- Product Description
-
Overview
Type D pumps are designed to handle clean water or liquids with similar physical and chemical properties, free of solid particles and at temperatures below 80°C. They are ideal for applications in mining, industrial settings, and urban water supply and drainage systems.
The DG-type pump is a multi-stage, sectional boiler feedwater pump designed for delivering clean water free of solid particles (such as abrasives) or other liquids with physicochemical properties similar to water. It is ideally suited for supplying feedwater to medium- and low-pressure boilers and can also be used as a general-purpose multi-stage centrifugal clear-water pump. The temperature of the liquid being pumped ranges from -20°C to 15°C.
Structure Description
This pump type primarily consists of a casing section, a rotor section, a balancing mechanism, a bearing section, and seals.
1. Casing Section
The casing assembly primarily consists of the suction section, middle section, discharge section, guide vanes, bearing housing, and more, with all components connected by bolts. When viewed from the drive end, the pump rotates clockwise.
2. Rotor section
The rotor assembly primarily consists of a shaft, along with components mounted on the shaft such as an impeller, sleeve, and balance disc. The components on the shaft are secured in place using a keyway and a sleeve nut, while the entire rotor is supported by bearings at both ends within the pump casing. The number of rotor blades is determined based on the pump's stage configuration.
When using this type of pump, it is essential to connect the shaft seal with a water seal. The water seal can be implemented in two ways: one utilizes the discharge liquid from the primary impeller, while the other involves introducing external water. In Table 2, any item marked as requiring a "water seal connection" refers specifically to the external water seal; for all other items not explicitly noted, the discharge liquid from the primary impeller is used as the water seal connection. The tightness of the shaft seal packing should be adjusted appropriately—enough to allow a slight drip of water to escape. If the temperature of the conveyed medium exceeds 80°C, it is mandatory to use water for cooling both the stuffing box and the shaft seal cooling chamber. Both the cooling water and the externally supplied water for the water seal must be clean, fresh water at ambient temperature. The cooling water pressure should be maintained between 1.5 and 3 kg/cm², while the water seal pressure must remain 0.5 to 1 kg/cm² higher than the pressure inside the sealing chamber. Please note that the water seal and shaft seal cooling chamber’s water pipe connections vary depending on the specific pump model. For detailed information on the axial positioning of these connections, refer to the pump’s structural diagram.3. Balancing Mechanism
The balancing mechanism consists of a balance ring, balance sleeve, balance disc, and balance pipe.
4. Bearing Section
