Product Overview
The GDL vertical, easy-dismantling multistage clean-water pump is a vertical multistage centrifugal unit designed with modular and enclosed structure. It is developed specifically for high-rise building water supply, fire protection, and building service systems. With a compact structure, stable operation, and easy maintenance, it is ideal for booster systems and pump rooms requiring high continuity, safety, and space efficiency.
Model Designation
Key Features
-
Compact vertical multistage design with small footprint, suitable for limited space installation; optional protective cover available for outdoor use.
-
Impellers are directly mounted on the motor shaft, ensuring coaxial alignment for smooth operation and extended service life.
-
Mechanical seal or cartridge seal system equipped with high-hardness alloy seal rings offers high wear resistance and long seal life.
-
Equal-diameter suction and discharge ports; inlet/outlet orientation configurable at 0°, 90°, 180°, or 270°; supports series or parallel operation; head adjustable via stage count or impeller trimming.
Engineering Summary
The GDL pump adopts a sealed close-coupled structure with a reliable hydraulic model design, ensuring high hydraulic efficiency and stable head–flow characteristics. It is directly coupled to a Y-series three-phase asynchronous motor via a clamp-type coupling, achieving high alignment accuracy and reducing vibration and noise. With strong structural rigidity, standardized motor configuration, and easy maintenance design, it is suitable for integrated pump room applications and long-term continuous operation.
Typical Applications
-
Constant-pressure water supply and boosting for high-rise and super high-rise buildings
-
Main supply and pressure stabilization for fire hydrant and automatic sprinkler systems
-
Centralized water supply for public buildings such as hotels, hospitals, and office towers
-
Make-up and circulation water for cooling towers, system pressure balancing
-
Boiler feedwater and long-distance clean water transfer
Suitable for clean water at temperatures up to 80°C; hot water versions can handle up to 105°C. With appropriate materials and defined operating conditions, it can also transport non-corrosive liquids with physical and chemical properties similar to water, ensuring stable and reliable system performance.
System & Operation
Components & Supply
-
Pump and motor adopt a close-coupled direct-drive structure, forming a rigid unit that requires no on-site alignment.
-
Driven by a standard Y-series three-phase asynchronous motor, with good interchangeability and ease of maintenance.
-
Clamp-type coupling ensures coaxial alignment between pump and motor shafts for smooth, stable transmission.
-
The modular design allows easy disassembly for mechanical seal replacement and internal inspection
Technical Specifications
Operating Conditions
-
The pumped medium should be physically and chemically similar to clean water, non-corrosive, particle-free, and with viscosity ≤150 mm²/s.
-
Suitable temperature range: −15°C to 120°C; standard models up to 80°C; hot-water versions up to 105°C.
-
Maximum system working pressure: ≤2.5 MPa.
-
Installation altitude should not exceed 1000 m; for higher elevations, specify at time of order for proper configuration.
Service Conditions
-
Ambient temperature ≤40°C; relative humidity ≤95%.
-
Indoor installation is recommended; outdoor installations require protective covers and proper environmental protection.
-
Avoid explosive or corrosive atmospheres and extreme humidity or heat.
-
Adequate ventilation and a stable foundation are essential to prevent vibration during operation.
Protection Functions
-
Motor should be equipped with thermal overload protection to prevent damage under overcurrent conditions.
-
Level or flow sensors can be installed to prevent dry running.
-
Check valves are recommended in discharge lines to prevent reverse flow and water hammer.
-
Overpressure protection devices should be included to ensure system pressure remains within rated limits (≤2.5 MPa).
Selection Criteria
-
Select pump model and number of stages based on system head and flow requirements, ensuring duty point falls within high-efficiency range.
-
Choose standard or hot-water configuration according to medium temperature and characteristics; for special media, select appropriate materials and seals.
-
Consider installation environment (indoor/outdoor/high altitude) to define motor protection level and structural configuration.
-
Confirm whether the system requires series or parallel operation and ensure inlet/outlet orientation (0°/90°/180°/270°) suits piping layout.
-
For continuous-duty or high-availability systems, consider standby pump or dual-pump switching to ensure uninterrupted operation and maintainability.
