-
Product
-
-
Service Policy
-
-
Blog
-
Join Us
Having 26 series -312 varieties - over 1000 pump models
Focused on water pump research and development manufacturing for 36 years
Free training for operation and maintenance personnel/free installation guidance/free provision of installation drawings
DGP-type self-balancing boiler feedwater pump with cooling device
Flow rate: 3.7–1350 m³/h
Head: 73–1800 m
Power: 5.5–4500 kW
Efficiency: 32%-84%
Pump weight: 158–6256 kg
Cavitation margin: 2.0–7.0 m
Price: 15,200–328,000
The DGP-type self-balancing high-temperature boiler feed pump is designed to convey clean water or liquids with physical and chemical properties similar to clean water, at temperatures ranging from 20°C to 210°C, and free of solid particles. It is suitable for feedwater applications in medium-, low-, and high-pressure boilers in power plants, steel mills, and other industrial facilities.
Hotline:
Self-balancing multistage pump
Horizontal Single-Stage Fire Pump
Product Overview
The DGP-type self-balancing high-temperature boiler feedwater pump features a rotor assembly with symmetric impellers arranged in stages. It eliminates the conventional balance disc mechanism found in traditional high-temperature boiler feedwater pumps. During operation, the axial forces generated are mutually balanced and essentially self-balanced, ensuring that the alignment between the impellers and guide vanes remains consistently stable. This design significantly improves the overall operational efficiency of the pump. The DGP pump represents an innovative structural design for high-temperature boiler feedwater pumps and serves as a viable alternative to multi-stage pumps equipped with balance discs or balance drums. Moreover, self-balancing technology is poised to become the future trend in the field of multi-stage centrifugal pumps.
↑Animation demonstration of the DGP-type self-balancing high-temperature boiler feedwater pump↑
The DGP-type high-efficiency self-balancing multistage pump is designed to meet user needs and accelerate the development of high-pressure multistage pump technology. It incorporates advanced technologies from similar foreign products, combined with our company’s many years of design experience. Developed in accordance with API610 standards, this high-efficiency, high-pressure multistage centrifugal pump boasts a technologically advanced position within the industry. It features advantages such as high efficiency and energy savings, a wide performance range, excellent cavitation resistance, safe and stable operation, low noise levels, fewer wear parts, and convenient installation and maintenance.
The DGP-type high-efficiency self-balancing multistage pump innovates upon the structural design of traditional multistage sectional centrifugal pumps by eliminating the outdated features. Multistage centrifugal pump The axial force balancing mechanism employs a balance disc or balance drum structure. Self-balancing multistage pump Due to the absence of a balancing device—specifically, the lack of both disc friction losses from unbalanced discs and balancing reflux losses—the pump efficiency is significantly higher than that of comparable older multistage pumps. At the same time, this design eliminates various failures caused by the failure of balancing devices, such as wear on the balance disc and balance disc seat, or rotor seizure, thereby greatly extending the pump’s service life. The trouble-free operating time is several times longer than that of conventional pumps, substantially reducing users’ maintenance costs and, consequently, lowering the overall lifecycle maintenance expenses for the pump. Years of operational experience have demonstrated that this product’s performance has reached the advanced level of similar international products.
The DGP high-efficiency self-balancing multistage pump is designed for conveying liquids containing solid particles with a maximum content of 2% (particle size less than 1 mm) and a solid concentration in the medium of less than 5% by weight. It is suitable for clean water or other liquids whose physicochemical properties are similar to those of clean water, with temperatures not exceeding 105℃. By modifying the pump material (or the material of the pump’s wetted parts), changing the sealing configuration, and adding a cooling system, this pump can also be used to convey hot water, oils, corrosive media, or media containing abrasive particles at temperatures up to 210℃.
Pump materials available for customer selection include HT200, QT600, 304, 304L, 316L, 317L, 904L, and CD4.