The bearing assembly primarily consists of the bearing housing and the bearings themselves. This type of pump features two kinds of bearings: sliding bearings and circulating bearings. Importantly, the bearings do not support axial forces. During operation, the rotor must be able to move freely along the axial direction within the pump casing; therefore, radial ball bearings cannot be used. For detailed information on the specific bearings used in each pump model, refer to Table 1.
5. On the pump's sealed cooling housing, apply molybdenum disulfide grease to seal the mating surfaces of the suction section, middle section, discharge section, and guide vanes. The rotor is sealed against the stationary parts using sealing rings, guide vanes, packing materials, and more. If wear on the sealing rings or guide vane sleeves begins to affect the pump’s operation and performance, they should be replaced promptly. When operating this type of pump, ensure that the packing ring is positioned correctly.Structure Diagram
1. Pump Coupling
2. Shaft
3. Rolling bearing components
4. Packing Gland
5. Inlet Section
6. Sealing Ring
7. Middle Section
8. Impeller
9. Guide Vanes
10. Guide Vane Bushing
11. Tighten the bolts
12. Ejection Section
13. Balance Sleeve (Ring)
14. Balance Disc
15. Stuffing Box
16. BearingsPerformance Parameter Table
Model
Rotational speed
Traffic
Head (m)
Efficiency
Shaft power
Motor power
Required NPSH
D, DG6-25×3
2950
6.3
1.75
75
45
2.86
5.5
2.0
D, DG6-25×4
2950
6.3
1.75
100
45
3.81
7.5
2.0
D, DG6-25×5
2950
6.3
1.75
125
45
4.77
7.5
2.0
D, DG6-25×6
2950
6.3
1.75
150
45
5.72
11
2.0
D, DG6-25×7
2950
6.3
1.75
175
45
6.67
11
2.0
D、DG6-25×8
2950
6.3
1.75
200
45
7.63
15
2.0
D, DG6-25×9
2950
6.3
1.75
225
45
8.52
15
2.0
D, DG6-25×10
2950
6.3
1.75
250
45
9.53
18.5
2.0
D, DG6-25×11
2950
6.3
1.75
275
45
10.5
18.5
2.0
D, DG6-25×12
2950
6.3
1.75
300
45
11.44
18.5
2.0
D, DG12-25×3
2950
12.5
3.47
75
54
4.73
7.5
2.0
D, DG12-25×4
2950
12.5
3.47
100
54
6.30
11
2.0
D, DG12-25×5
2950
12.5
3.47
125
54
7.88
11
2.0
D. DG12-25×6
2950
12.5
3.47
150
54
9.46
15
2.0
D, DG12-25×7
2950
12.5
3.47
175
54
11.0
15
2.0
D. DG12-25×8
2950
12.5
3.47
200
54
12.51
18.5
2.0
D, DG12-25×9
2950
12.5
3.47
225
54
14.18
18.5
2.0
D, DG12-25×10
2950
12.5
3.47
250
54
15.76
22
2.0
D, DG12-25×11
2950
12.5
3.47
275
54
17.34
22
2.0
D. DG12-25×12
2950
12.5
3.47
300
54
18.9
30
2.0
D、DG25-30×3
2950
25
6.94
90
62
9.88
15
2.2
D. DG25-30×4
2950
25
6.94
120
62
13.1
18.5
2.2
D. DG25-30×5
2950
25
6.94
150
62
16.47
22
2.2
D. DG25-30×6
2950
25
6.94
180
62
19.77
30
2.2
D. DG25-30×7
2950
25
6.94
210
62
23.1
30
2.2
D. DG25-30×8
2950
25
6.94
240
62
26.4
37
2.2
D、DG25-30×9
2950
25
6.94
270
62
29.65
37
2.2
D. DG25-30×10
2950
25
6.94
300
62
32.9
45
2.2
D, DG46-30×3
2950
46
12.8
90
70
16.11
22
3.0
D, DG46-30×4
2950
46
12.8
120
70
21.48
30
3.0
D, DG46-30×5
2950
46
12.8
150
70
26.85
37
3.0
D, DG46-30×6
2950
46
12.8
180
70
32.21
37
3.0
D, DG46-30×7
2950
46
12.8
210
70
37.58
45
3.0
D, DG46-30×8
2950
46
12.8
240
70
42.95
55
3.0
D, DG46-30×9
2950
46
12.8
270
70
48.32
55
3.0
D, DG46-30×10
2950
46
12.8
300
70
53.69
75
3.0
D, DG46-50×3
2950
46
12.8
150
63
29.83
37
2.8
D, DG46-50×4
2950
46
12.8
200
63
39.77
45
2.8
Model
Rotational speed
Traffic
Head (m)
Required shaft power
Motor power
Required NPSH D, DG46-50×5
2950
46
12.8
250
63
49.71
55
2.8
D. DG46-50×6
2950
46
12.8
300
63
59.65
75
2.8
D, DG46-50×7
2950
46
12.8
350
63
69.6
90
2.8
D, DG46-50×8
2950
46
12.8
400
63
79.54
90
2.8
