Yongda
Yongda
Understanding the strategic and metallurgical challenges faced by industrial procurement engineers globally.
In modern HVAC systems, radiant floor heating, and municipal potable water networks, the demand for Multilayer Composite Pipes (MLCP) has grown exponentially. Combining the benefits of plastic and metal, PEX-AL-PEX pipes require joints that offer identical structural integrity, chemical resistance, and ease of installation without using open flames or complex hydraulic crimpers. Compression fittings remain the premier mechanical joining method due to their high reliability, clean execution, and capacity for field maintenance.
Global procurement teams prioritize three major parameters when sourcing compression fittings: chemical composition (specifically dezincification-resistant DZR brass / CW602N or low-lead brass compliance such as CW617N and NSF 372), mechanical tolerances, and compliance certifications. Operating temperatures of up to 95°C and pressures of 10 bar require precise geometric sealing between the brass compression olive, PEX tube insert, and internal EPDM/NBR O-rings to prevent creep and thermal cycling failure.
| Alloy Designation | Primary Application | Standards & Compliance | Key Technical Benefit |
|---|---|---|---|
| CW617N (CuZn40Pb2) | European Potable Water & Heating | EN 12165 / EN 12164 | Excellent hot forging properties & high tensile strength |
| CW602N (DZR) | High-Corrosion Water Environments | ISO 6509 Dezincification Testing | Resists selective zinc leaching, ideal for hard water |
| C37700 / Lead-Free Brass | North American Plumbing Systems | NSF/ANSI 61 & NSF/ANSI 372 | Compliance with <0.25% weighted lead standards |
Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) was founded in 1996 and is located in the "China valve capital" – Yuhuan, Zhejiang. As a professional, pioneering plumbing valve enterprise, we focus closely on holistic product design, advanced development, streamlined production, and cross-border sales.
Our high-tier products are categorized into brass valves, specialized fittings, and custom HVAC systems. Positioning ourselves in the mid-to-high grade, we highlight ecological safety, lead-free brass formulations, and environmental protection, making our solutions highly favored by commercial clients in North America, Europe, and domestic high-end markets.
Cokaren, our newly established premium brand, focuses on highly refined appearances, tighter mechanical tolerances, and unmatched service support. It embodies our dynamic corporate strategy to deliver world-class comfort directly into smart homes and industrial spaces alike.
Integrating multi-stage valves, manifolds, and compression joints into comprehensive domestic & commercial distribution layouts.
The first line of defense in domestic water sanitation, capable of filtering 98% of particulate impurities inside standard service lines.
Optimized spherical spool valve engineered to control cold inflow and hot fluid outflow, resisting sudden thermal expansion cycles.
Designed to continuously discharge excess air pockets in water heaters and air source pumps, preventing airlocks and cavitation.
Thermally-balanced mixing system designed to mix hot feed with cooler return water, stabilizing pipeline temp and extending pipe life.
Intelligent, digital control hub managing thermal zone valves to dynamically adjust localized ambient room temperatures.
Advanced utility valves offering dual filtration, flow isolation, structural manifold connections, and precise temperature-pressure diagnostics.
Engineered brass manifold balancing circuit loops and distributing multi-room heating fluids through precise flow-meter controls.
Exploring the chemistry, physics, and design specifications that guarantee a 50-year structural service lifetime.
When connecting multilayer pipes containing aluminum to brass fittings, galvanic corrosion is a serious risk if the metal layers touch. Our engineering roadmap addresses this by integrating a non-conductive polyethylene washer at the shoulder of the insert, preventing aluminum-brass contact. Additionally, we use dual high-performance EPDM O-rings placed in precision-machined grooves to maintain seal pressure even under thermal expansion and contraction cycles (-20°C to +110°C).
We are actively developing bismuth-alloyed lead-free brass to stay ahead of changing global drinking water standards. Furthermore, we are designing hybrid plumbing components that combine compression mechanics with IoT-enabled sensors. This technology allows real-time leak detection and localized temperature monitoring, offering advanced warning features for municipal water networks and radiant floor installations.
Maximizes sealing area against the inner PEX layer, resolving pipe ovality problems caused by uneven cutting tools during installation.
Our parallel and tapered threads are precision-ground, ensuring high torque retention and preventing the compression nut from backing off under high water hammer conditions.
Forged brass fittings undergo strict thermal treatment to relieve internal stress, preventing stress corrosion cracking (SCC) in damp, high-stress installation environments.
Meeting the strict quality benchmarks of international code agencies through continuous testing and certifications.
At Yuhuan Yongda Fluid Control Co., Ltd., quality is not just a slogan; it is the core of our business. Our manufacturing facility has passed ISO 9001-2015 for Quality Management Systems, ISO 14001-2015 for Environmental Management Systems, and ISO 45001-2018 for Occupational Health and Safety.
Our quality policy, "Fine work, no leakage," is strictly applied across our production lines. Every single valve and multilayer compression fitting is subjected to automated pneumatic pressure testing before packaging. This ensures zero defects reach our global OEM/ODM sourcing partners.
We utilize advanced spectrometers, hardness testers, hydraulic test benches, and dezincification depth testing chambers to verify that every melt meets target metallurgical specifications.
Culture: Struggle, Enterprising, Pragmatic, Innovative
Tenet: Customer first, Quality based
Explore our specialized catalog, featuring precision engineering and high-durability surfaces.
Combines reliable fluid isolation with a built-in mesh screen, capturing debris to protect downstream equipment.
Manual and motorized temperature adjustments, designed for stable multi-zone temperature control.
Stabilizes return flow loops in radiant heating systems to optimize temperature regulation.
Solid brass distribution headers configured for radiant floor networks, supporting up to 12 loop connections.
Durable garden faucet designed to operate smoothly even in sub-zero winter conditions.
Heavy-duty brass gate valves providing unrestricted fluid passage and minimal pressure drops.
Precision-drawn brass connector tubes designed to mount municipal water meters securely and flatly.
Quick-assembly connectors designed to match North American hose sizing standards.
Answering complex engineering queries regarding installation, material limits, and custom designs.