Meaning of Model Designation and Implementation Standards for DGP High-Temperature Self-Balancing Boiler Feed Pumps
Model meaning:
Implementation standard
GB/T5657-95 "Technical Specifications for Centrifugal Pumps (Class III)"
JB/T1051-93 "Model and Basic Parameters of Multistage Clear Water Centrifugal Pumps"
GB/T3216-2005 "Hydraulic Performance Acceptance Tests for Rotary Power Pumps—Class 1 and Class 2"
MT/T114-2005 "Multistage Centrifugal Pumps for Coal Mines"
Main applications of the DGP-type high-temperature self-balancing boiler feedwater pump
● Boiler feedwater systems and condensate return systems in industrial equipment
● Transportation of media in petrochemical, coal chemical, and chemical industries
● Cold water delivery in shearing equipment
● Pressurized water delivery in oxidation removal equipment
● High-pressure water production in industrial processes
● Chemical process flow
● Oilfield water injection, mine drainage
● Brine collection and transportation
● Water delivery for equipment such as compressors and shelling machines
Model Types of Self-Balancing Multistage Pumps
1. DP-type horizontal self-balancing multistage clear water centrifugal pump
It is used for conveying clear water or liquids with physicochemical properties similar to clear water, provided that the liquid contains no solid particles and has a temperature below 80℃. It is suitable for water supply and drainage projects in mines, factories, and urban areas.
2. DGP-type horizontal self-balancing multistage Boiler feedwater pump
It is used for conveying clean water or liquids with physicochemical properties similar to clean water, which contain no solid particles and have temperatures ranging from 20°C to 210°C. It is suitable for medium-, low-, and high-pressure water systems.
3. DFP Horizontal Self-Balancing Multi-Stage Corrosion-Resistant Centrifugal Pump
This pump is designed for conveying corrosive liquids that contain no solid particles and have temperatures ranging from 20°C to 105°C. Users can reasonably select the pump material, sealing type, pump structure, and determine the motor power based on factors such as the name of the conveyed medium, its concentration, specific gravity, operating temperature, and the pump’s inlet pressure.
4. DYP Horizontal Self-Balancing Multistage Centrifugal Oil Pump
For conveying oils and petroleum products that contain no solid particles, have a temperature ranging from 20℃ to 210℃, and a viscosity of less than 120 centistokes.
5. MDP-type horizontal wear-resistant multistage centrifugal pump for mining applications
For conveying mine drainage and other similar wastewater with a particle content of ≤1.5%, particle size of ≤1.3 mm, and temperatures ranging from 20℃ to 80℃.
DGP High-Temperature Self-Balancing Boiler Feed Pump vs. Traditional Boiler Feed Pump
As shown in the comparison above, the main advantages of the self-balancing multistage system over the traditional multistage system are:
1. Highly efficient and energy-saving, with significant power-saving effects.
Due to the reduced shaft power, the pump's power consumption per unit time decreases, resulting in a significant reduction in operating costs.
2. Advanced structure with a long maintenance-free period.
Due to the absence of balancing devices, the hydraulic system has fewer vulnerable parts, boasts long trouble-free operating hours, and significantly reduces maintenance and repair costs.
Working Principle of the DGP High-Temperature Self-Balancing Boiler Feed Pump
Driven by the motor, the pump shaft rotates and does work on the liquid, increasing its energy. The liquid is continuously conveyed vertically—from the suction sump through the pump’s inlet section, forward impeller, forward guide vanes, middle section, discharge nozzle, transition pipe, secondary inlet section, reverse impeller, reverse guide vanes, and finally to the discharge section.
Structural Diagram of the DGP High-Temperature Self-Balancing Boiler Feed Pump
The pump is a horizontal, sectional, multistage, self-balancing centrifugal pump with either single-suction or double-suction inlet. The pump’s suction and discharge ports are arranged horizontally, with the discharge outlet oriented vertically upward.
● The pump primarily consists of a suction section, a middle section, a discharge section, a secondary suction section, forward guide vanes, reverse impellers, a shaft, a throttling and pressure-reducing device, a sleeve, a bearing housing, a transition pipe, and other components connected by zero-strength through-bolts. The suction section, middle section, and discharge section of the pump feature hard metal seals lubricated with molybdenum disulfide grease. The rotor comprises parts such as forward and reverse impellers mounted on the shaft, a shaft sleeve, and bearing sleeves. The bearings are designed as follows: the fixed-end bearing is a cylindrical roller bearing, while the end-bearing is an angular-contact ball bearing. The middle section, discharge section, secondary suction section, forward guide vanes, reverse guide vanes, and transition pipe are also included.
● When the wear level of sealing rings, guide vane sleeves, and other sealing components installed between the rotor and stationary parts has begun to affect the pump’s operational performance, they should be replaced promptly.
● There are two types of shaft seals: mechanical seals and packing seals. For pumps equipped with packing seals, proper installation is crucial. The tightness of the packing must be just right—allowing liquid to drip slightly while ensuring the sealing elements remain securely seated within the seal chamber. A certain pressure of water must be introduced into the chamber to serve as a sealing medium. At the shaft seal area, there is a replaceable shaft sleeve installed to protect the pump shaft, enabling easy replacement of bearings and seals even when the pump is in operation.