D, DG46-50×9
2950
46
12.8
450
63
89.48
110
2.8
D. DG46-50×10
2950
46
12.8
500
63
99.42
110
2.8
D. DG46-50×11
2950
46
12.8
550
63
109.36
132
2.8
D, DG46-50×12
2950
46
12.8
600
63
119.3
132
2.8
DG85-45×2
2950
85
23.6
90
72
28.94
37
4.2
DG85-45×3
2950
85
23.6
135
72
43.4
55
4.2
DG85-45×4
2950
85
23.6
180
72
57.87
75
4.2
DG85-45×5
2950
85
23.6
225
72
72.34
90
4.2
DG85-45×6
2950
85
23.6
270
72
86.81
110
4.2
DG85-45×7
2950
85
23.6
315
72
101.3
132
4.2
DG85-45×8
2950
85
23.6
360
72
115.7
132
4.2
DG85-45×9
2950
85
23.6
405
72
130.2
160
4.2
DG155-30×2
2950
155
43
60
77
32.84
55
3.2
DG155-30×3
2950
155
43
60
77
49.26
75
3.2
DG155-30×4
2950
155
43
120
77
65.68
90
3.2
DG155-30×5
2950
155
43
150
77
82.10
110
3.2
DG155-30×6
2950
155
43
180
77
98.52
132
3.2
DG155-30×7
2950
155
43
210
77
114.97
160
3.2
DG155-30×8
2950
155
43
240
77
131.36
180
3.2
DG155-30×9
2950
155
43
270
77
147.78
180
3.2
DG155-30×10
2950
155
43
300
77
164.20
225
3.2
D, DG155-67×3
2950
155
43
201
74
114.7
132
5.0
D, DG155-67×4
2950
155
43
268
74
152.6
185
5.0
D, DG155-67×5
2950
155
43
335
74
191.1
220
5.0
D, DG155-67×6
2950
155
43
402
74
229.3
280
5.0
D. DG155-67×7
2950
155
43
469
74
267.5
350
5.0
D. DG155-67×8
2950
155
43
536
74
305.7
350
5.0
D, DG155-67×9
2950
155
43
603
74
344
440
5.0
DG280-43×2
1480
280
77.8
86
77
85.17
110
4.0
DG280-43×3
1480
280
77.8
129
77
127.7
150
4.0
DG280-43×4
1480
280
77.8
172
77
170.3
230
4.0
DG280-43×5
1480
280
77.8
215
77
212.9
300
4.0
DG280-43×6
1480
280
77.8
258
77
255.5
300
4.0
DG280-43×7
1480
280
77.8
301
77
298.1
350
4.0
DG280-43×8
1480
280
77.8
344
77
304.7
410
4.0
DG280-43×9
1480
280
77.8
387
77
383.2
430
4.0
DG280-65×6
1480
280
77.8
390
73
407.4
500
3.0
DG280-65×7
1480
280
77.8
455
73
475.3
680
3.0
DG280-65×8
1480
280
77.8
520
73
543.2
680
3.0
DG280-65×9
1480
280
77.8
585
73
611.1
850
3.0
DG280-65×10
1480
280
77.8
650
73
579
850
3.0
DG450-60×3
1480
450
125
180
79
229.2
360
4.2
DG450-60×4
1480
450
125
240
79
372.3
500
4.2
DG450-60×5
1480
450
125
300
79
465.4
680
4.2
DG450-60×6
1480
450
125
360
79
558.2
680
4.2
DG450-60×7
1480
450
125
420
79
651.5
850
4.2
DG450-60×8
1480
450
125
480
79
744.6
850
4.2
DG450-60×9
1480
450
125
540
79
837.7
1050
4.2
DG450-60×10
1480
450
125
600
79
930.8
1050
4.2
Our strengths
Quality Assurance
Order and ship quickly
Customization supported
Worry-free after-sales service
Factory real-shot footage
Our strengths
T/T, L/C
★ If your order isn’t very large, we can ship it to you via TNT, DHL, UPS, or EMS.
★ If your order is large, we recommend shipping it via air or sea freight through your designated forwarder. We also have long-term, trusted agents who can assist with this.
7–10 business days
Frequently Asked Questions
Does the company accept OEM/ODM orders?
The company accepts OEM/ODM orders and can customize product appearance, specifications, packaging, and more according to customer requirements.
Does the company provide samples?
The company can provide samples based on customer needs, with customers responsible for covering the sample costs and shipping fees.
How does the company calculate shipping costs?
Shipping costs are calculated based on factors such as cargo volume, weight, mode of transportation, and destination. Feel free to reach out for a detailed shipping quote.