Installation & Dimensions
Outline Drawing
 |
Serial No.
|
Name
|
Serial No.
|
Name
|
|
1
|
Pump Body
|
11
|
Coupling
|
|
|
2
|
Tightening Bolt
|
12
|
Connecting Seat
|
|
|
3
|
Outer Casing
|
13
|
Air Nozzle
|
|
|
4
|
Impeller
|
14
|
Mechanical Seal
|
|
|
5
|
Impeller Sleeve
|
15
|
Shaft
|
|
|
6
|
Shaft Sleeve
|
16
|
Middle Section
|
|
|
7
|
Seal Gasket
|
17
|
Shaft Sleeve Nut
|
|
|
8
|
Nut
|
18
|
Sleeve Bearing
|
|
|
9
|
Pin
|
19
|
Return Pipe Assembly
|
|
|
10
|
Motor
|
Performance Curves
Performance Parameters
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
25GDL2-12
|
3
|
2
|
36
|
2900
|
1.1
|
30
|
2.9
|
58
|
|
25GDL2-12
|
4
|
2
|
48
|
2900
|
1.1
|
30
|
2.9
|
62
|
|
25GDL2-12
|
5
|
2
|
60
|
2900
|
2
|
30
|
2.9
|
68
|
|
25GDL2-12
|
6
|
2
|
72
|
2900
|
2
|
30
|
2.9
|
72
|
|
25GDL2-12
|
7
|
2
|
84
|
2900
|
2
|
30
|
2.9
|
78
|
|
25GDL2-12
|
8
|
2
|
96
|
2900
|
2.2
|
30
|
2.9
|
82
|
|
25GDL2-12
|
9
|
2
|
108
|
2900
|
2
|
30
|
2.9
|
86
|
|
25GDL2-12
|
10
|
2
|
120
|
2900
|
3
|
30
|
2.9
|
98
|
|
25GDL2-12
|
11
|
2
|
132
|
2900
|
3
|
30
|
2.9
|
102
|
|
25GDL2-12
|
12
|
2
|
144
|
2900
|
3
|
30
|
2.9
|
|
|
25GDL2-12
|
13
|
2
|
156
|
2900
|
4
|
30
|
2.9
|
|
|
25GDL2-12
|
14
|
2
|
168
|
2900
|
4
|
30
|
2.9
|
|
|
25GDL2-12
|
15
|
2
|
180
|
2900
|
4
|
30
|
2.9
|
|
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
25GDL4-11
|
3
|
4
|
33
|
2900
|
1.1
|
42
|
2.9
|
58
|
|
25GDL4-11
|
4
|
4
|
44
|
2900
|
1.5
|
42
|
2.9
|
65
|
|
25GDL4-11
|
5
|
4
|
55
|
2900
|
2.2
|
42
|
2.9
|
72
|
|
25GDL4-11
|
6
|
4
|
66
|
2900
|
2.2
|
42
|
2.9
|
76
|
|
25GDL4-11
|
7
|
4
|
77
|
2900
|
3
|
42
|
2.9
|
86
|
|
25GDL4-11
|
8
|
4
|
88
|
2900
|
3
|
42
|
2.9
|
90
|
|
25GDL4-11
|
9
|
4
|
99
|
2900
|
3
|
42
|
2.9
|
94
|
|
25GDL4-11
|
10
|
4
|
110
|
2900
|
4
|
42
|
2.9
|
110
|
|
25GDL4-11
|
11
|
4
|
121
|
2900
|
4
|
42
|
2.9
|
114
|
|
25GDL4-11
|
12
|
4
|
132
|
2900
|
4
|
42
|
2.9
|
|
|
25GDL4-11
|
13
|
4
|
143
|
2900
|
4
|
42
|
2.9
|
|
|
25GDL4-11
|
14
|
4
|
154
|
2900
|
5.5
|
42
|
2.9
|
|
|
25GDL4-11
|
15
|
4
|
165
|
2900
|
5.5
|
42
|
2.9
|
|
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
40GDL6-12
|
3
|
6
|
36
|
2900
|
1.5
|
52
|
2.9
|
72
|
|
40GDL6-12
|
4
|
6
|
48
|
2900
|
2.2
|
52
|
2.9
|
78
|
|
40GDL6-12
|
5
|
6
|
60
|
2900
|
2.2
|
52
|
2.9
|
82
|
|
40GDL6-12
|
6
|
6
|
72
|
2900
|
3
|
52
|
2.9
|
92
|
|
40GDL6-12
|
7
|
6
|
84
|
2900
|
3
|
52
|
2.9
|
96
|
|
40GDL6-12
|
