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CaseThe company is eager to collaborate with users, foster friendships, and jointly advance our shared cause. Guided by technological innovation, we strive to ensure that our product quality consistently meets and exceeds customers’ ever-increasing demands. By leveraging advanced technologies, we aim to drive rapid enterprise growth and make an even greater contribution to the development of China’s pump industry.
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ContactsThe company is eager to collaborate with users, foster friendships, and jointly advance our shared cause. Guided by technological innovation, we strive to ensure that our product quality consistently meets and exceeds customers’ ever-increasing demands. By leveraging advanced technologies, we aim to drive rapid enterprise growth and make an even greater contribution to the development of China’s pump industry.
QDG-type medium-pressure feedwater pump
Operating temperature (T): 104–200℃
Head (H): 105–2465 mH₂O
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- Product Description
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Overview:
To adapt to equipment upgrades focused on enhancing reliability and energy efficiency, our company has comprehensively introduced advanced technologies from both domestic and international sources, combined with practical production experience and our own patented technologies. Specifically targeting real-world applications such as bearing life and shaft-end sealing, we have developed and launched the QDG series of medium- and high-pressure boiler feedwater pumps.
Feedwater pumps are widely used in boiler feedwater systems for coal-fired power generation, combined heat and power (CHP) projects, gas-fired power generation, biomass power generation, as well as in high- and medium-pressure feedwater applications in industries such as steel, aluminum, magnesium, and mining.
The feedwater pump has the following advantages:
Employs a high-efficiency, energy-saving hydraulic model with high efficiency and excellent cavitation resistance.
• Low vibration, low noise, reliable operation, and easy maintenance.
The pump’s bearings and shaft-end seals have been effectively improved to extend their service life.
The components have a high degree of standardization and are fully interchangeable.
Performance range:
Flow rate Q = 1.5–700 m³/h
Head H = 105–2465 mH₂O
Temperature T = 104–200℃
Example of model meaning:
QDG(P)500-1700
Q—Corporate Identity
DG—Multistage Feed Pump
(P)—indicates that the pump has a horizontal suction design. If this marking is absent, the pump features vertical upward suction and vertical upward discharge.
500—Rated flow is 500 m³/h; 1700—Rated head is 1700 m.
Structural features:
The pump features a single-casing, radially split, multi-stage sectional design with both-end supported construction, and is engineered to operate under high temperature and high pressure conditions. The suction section, middle section, and discharge section are integrally connected by through-bolts. The static mating surfaces between these sections rely primarily on metal-to-metal sealing, supplemented by O-rings as auxiliary seals.
The pump’s suction flange and discharge flange can be arranged according to the user’s requirements. Generally, there are two main types: one features vertical suction and vertical discharge, suitable for boiler feedwater in the power industry; the other features horizontal suction and vertical discharge, ideal for pumping mine water from underground mines or for other engineering applications.
The pump rotor is a rigid rotor composed of components such as an impeller, shaft sleeve, and balance disc mounted on the shaft. The pump shaft has a large diameter, which fully ensures stable and reliable pump operation.
Shaft end seal
The seal housings on both the drive side and the non-drive side of the pump are cast with water-cooling chambers, allowing external cooling water to be connected for cooling when conveying high-temperature media.
The shaft end seal can be selected as either a packing seal or a mechanical seal, depending on the engineering requirements.
When packing seals are used, the packing gland and packing chamber are cooled with cooling water.
When a mechanical seal is used, the mechanical seal gland is equipped with cooling water flushing ports. At the shaft sealing area, replaceable shaft sleeves are installed to protect the pump shaft. Depending on the site operating conditions, two flushing methods are available for the mechanical seal: a closed-loop self-circulating mechanical seal (patented technology) and an externally flushed mechanical seal.
Bearing
Based on the pump’s performance parameters and structural requirements, four types of bearings were selected for the design:
1. Use radial ball bearings or roller bearings;
2. Sliding bearings;
3. Sliding bearings equipped with two sets of thrust ball bearings installed back-to-back;
4. Sliding bearings equipped with thrust sliding bearings, featuring forced lubrication by pressurized oil (patented technology), and equipped with an auxiliary lubrication system.
Coupling
Select the coupling specification and type based on the shaft seal structure and the pump’s shaft power.
1. Elastic pin coupling;
2. Elastomeric diaphragm-type extended coupling;
3. Toothed coupling.
Drive motor
Depending on the operational requirements, an electric motor or a steam turbine can be optionally selected for drive. When speed regulation of the feedwater pump is required, a variable-frequency motor or a speed-regulating coupling can be used.
Product Inquiry
Modern pump manufacturing enterprise
The company is eager to collaborate with users, foster friendships, and jointly advance our shared cause. Guided by technological innovation, we strive to ensure that our product quality consistently meets and exceeds customers’ ever-increasing demands. By leveraging advanced technologies, we aim to drive rapid enterprise growth and make an even greater contribution to the development of China’s pump industry.
Contact Us
Phone:+86-24-25350039
Phone:+86-24-25350035
Phone:+86-24-25350049
Email:qypump@qypump.com
Address: No. 328, Dongpinghu Street, Yuhong District, Shenyang City