How does the company ensure the safety of its goods?
The company uses professional packaging materials and reinforcement measures to ensure that goods arrive safely and undamaged during transportation.
How does the company arrange cargo transportation?
The company boasts a professional logistics team that can arrange sea, air, or land transportation based on customer needs, offering door-to-door services.
What payment methods does the company accept?
The company accepts a variety of payment methods, including [list the payment methods accepted by the company, such as T/T, L/C, D/P, etc.], making it convenient for customers to choose.
D. DG Series Multistage Pumps
Share now
- Product Description
-
Overview
Type D pumps are designed to handle clean water or liquids with similar physical and chemical properties, free of solid particles and at temperatures below 80°C. They are ideal for applications in mining, industrial settings, and urban water supply and drainage systems.
The DG-type pump is a multi-stage, sectional boiler feedwater pump designed for delivering clean water free of solid particles (such as abrasives) or other liquids with physicochemical properties similar to water. It is ideally suited for supplying feedwater to medium- and low-pressure boilers and can also be used as a general-purpose multi-stage centrifugal clear-water pump. The temperature of the liquid being pumped ranges from -20°C to 15°C.
Structure Description
This pump type primarily consists of a casing section, a rotor section, a balancing mechanism, a bearing section, and seals.
1. Casing Section
The casing assembly primarily consists of the suction section, middle section, discharge section, guide vanes, bearing housing, and more, with all components connected by bolts. When viewed from the drive end, the pump rotates clockwise.
2. Rotor section
The rotor assembly primarily consists of a shaft, along with components mounted on the shaft such as an impeller, sleeve, and balance disc. The components on the shaft are secured in place using a keyway and a sleeve nut, while the entire rotor is supported by bearings at both ends within the pump casing. The number of rotor blades is determined based on the pump's stage configuration.
When using this type of pump, it is essential to connect the shaft seal with a water seal. The water seal can be implemented in two ways: one utilizes the discharge liquid from the primary impeller, while the other involves introducing external water. In Table 2, any item marked as requiring a "water seal connection" refers specifically to the external water seal; for all other items not explicitly noted, the discharge liquid from the primary impeller is used as the water seal connection. The tightness of the shaft seal packing should be adjusted appropriately—enough to allow a slight drip of water to escape. If the temperature of the conveyed medium exceeds 80°C, it is mandatory to use water for cooling both the stuffing box and the shaft seal cooling chamber. Both the cooling water and the externally supplied water for the water seal must be clean, fresh water at ambient temperature. The cooling water pressure should be maintained between 1.5 and 3 kg/cm², while the water seal pressure must remain 0.5 to 1 kg/cm² higher than the pressure inside the sealing chamber. Please note that the water seal and shaft seal cooling chamber’s water pipe connections vary depending on the specific pump model. For detailed information on the axial positioning of these connections, refer to the pump’s structural diagram.3. Balancing Mechanism
The balancing mechanism consists of a balance ring, balance sleeve, balance disc, and balance pipe.
4. Bearing Section
The bearing assembly primarily consists of the bearing housing and the bearings themselves. This type of pump features two kinds of bearings: sliding bearings and circulating bearings. Importantly, the bearings do not support axial forces. During operation, the rotor must be able to move freely along the axial direction within the pump casing; therefore, radial ball bearings cannot be used. For detailed information on the specific bearings used in each pump model, refer to Table 1.
