Do your water pump couplings always come with these “annoying issues”?

The feedwater pump is the “heart” of the boiler’s water supply in a power plant; if it malfunctions, minor issues can cause fluctuations in water level that affect unit load, while more severe failures may result in unplanned outages. However, in actual operation, the feedwater pump drive system often encounters numerous challenges:

“Water hammer” impact, with the pipe clanging loudly. — When the pump is stopped, the kinetic energy of the fluid is released instantaneously, causing severe pressure pulsations, intense pipeline vibrations, valve leakage, and damage to flange seals.

The water level fluctuates dramatically, and the safety valve trips repeatedly. — The feedwater pump’s speed‑regulation response is delayed, making boiler water‑level control difficult; the safety valve trips frequently and may even vent steam.

Bearings frequently burn out, and the thrust pads “can’t take it.” — During the start-up and shutdown of the high-pressure pump, significant abrupt changes in axial thrust occur, leading to frequent failures of the thrust bearings and thrust pads.

Oil temperature has risen abnormally, with persistent vibration and unusual noises. — Operating oil temperature exceeds the limit, the entire machine exhibits severe vibration and low-frequency humming, which becomes more pronounced as the rotational speed increases.

The dipper tube is stuck, and speed control has failed. — Oil sludge and metal filings jam the spool valve, causing jittery, stiff movement during speed regulation and asynchronous operation of the actuator.

Oil leaks keep recurring, and maintenance is never-ending. — Oil seals aging and sealing components damaged can cause oil leakage, reducing transmission performance; standard products require shutdown for maintenance every 6 to 12 months.

High energy consumption and a persistently high plant electricity rate. — The power consumption of feedwater pumps accounts for approximately 2.5% to 4% of the unit’s total electricity generation, leaving substantial room for energy savings.

ZTE Hydraulic Transmission – Dedicated to Solving Challenges in Power Transmission

Guangdong Zhongxing Hydraulic Transmission (Originally established in 1958 and formerly a joint venture with Germany’s Voith), the company is a key national high-tech enterprise under the Torch Program. It operates the Guangdong Provincial Hydraulic Transmission Engineering Technology Research and Development Center, holds 41 patents, and has obtained ISO 9001 quality management system certification. The “Guangxing” brand hydraulic couplings are widely used in power generation, metallurgy, mining, and other industries, covering… Over 370 specifications , exported to more than 30 countries and regions. The company is… Shaanxi Beiyuan Chemical Group Cogeneration Branch It is used as a hydraulic coupling for feedwater pumps at multiple power plants (model YOTFQZ-460), delivering stable and reliable operation.

We address each of your pain points one by one.

🔑 Key Considerations for Selecting a Feedwater Pump Coupling

As a core auxiliary unit in a power plant, the selection of an hydraulic coupling for the feedwater pump requires particular attention to the following:

Choose the right type — To achieve energy savings, the feedwater pump should operate at variable speed; therefore, it is advisable to select Variable-speed hydraulic coupling (such as the YOT, YOTC, SVTL series, etc.)

Accurately calculate power and rotational speed. — At an input speed of 1,000 r/min, the corresponding power is 40–80 kW; at 1,500 r/min, it is 120–270 kW. Precise matching is required.

Pay attention to the maintenance-free period. ——The standard YOX series requires maintenance every 6–12 months, while the upgraded DXA series can extend this interval to 2-3 years , significantly reducing operational and maintenance costs

Special handling for high-speed operating conditions — For boiler feedwater pumps with speeds exceeding 3,000 r/min, it is necessary to adopt Front-gear speed-increasing type Hydraulic Coupling Transmission Device

Applicable Scenarios

Electric feedwater pump for thermal power plant boilers

Cogeneration Unit Feedwater Pump System

Nuclear power plant main feedwater pump unit

Industrial Boiler Feedwater System

Why choose ZTE?

Specifically designed for feedwater pumps : The YOTFQZ, YOTC, SVTL, and other series are precisely matched to the variable-speed operating conditions of feedwater pumps, achieving energy savings of 20%–40%.

Full specifications : Limited-torque and variable-speed types, with over 370 models, covering the power range of all kinds of water supply pumps.

More reliable : 60 years of industry experience combined with German engineering expertise; our products are widely deployed across power utilities such as China Huaneng, China Huadian, and China Datang.

More worry-free : The upgraded DXA model features a maintenance-free interval of 2–3 years, significantly reducing downtime costs.

Good service : Operational condition diagnosis → Selection and sizing calculations → Installation guidance → After-sales maintenance—end-to-end technical support

Consult now

Guangdong Zhongxing Hydraulic Transmission Co., Ltd.

Address: No. 45, Hedi Road, Ducheng Town, Yun’an County, Yunfu City, Guangdong Province

Main products: torque-limiting and speed-regulating couplings, coolers, and conveyor protection devices.

Feel free to call us to discuss your operating conditions and receive a customized selection solution!

Ensure smoother water supply, more reliable operation, and greater energy savings for your water pump!