YYF Industrial Valves: Core Assurance for Safe and Efficient Nuclear Industry Operations

As the global energy structure undergoes profound transformation, the nuclear industry, as a pillar of efficient and clean energy, relies on the Excellent performance of critical equipment for its safe and stable operation. As a technological leader in nuclear-grade valves, YYF has consistently provided end-to-end fluid control solutions for global nuclear power enterprises, adhering to the strictest nuclear safety standards and innovative technologies. We serve as a reliable partner for core systems such as reactor cooling, steam regulation, and safety isolation.

I. The Core Mission of Nuclear-Grade Valves: Building Critical Barriers for Safety Control

Nuclear facilities operate under extreme conditions of high temperature (exceeding 500°C), high pressure (over 2,500 psi), strong radiation, and corrosive media. As the core components for fluid control, valves perform four key functions:

Precision Flow Regulation: In critical loops such as reactor coolant systems and steam generators, they enable fine-grained management of cooling media and steam flow, maximizing energy conversion efficiency.
Rapid Safety Isolation: In emergency situations (e.g., equipment maintenance or leakage warnings), zero-leakage sealing design instantly cuts off fluid pathways, creating a physical barrier against radioactive material diffusion.
Intelligent Pressure Management: Safety valves with high-precision sensors monitor system pressure in real time, releasing excess pressure within milliseconds when overpressure occurs to effectively prevent pipeline rupture and equipment damage.
Unidirectional Flow Protection: Check valves with optimized fluid dynamic designs eliminate backflow of coolants, protecting the purity of media and integrity of key loops in nuclear islands.

For procurement decision-makers in the nuclear industry, valve reliability is directly linked to production safety and environmental security. YYF nuclear-grade valves achieve a 99.99% failure-free operation rate through full-life-cycle reliability design, significantly reducing unplanned system downtime and becoming the strategic partner of global top-tier nuclear power enterprises.

II. Full Product Matrix: Tailored Solutions for Diverse System Requirements

Addressing the complex 工况 of nuclear power plants—including the nuclear island, conventional island, and auxiliary systems—YYF has developed six core product series, covering the entire process from main reactor loops to peripheral auxiliary pipelines:

1. Gate Valves – Sealing Benchmark for High-Pressure Systems

Application: Main reactor coolant pipelines, high-pressure feedwater loops
Technical Advantages: Constructed from duplex stainless steel (2205) and Inconel alloy composites, offering a 40% improvement in radiation-resistant embrittlement; wedge-shaped gate with elastic sealing surface achieves bubble-tight zero-leakage standard (leakage rate ≤ 1×10⁻⁹ mbar·L/s).
Value Proposition: Suited for low-frequency operation requiring absolute sealing, compliant with ASME BPVC Section III nuclear-grade material certification to eliminate radioactive media leakage risks from the material source.

2. Globe Valves – Precision Flow Control Experts

Application: Steam control valve groups, chemical volume control systems
Core Technology: Patented multi-stage pressure-reducing valve core structure reduces erosion from high-speed fluids by 60%; intelligent positioning electric actuators achieve ±0.5% stroke control accuracy, supporting remote precise regulation via DCS systems.
Engineering Value: Certified for NRC Seismic Category I (withstands 8.5-magnitude earthquakes), adapting to digital control requirements of third-generation nuclear technologies (e.g., AP1000, EPR) to ensure flow stability under complex conditions.

3. Check Valves – Unidirectional Flow Guardians

Application: Residual heat removal systems, safety injection pipelines
Innovative Design: Swing-type disc with permanent magnetic damping device closes instantaneously at reverse flow speeds ≥ 0.3m/s, reducing response time by 60% compared to traditional models; nano-ceramic coating on flow channels extends erosion resistance life to over 15 years.
Compliance Assurance: Passed IAEA radioactive material migration tests, with material performance degradation ≤10% under 10⁶ Gy radiation dose, meeting long-term radiation environment reliability requirements.

4. Ball Valves – Optimal Emergency Shutdown Solution

Application: Containment isolation systems, emergency cooling water pipelines
Performance Highlights: Triple-offset metal sealing structure enables 100,000 leak-free cycles; full-bore design with pneumatic quick-acting actuators completes emergency shutdown in 0.8 seconds, providing millisecond-level response for containment isolation.
International Certifications: Compliant with EURATOM radiation protection directives and French ASN aging test standards, passing 1,000 thermal shock cycles (-20°C~550°C) without sealing failure.

5. Butterfly Valves – High-Efficiency Choice for Large-Diameter Systems

Application: Circulating water cooling systems, HVAC pipelines
Product Advantages: Carbon fiber-reinforced plastic Valve body reduces weight by 50% and installation space by 30% compared to traditional steel valves; IP68-rated electric actuators adapt to long-term operation in high-humidity, salt-fog environments of coastal nuclear projects.
Maintenance Advantage: Modular design supports 30-minute quick disc replacement, reducing downtime costs; certified to ISO 15848-1 low-leakage standard for high-efficiency non-nuclear auxiliary systems.