8
|
6
|
96
|
2900
|
4
|
52
|
2.9
|
112
|
|
40GDL6-12
|
9
|
6
|
108
|
2900
|
4
|
52
|
2.9
|
116
|
|
40GDL6-12
|
10
|
6
|
120
|
2900
|
4
|
52
|
2.9
|
120
|
|
40GDL6-12
|
11
|
6
|
132
|
2900
|
5.5
|
52
|
2.9
|
140
|
|
40GDL6-12
|
12
|
6
|
144
|
2900
|
5.5
|
52
|
2.9
|
|
|
40GDL6-12
|
13
|
6
|
156
|
2900
|
7.5
|
52
|
2.9
|
|
|
40GDL6-12
|
14
|
6
|
168
|
2900
|
7.5
|
52
|
2.9
|
|
|
40GDL6-12
|
15
|
6
|
180
|
2900
|
7.5
|
52
|
2.9
|
|
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
50GDL12-15
|
2
|
12
|
30
|
2900
|
2.2
|
57
|
3.5
|
113
|
|
50GDL12-15
|
3
|
12
|
45
|
2900
|
3
|
57
|
3.5
|
129
|
|
50GDL12-15
|
4
|
12
|
60
|
2900
|
4
|
57
|
3.5
|
149
|
|
50GDL12-15
|
5
|
12
|
75
|
2900
|
5.5
|
57
|
3.5
|
181
|
|
50GDL12-15
|
6
|
12
|
90
|
2900
|
5.5
|
57
|
3.5
|
190
|
|
50GDL12-15
|
7
|
12
|
105
|
2900
|
7.5
|
57
|
3.5
|
204
|
|
50GDL12-15
|
8
|
12
|
120
|
2900
|
7.5
|
57
|
3.5
|
212
|
|
50GDL12-15
|
9
|
12
|
135
|
2900
|
11
|
57
|
3.5
|
265
|
|
50GDL12-15
|
10
|
12
|
150
|
2900
|
11
|
57
|
3.5
|
273
|
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
50GDL18-15
|
2
|
18
|
30
|
2900
|
3
|
63
|
4.0
|
122
|
|
50GDL18-15
|
3
|
18
|
45
|
2900
|
4
|
63
|
4.0
|
142
|
|
50GDL18-15
|
4
|
18
|
60
|
2900
|
5.5
|
63
|
4.0
|
175
|
|
50GDL18-15
|
5
|
18
|
75
|
2900
|
7.5
|
63
|
4.0
|
189
|
|
50GDL18-15
|
6
|
18
|
90
|
2900
|
7.5
|
63
|
4.0
|
198
|
|
50GDL18-15
|
7
|
18
|
105
|
2900
|
11
|
63
|
4.0
|
252
|
|
50GDL18-15
|
8
|
18
|
120
|
2900
|
11
|
63
|
4.0
|
261
|
|
50GDL18-15
|
9
|
18
|
135
|
2900
|
15
|
63
|
4.0
|
280
|
|
50GDL18-15
|
10
|
18
|
150
|
2900
|
15
|
63
|
4.0
|
289
|
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
65GDL24-12
|
2
|
24
|
24
|
2900
|
3
|
63
|
4.0
|
122
|
|
65GDL24-12
|
3
|
24
|
36
|
2900
|
4
|
63
|
4.0
|
142
|
|
65GDL24-12
|
4
|
24
|
48
|
2900
|
5.5
|
63
|
4.0
|
175
|
|
65GDL24-12
|
5
|
24
|
60
|
2900
|
7.5
|
63
|
4.0
|
189
|
|
65GDL24-12
|
6
|
24
|
72
|
2900
|
7.5
|
63
|
4.0
|
252
|
|
65GDL24-12
|
7
|
24
|
84
|
2900
|
11
|
63
|
4.0
|
261
|
|
65GDL24-12
|
8
|
24
|
96
|
2900
|
11
|
63
|
4.0
|
280
|
|
65GDL24-12
|
9
|
24
|
108
|
2900
|
15
|
63
|
4.0
|
289
|
|
65GDL24-12
|
10
|
24
|
120
|
2900
|
15
|
63
|
4.0
|
298
|
|
65GDL24-12
|
11
|
24
|
132
|
2900
|
15
|
63
|
4.0
|
317
|
|
65GDL24-12
|
12
|
24
|
144
|
2900
|
18.5
|
63
|
4.0
|
346
|
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
80GDL36-12
|
2
|
36
|
24
|
2900
|
4
|
71