5. On the pump's sealed cooling housing, apply molybdenum disulfide grease to seal the mating surfaces of the suction section, middle section, discharge section, and guide vanes. The rotor is sealed against the stationary parts using sealing rings, guide vanes, packing materials, and more. If wear on the sealing rings or guide vane sleeves begins to affect the pump’s operation and performance, they should be replaced promptly. When operating this type of pump, ensure that the packing ring is positioned correctly.Structure Diagram
1. Pump Coupling
2. Shaft
3. Rolling bearing components
4. Packing Gland
5. Inlet Section
6. Sealing Ring
7. Middle Section
8. Impeller
9. Guide Vanes
10. Guide Vane Bushing
11. Tighten the bolts
12. Ejection Section
13. Balance Sleeve (Ring)
14. Balance Disc
15. Stuffing Box
16. BearingsPerformance Parameter Table
Model
Rotational speed
Traffic
Head (m)
Efficiency
Shaft power
Motor power
Required NPSH
D, DG6-25×3
2950
6.3
1.75
75
45
2.86
5.5
2.0
D, DG6-25×4
2950
6.3
1.75
100
45
3.81
7.5
2.0
D, DG6-25×5
2950
6.3
1.75
125
45
4.77
7.5
2.0
D, DG6-25×6
2950
6.3
1.75
150
45
5.72
11
2.0
D, DG6-25×7
2950
6.3
1.75
175
45
6.67
11
2.0
D、DG6-25×8
2950
6.3
1.75
200
45
7.63
15
2.0
D, DG6-25×9
2950
6.3
1.75
225
45
8.52
15
2.0
D, DG6-25×10
2950
6.3
1.75
250
45
9.53
18.5
2.0
D, DG6-25×11
2950
6.3
1.75
275
45
10.5
18.5
2.0
D, DG6-25×12
2950
6.3
1.75
300
45
11.44
18.5
2.0
D, DG12-25×3
2950
12.5
3.47
75
54
4.73
7.5
2.0
D, DG12-25×4
2950
12.5
3.47
100
54
6.30
11
2.0
D, DG12-25×5
2950
12.5
3.47
125
54
7.88
11
2.0
D. DG12-25×6
2950
12.5
3.47
150
54
9.46
15
2.0
D, DG12-25×7
2950
12.5
3.47
175
54
11.0
15
2.0
D. DG12-25×8
2950
12.5
3.47
200
54
12.51
18.5
2.0
D, DG12-25×9
2950
12.5
3.47
225
54
14.18
18.5
2.0
D, DG12-25×10
2950
12.5
3.47
250
54
15.76
22
2.0
D, DG12-25×11
2950
12.5
3.47
275
54
17.34
22
2.0
D. DG12-25×12
2950
12.5
3.47
300
54
18.9
30
2.0
D、DG25-30×3
2950
25
6.94
90
62
9.88
15
2.2
D. DG25-30×4
2950
25
6.94
120
62
13.1
18.5
2.2
D. DG25-30×5
2950
25
6.94
150
62
16.47
22
2.2
D. DG25-30×6
2950
25
6.94
180
62
19.77
30
2.2
D. DG25-30×7
2950
25
6.94
210
62
23.1
30
2.2
D. DG25-30×8
2950
25
6.94
240
62
26.4
37
2.2
D、DG25-30×9
2950
25
6.94
270
62
29.65
37
2.2
D. DG25-30×10
2950
25
6.94
300
62
32.9
45
2.2
D, DG46-30×3
2950
46
12.8
90
70
16.11
22
3.0
D, DG46-30×4
2950
46
12.8
120
70
21.48
30
3.0
D, DG46-30×5
2950
46
12.8
150
70
26.85
37
3.0
D, DG46-30×6
2950
46
12.8
180
70
32.21
37
3.0
D, DG46-30×7
2950
46
12.8
210
70
37.58
45
3.0
D, DG46-30×8
2950
46
12.8
240
70
42.95
55
3.0
D, DG46-30×9
2950
46
12.8
270
70
48.32
55
3.0
D, DG46-30×10
2950
46
12.8
300
70
53.69
75
3.0
D, DG46-50×3
2950
46
12.8
150
63
29.83
37
2.8
D, DG46-50×4
2950
46
12.8
200
63
39.77
45
2.8
Model
Rotational speed
Traffic
Head (m)
Required shaft power