● This series of pumps is directly driven by the prime mover via an elastic pin coupling or a diaphragm coupling, and the pump rotates clockwise.
● The standard motor configuration is the Y2 series motor; in environments with flammable and explosive gases, a specialized motor should be used.
Product Parameters
Performance Parameters of DGP-Type High-Temperature Self-Balancing Boiler Feed Pump
| Model Series |
Flow range (m³/h) |
Head range (m) |
Efficiency range (%) |
Matching power range (kw) |
| DGP6-25 | 3.75–7.5 | 70.35–320.3 | 36~49.5 | 5.5 to 18.5 |
| DGP6-50 | 3.75–7.5 | 144~624 | 28~30 | 15~55 |
| DGP6-80 | 3.75–7.5 | 225~982 | 32~36 | 15~75 |
| DGP12-25 | 7.5–15 | 68.3–325.3 | 43.3–52.1 | 7.5–30 |
| DGP12-50 | 7.5–15 | 142.7~635 | 30.6–44.6 | 18.5~75 |
| DGP12-80 | 7.5–15 | 225~982 | 37~40 | 30~132 |
| DGP25-30 | 15~30 | 77.7~418.8 | 55.2–56.9 | 15~55 |
| DGP25-50 | 15~30 | 144~618 | 44~54 | 22~110 |
| DGP25-80 | 15~30 | 228~1013 | 47~56 | 37~160 |
| DGP46-30 | 30~55 | 76.2~429 | 60~66.8 | 22~90 |
| DGP46-50 | 30~55 | 138.3–658.8 | 53.6–64.5 | 37~160 |
| DGP46-80 | 30~55 | 228~1056 | 59–65 | 55~250 |
| DGP65-80 | 50~75 | 228~1056 | 60–67 | 75~315 |
| DGP85-45 | 55~100 | 121.8~612 | 64.2–70.4 | 55~200 |
| DGP85-67 | 55~100 | 186.9~888 | 56.1–68.4 | 90~315 |
| DGP85-80 | 55~100 | 228~1056 | 59~71 | 110~450 |
| DGP85-150 | 55~100 | 429~1872 | 53~60 | 220~900 |
| DGP100-55 | 85~120 | 147~708 | 64.4–68 | 90~315 |
| DGP120-50 | 96~140 | 126.9~654 | 72~78 | 90~280 |
| DGP120-67 | 96~140 | 183–840 | 62–71 | 110~450 |
| DGP120-80 | 96~140 | 216~1056 | 61.6–70.4 | 132~560 |
| DGP120-100 | 96~140 | 261.6–1320 | 69.5~73 | 220~900 |
| DGP150-50 | 120~180 | 127.5–660 | 72~75 | 110~400 |
| DGP150-80 | 120~180 | 228~1056 | 65~75 | 185~710 |
| DGP150-100 | 120~180 | 261.6–1320 | 69.5~73 | 220~900 |
| DGP150-130 | 120~180 | 354~1644 | 62.5~64 | 315~1250 |
| DGP155-30 | 100~185 | 81.6–400.8 | 65.5–73.2 | 75~250 |
| DGP155-67 | 100~185 | 179.4–895.2 | 63–74 | 132~560 |
| DGP200-50 | 132~240 | 135~696 | 78–81 | 132~500 |
| DGP200-80 | 132~240 | 216~1044 | 70.9~75 | 220~900 |
| DGP200-100 | 132~240 | 252~1356 | 70~76 | 250~1000 |
| DGP280-43 | 185~335 | 116.1~564 | 70.5–76.7 | 160~630 |
| DGP280-65 | 185~335 | 184.5~816 | 63.3–74 | 250~1000 |
| DGP280-95 | 185~335 | 273~1200 | 68~72.5 | 400~1600 |
| DGP280-100 | 185~335 | 279~1248 | 58.6–72.6 | 400~1600 |
| DGP300-65 | 240~350 | 180~828 | 69.2–69.5 | 315~1120 |
| DGP360-40 | 300~440 | 106.5~504 | 77~80 | 185~710 |
| DGP360-60 | 300~440 | 157.5–768 | 71~74.5 | 355~1250 |
| DGP360-95 | 300~440 | 267~1224 | 70~73 | 500~2000 |
| DGP420-95 | 350~500 | 263~1192 | 67.9–71 | 560~2240 |
| DGP450-40 | 330~500 | 112.5~528 | 73.9–76.9 | 220~1000 |
| DGP450-60 | 335~500 | 162.9–765.6 | 74.1–78.9 | 355~1400 |
| DGP450-95 | 335~500 | 267~1200 | 72~75 | 560~2240 |
| DGP500-57 | 375~555 | 109.6–717.6 | 69.7–82.6 | 220~1400 |
| DGP550-40 | 400~600 | 76~528 | 75.1–78.4 | 185~1120 |
| DGP550-50 | 400~600 | 95~660 | 75.1–77.8 | 220~1400 |
| DGP550-95 | 400~600 | 182~1230 | 70.9–72.4 | 450~2800 |
| DGP580-60 | 450~640 | 113~780 | 75.5–76.8 | 280~1800 |
| DGP580-100 | 450~640 | 190–1284 | 70–74 | 500~2800 |
| DGP600-60 | 450~710 | 104~780 | 79–82 | 280~1800 |
| DGP600-85 | 450~710 | 162~1092 | 72.4–73.6 | 450~2800 |
| DGP650-80 | 540~715 | 154~1005 | 73.5–75.5 | 450~2800 |
| DGP650-100 | 540~715 | 193~1256 | 79.2–83 | 500~2800 |
| DGP720-60 | 550~850 | 106.8~738.1 | 79.2–82.4 | 355~2240 |
| DGP720-80 | 550~850 | 149~931.8 | 72.9~76 | 630~2800 |
| DGP720-100 | 550~850 | 186~1059 | 76.5–84 | 560~2800 |
| DGP800-80 | 620~900 | 150~951.5 | 73~81 | 500~2800 |