6. Pressure Relief Valves – Final Barrier for Overpressure Protection

Application: Reactor pressure vessels, primary side of steam generators
Technical Breakthrough: Intelligent micro-lift structure achieves ±1% set pressure reseating accuracy; built-in wireless monitoring modules transmit real-time valve status (temperature/pressure/stroke), enabling predictive maintenance and extending inspection cycles by 40%.
Safety Certification: Passed China NNSA combined seismic-shock-vibration tests (1.5g horizontal acceleration), compliant with HAF604 nuclear equipment manufacturing standards, becoming a standard protective device for third-generation nuclear projects.

III. Technological Breakthroughs: Five Core Competencies of Nuclear-Grade Valves

The R&D and manufacturing of nuclear valves integrate materials science, mechanical engineering, and reliability technology. YYF has overcome industry bottlenecks through continuous innovation:

Radiation-Resistant Material System: Developed in collaboration with the Chinese Academy of Sciences, YYF-N1 austenitic stainless steel maintains ≥90% impact toughness after 10⁶ Gy radiation testing, 20% superior to international counterparts, solving long-term radiation-induced embrittlement.
Extreme Condition Sealing Technology: “Metal bellows + flexible graphite” composite sealing structure ensures leakage rate ≤1×10⁻⁹ mbar·L/s during -20°C to 550°C temperature cycles, meeting nuclear-grade 1 sealing standards for zero leakage under high temperature and pressure.
Seismic Structural Design: Using ANSYS full-condition simulation, valve damping ratio is increased to 0.05; anti-loosening bolt technology withstands 1.5g seismic acceleration without component detachment, certified to the highest international nuclear seismic design standards.
Corrosion Protection Solutions: For corrosive media like boric acid and radioactive ions, multi-layer cladding surfacing extends valve internal component life from 5 to 15 years, reducing maintenance frequency and radiation exposure risks during refueling cycles.
Digitalized Maintenance Empowerment: Equipped with YYF-IoT smart modules, supporting real-time status monitoring, fault prediction, and remote parameter configuration to help customers build digital-twin-based intelligent maintenance systems, reducing Operations and maintenance costs by 30%.

IV. Value Proposition for Nuclear Procurement: End-to-End Quality Control and Service Assurance

Selecting nuclear-grade valves is a strategic investment in safety systems. YYF builds competitive edges through full-life-cycle management:

End-to-End Compliance Control: From material traceability (blockchain tracking of alloy smelting batches) to welding processes (ISO 3834 nuclear-grade certification) and third-party testing (DNV GL full certification), ensuring alignment with IAEA, NRC, NNSA, and other international/domestic standards.
Customized Engineering Adaptation: Tailored solutions for different reactor types (e.g., CAP300, EPR), including flow channel optimization and interface standardization, reducing project adaptation cycles by 30% to meet strict nuclear project schedules.
Global Supply Chain Layout: Three major manufacturing bases in Asia, Europe, and the Americas, with critical spare parts inventory enabling 72-hour emergency delivery to mitigate customer supply chain risks.
Full-Life-Cycle Service System: Integrated support for “design-installation-maintenance,” including robotic maintenance in radiation environments, aging management assessment, and life extension solutions, optimizing customers’ total cost of ownership (LCC).

V. Industry Trends and Technological Prospects

With the global “double carbon” goal advancing, third-generation nuclear technologies (e.g., small modular reactors, high-temperature gas-cooled reactors) pose new challenges for valve performance: temperature resistance ≥700°C, lightweight design (composite materials), and fully digital monitoring. YYF is leading forward-looking initiatives:

Developing ceramic-matrix composite valves for fourth-generation reactors, with temperature resistance exceeding 1,000°C to meet extreme conditions of high-temperature gas-cooled reactors.
Building a valve digital twin platform to predict component aging trends through real-time Working condition simulation, enabling data-driven precision maintenance.
Leading the formulation of ISO/TC 153 international standards for nuclear valve reliability, promoting industry-wide technological upgrading and quality system improvement.

Redefining Fluid Control Excellence with Nuclear-Grade Standards

In the nuclear industry, where safety tolerances are absolute, YYF industrial valves embody a “zero-defect” philosophy throughout R&D, manufacturing, and service. From enhancing reliability in existing units to innovating designs for next-generation nuclear facilities, YYF leads with technological superiority and quality commitment, becoming a trusted partner for global nuclear power enterprises. Choosing YYF means choosing safety assurance beyond standards—where every fluid control action sets a new benchmark for nuclear-grade safety and efficiency.

Contact the YYF nuclear industry solutions team today to obtain customized valve configurations and jointly build a safer, more efficient clean energy future.

(Authored by the YYF Industrial Valve Technical Team. Reproduction requires proper attribution.)