Motor power
Required NPSH D, DG46-50×5
2950
46
12.8
250
63
49.71
55
2.8
D. DG46-50×6
2950
46
12.8
300
63
59.65
75
2.8
D, DG46-50×7
2950
46
12.8
350
63
69.6
90
2.8
D, DG46-50×8
2950
46
12.8
400
63
79.54
90
2.8
D, DG46-50×9
2950
46
12.8
450
63
89.48
110
2.8
D. DG46-50×10
2950
46
12.8
500
63
99.42
110
2.8
D. DG46-50×11
2950
46
12.8
550
63
109.36
132
2.8
D, DG46-50×12
2950
46
12.8
600
63
119.3
132
2.8
DG85-45×2
2950
85
23.6
90
72
28.94
37
4.2
DG85-45×3
2950
85
23.6
135
72
43.4
55
4.2
DG85-45×4
2950
85
23.6
180
72
57.87
75
4.2
DG85-45×5
2950
85
23.6
225
72
72.34
90
4.2
DG85-45×6
2950
85
23.6
270
72
86.81
110
4.2
DG85-45×7
2950
85
23.6
315
72
101.3
132
4.2
DG85-45×8
2950
85
23.6
360
72
115.7
132
4.2
DG85-45×9
2950
85
23.6
405
72
130.2
160
4.2
DG155-30×2
2950
155
43
60
77
32.84
55
3.2
DG155-30×3
2950
155
43
60
77
49.26
75
3.2
DG155-30×4
2950
155
43
120
77
65.68
90
3.2
DG155-30×5
2950
155
43
150
77
82.10
110
3.2
DG155-30×6
2950
155
43
180
77
98.52
132
3.2
DG155-30×7
2950
155
43
210
77
114.97
160
3.2
DG155-30×8
2950
155
43
240
77
131.36
180
3.2
DG155-30×9
2950
155
43
270
77
147.78
180
3.2
DG155-30×10
2950
155
43
300
77
164.20
225
3.2
D, DG155-67×3
2950
155
43
201
74
114.7
132
5.0
D, DG155-67×4
2950
155
43
268
74
152.6
185
5.0
D, DG155-67×5
2950
155
43
335
74
191.1
220
5.0
D, DG155-67×6
2950
155
43
402
74
229.3
280
5.0
D. DG155-67×7
2950
155
43
469
74
267.5
350
5.0
D. DG155-67×8
2950
155
43
536
74
305.7
350
5.0
D, DG155-67×9
2950
155
43
603
74
344
440
5.0
DG280-43×2
1480
280
77.8
86
77
85.17
110
4.0
DG280-43×3
1480
280
77.8
129
77
127.7
150
4.0
DG280-43×4
1480
280
77.8
172
77
170.3
230
4.0
DG280-43×5
1480
280
77.8
215
77
212.9
300
4.0
DG280-43×6
1480
280
77.8
258
77
255.5
300
4.0
DG280-43×7
1480
280
77.8
301
77
298.1
350
4.0
DG280-43×8
1480
280
77.8
344
77
304.7
410
4.0
DG280-43×9
1480
280
77.8
387
77
383.2
430
4.0
DG280-65×6
1480
280
77.8
390
73
407.4
500
3.0
DG280-65×7
1480
280
77.8
455
73
475.3
680
3.0
DG280-65×8
1480
280
77.8
520
73
543.2
680
3.0
DG280-65×9
1480
280
77.8
585
73
611.1
850
3.0
DG280-65×10
1480
280
77.8
650
73
579
850
3.0
DG450-60×3
1480
450
125
180
79
229.2
360
4.2
DG450-60×4
1480
450
125
240
79
372.3
500
4.2
DG450-60×5
1480
450
125
300
79
465.4
680
4.2
DG450-60×6
1480
450
125
360
79
558.2
680
4.2
DG450-60×7
1480
450
125
420
79
651.5
850
4.2
DG450-60×8
1480
450
125
480
79
744.6
850
4.2
DG450-60×9
1480
450
125
540
79
837.7
1050
4.2
DG450-60×10
1480
450
125
600
79
930.8
1050
4.2
Please provide your phone number and email address, and we’ll reach out to you promptly within one business day to address your concerns as soon as possible.
Contact us
Email: info@tiemapump.com
Phone: +86-15831102202
WhatsApp: +8615831102202
Address: Intersection of Tan Gu East Street and Huai Bei Road, Yuhua District, Shijiazhuang City