|
4.2
|
193
|
|
80GDL36-12
|
3
|
36
|
36
|
2900
|
5.5
|
71
|
4.2
|
227
|
|
80GDL36-12
|
4
|
36
|
48
|
2900
|
7.5
|
71
|
4.2
|
244
|
|
80GDL36-12
|
5
|
36
|
60
|
2900
|
11
|
71
|
4.2
|
292
|
|
80GDL36-12
|
6
|
36
|
72
|
2900
|
11
|
71
|
4.2
|
302
|
|
80GDL36-12
|
7
|
36
|
84
|
2900
|
15
|
71
|
4.2
|
322
|
|
80GDL36-12
|
8
|
36
|
96
|
2900
|
15
|
71
|
4.2
|
332
|
|
80GDL36-12
|
9
|
36
|
108
|
2900
|
18.5
|
71
|
4.2
|
365
|
|
80GDL36-12
|
10
|
36
|
120
|
2900
|
18.5
|
71
|
4.2
|
375
|
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
80GDL54-14
|
2
|
54
|
28
|
2900
|
7.5
|
73
|
4.0
|
218
|
|
80GDL54-14
|
3
|
54
|
42
|
2900
|
11
|
73
|
4.0
|
267
|
|
80GDL54-14
|
4
|
54
|
56
|
2900
|
15
|
73
|
4.0
|
287
|
|
80GDL54-14
|
5
|
54
|
70
|
2900
|
18.5
|
73
|
4.0
|
320
|
|
80GDL54-14
|
6
|
54
|
84
|
2900
|
18.5
|
73
|
4.0
|
330
|
|
80GDL54-14
|
7
|
54
|
98
|
2900
|
22
|
73
|
4.0
|
373
|
|
80GDL54-14
|
8
|
54
|
112
|
2900
|
30
|
73
|
4.0
|
400
|
|
80GDL54-14
|
9
|
54
|
126
|
2900
|
30
|
73
|
4.0
|
421
|
|
80GDL54-14
|
10
|
54
|
140
|
2900
|
37
|
73
|
4.0
|
432
|
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
100GDL72-14
|
2
|
72
|
28
|
2900
|
11
|
73
|
4.5
|
276
|
|
100GDL72-14
|
3
|
72
|
42
|
2900
|
15
|
73
|
4.5
|
298
|
|
100GDL72-14
|
4
|
72
|
56
|
2900
|
18.5
|
73
|
4.5
|
336
|
|
100GDL72-14
|
5
|
72
|
70
|
2900
|
22
|
73
|
4.5
|
381
|
|
100GDL72-14
|
6
|
72
|
84
|
2900
|
30
|
73
|
4.5
|
453
|
|
100GDL72-14
|
7
|
72
|
98
|
2900
|
30
|
73
|
4.5
|
466
|
|
100GDL72-14
|
8
|
72
|
112
|
2900
|
37
|
73
|
4.5
|
493
|
|
100GDL72-14
|
9
|
72
|
126
|
2900
|
37
|
73
|
4.5
|
582
|
|
100GDL72-14
|
10
|
72
|
140
|
2900
|
45
|
73
|
4.5
|
595
|
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
100GDL100-20
|
2
|
108
|
40
|
2900
|
18.5
|
74
|
4.5
|
292
|
|
100GDL100-20
|
3
|
108
|
60
|
2900
|
30
|
74
|
4.5
|
430
|
|
100GDL100-20
|
4
|
108
|
80
|
2900
|
37
|
74
|
4.5
|
463
|
|
100GDL100-20
|
5
|
108
|
100
|
2900
|
45
|
74
|
4.5
|
555
|
|
100GDL100-20
|
6
|
108
|
120
|
2900
|
55
|
74
|
4.5
|
640
|
|
100GDL100-20
|
7
|
108
|
140
|
2900
|
75
|
74
|
4.5
|
840
|
|
100GDL100-20
|
8
|
108
|
160
|
2900
|
75
|
74
|
4.5
|
855
|
|
100GDL100-20
|
9
|
108
|
180
|
2900
|
90
|
74
|
4.5
|
870
|
|
100GDL100-20
|
10
|
108
|
200
|
2900
|
90
|
74
|
4.5
|
955
|
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
125GDL100-20
|
2
|
108
|
40
|
2900
|
18.5
|
74
|
4.5
|
292
|
|
