-70D
ZJPC-70D
70
48
100
100
1.5
2H-15
5
-
220
ZJP-150
ZJPC-150
150
48
100
100
2.2
2H-30
5
-
220
ZJP-300
ZJPC-300
5x10-2
300
58
150
150
4
HGL-70
6
-
310
ZJP-600
ZJPC-600
600
32
200
200
7.5
HG-150
HGL-150
8
630
ZJP-1200
ZJPC-1200
1200
44
250
200
11
HG-150
HGL-150
10
815
ZJP-1800
ZJPC-1800
1800
32
250
250
15
ZJP-600
HGL-150
12
1200
ZJP-2500
ZJPC-2500
2500
44
320
320
18.5
ZJP-600
HGL-150
12
1500

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