| DGP850-100 | 705~935 | 289~942 | 80~85 | 900~2800 |
| DGP900-60 | 700~1000 | 168~786 | 76.2~78 | 710~2800 |
Friendly reminder: Click on the specific model series above to view more detailed specifications and performance curves, among other information.
Why choose us?
Changsha Zhonghlian Pump Industry Co., Ltd. was founded in 1989 and was independently established after the restructuring of Changsha Water Pump Factory. It is a comprehensive national high-tech enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Equity Exchange on December 31, 2019, with the abbreviation "Zhonghlian Pump Industry" and the equity code: 600275HN. It is currently a key backbone enterprise in China's centrifugal pump industry and one of the major professional manufacturers of multi-stage pumps in the country. The headquarters is located in Changsha City, Hunan Province, a historical and cultural city in China.
Square meters of land area
100% factory pass rate
Square meters of land area
100% factory pass rate
Q
What is your typical delivery time?
A
Models in stock can be shipped the next day at the latest. All others are custom-made, with lead times generally ranging from 7 to 90 days depending on the product size and project specifics. Please contact our sales manager for details: 0731-88632200 。
Q
Do you have centrifugal pumps in stock?
A
Centrifugal pumps come in numerous models and configurations. Except for a small number of high-volume, standard models that are in stock, the vast majority are not stocked and are customized products. We need to select a pump based on your site's flow rate, head, media temperature, pH value, and installation conditions, etc., to determine the pump model and configuration before we can submit an order to the factory for production.
Q
What information should I provide when requesting a quote?
A
Generally, to obtain an accurate quotation, we recommend providing us with the following information: pump flow rate, head, on-site operating voltage and frequency, temperature, pH value, and solid particle content of the fluid being conveyed, and on-site installation conditions (horizontal or vertical installation), etc.
If you are not sure, don't worry, our business managers will assist you in determining this.
Q
What products do you mainly produce?
A
Zhonglian Pump Industry manufactures various large industrial centrifugal pumps. Main products include: self-balancing multi-stage pumps, multi-stage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condensate pumps, etc.
Q
Why is it so slow to get a price quote?
A
Because centrifugal pumps are non-standard customized products with many models, the price range is also very large. Even for the same model, the price difference is also very large due to different materials and configurations. Taking the most common water pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clarify the relevant information to give you an accurate price. Normally, if you provide relatively comprehensive information, we can quote within 5 minutes.
Previous Page
Next Page
Previous Page
Next Page
Product message
Contact our team promptly; we are happy to help you.
*Note: Please fill in the information accurately and keep the communication open. We will contact you as soon as possible.
Hotline:
+86 0731-88632200
Export Trade/Technical Support:
+86 153-4831-2290
Head Office Email:
zoomlian@yeah.net
No. 210, Huanbao Zhong Road, Yuhua District, Changsha City, Hunan Province, Leowoju Wisdom Valley Building B, 8th Floor
Quick Navigation
Hot Products
Online Consultation
Powered by:www.300.cn Changsha SEO