125GDL100-20
|
3
|
108
|
60
|
2900
|
30
|
74
|
4.5
|
430
|
|
125GDL100-20
|
4
|
108
|
80
|
2900
|
37
|
74
|
4.5
|
463
|
|
125GDL100-20
|
5
|
108
|
100
|
2900
|
45
|
74
|
4.5
|
555
|
|
125GDL100-20
|
6
|
108
|
120
|
2900
|
55
|
74
|
4.5
|
640
|
|
125GDL100-20
|
7
|
108
|
140
|
2900
|
75
|
74
|
4.5
|
840
|
|
125GDL100-20
|
8
|
108
|
160
|
2900
|
75
|
74
|
4.5
|
855
|
|
125GDL100-20
|
9
|
108
|
180
|
2900
|
90
|
74
|
4.5
|
870
|
|
125GDL100-20
|
10
|
108
|
200
|
2900
|
90
|
74
|
4.5
|
955
|
|
Model
|
Stages
|
Flow
|
Head
|
Speed
|
Motor Power
|
Efficiency
|
Required NPSH
|
Weight
|
|
m3/h
|
M
|
r/min
|
kw
|
%
|
NPSH
|
KG
|
||
|
150GDL160-20
|
2
|
160
|
40
|
2900
|
30
|
78
|
4.5
|
422
|
|
150GDL160-20
|
3
|
160
|
60
|
2900
|
37
|
78
|
4.5
|
452
|
|
150GDL160-20
|
4
|
160
|
80
|
2900
|
55
|
78
|
4.5
|
613
|
|
150GDL160-20
|
5
|
160
|
100
|
2900
|
75
|
78
|
4.5
|
820
|
|
150GDL160-20
|
6
|
160
|
120
|
2900
|
75
|
78
|
4.5
|
836
|
|
150GDL160-20
|
7
|
160
|
140
|
2900
|
90
|
78
|
4.5
|
922
|
Installation Dimensions
Performance Data |
|||||||
| Model |
H1
|
L
|
B
|
4-φd1
|
Inlet Flange (J)
|
||
|
DN
|
N-φD2
|
φD
|
|||||
|
25GDL
|
60
|
300
|
200
|
4-φ18
|
25
|
4-φ14
|
85
|
|
40GDL
|
80
|
360
|
235
|
4-φ18
|
40
|
4-φ18
|
110
|
|
50GDL
|
100
|
360
|
235
|
4-φ18
|
50
|
4-φ18
|
125
|
|
65GDL
|
110
|
360
|
235
|
4-φ18
|
65
|
4-φ18
|
145
|
|
80GDL
|
130
|
420
|
300
|
4-φ18
|
80
|
8-φ18
|
160
|
|
100GDL
|
160
|
520
|
350
|
4-φ18
|
100
|
8-φ18
|
180
|
|
125GDL
|
160
|
500
|
400
|
4-φ18
|
125
|
8-φ18
|
210
|
|
150GDL
|
180
|
600
|
400
|
4-φ18
|
150
|
8-φ22
|
245
|
OEM & Custom
Chaodun Pump provides OEM and ODM customization for GDL vertical multistage centrifugal pumps. Available materials include cast iron, stainless steel, or duplex alloy. Custom options include flange type, impeller size, voltage, and export packaging. Suitable for distributors and system integrators worldwide.
FAQs
1. What applications are suitable for GDL pumps?
Mainly for high-rise building water supply, fire protection, HVAC, and industrial water circulation.
2. Can this pump handle hot water?
Yes, up to 120°C under standard configuration.
3. Are OEM or branding services available?
Yes, Chaodun Pump provides OEM labeling, packaging, and custom color.
4. What’s the standard warranty?
12 months from shipment; extended warranty available.
5. What is the maximum pressure?
System pressure ≤ 2.0 MPa.