Yongda
Yongda
Explore our engineering line of brass valve components, PEX fittings, and water manifolds for global distribution.
A comprehensive examination of fluid mechanics, mechanical performance, and design considerations for modern industrial piping projects.
At the heart of fluid dynamic safety is the pressure check valve (often referred to as a non-return valve). Its primary engineering function is simple yet critical: allow medium flow in one direction while preventing catastrophic backflow. The performance of these valves hinges upon the calibration of the cracking pressure—the minimum upstream pressure required to overcome spring tension and lift the sealing disc off its seat.
Yongda designs check valves using finite element analysis (FEA) to ensure that cracking pressures are calibrated precisely according to application requirements, ranging from low-cracking HVAC applications (0.02 bar) to high-pressure industrial lines. Proper calibration avoids the dangers of chatter (rapid cycling of the disc) and high-pressure drops that strain pumping machinery.
| Parameters | Standard Specification | High-Performance Option |
|---|---|---|
| Body Material | HPb59-1 Brass / CW617N | DZR Brass (CW602N) / Lead-Free |
| Sealing Ring | NBR / EPDM | FKM (Viton) for High Temp |
| Nominal Pressure | PN16 (1.6 MPa) | PN25 (2.5 MPa) |
| Working Medium | Water, Neutral Fluids | Glycol Solutions, Gas, Oil |
| Thread Type | ISO 228 (BSP) | NPT / ANSI B1.20.1 |
In modern hydronic and domestic distribution loops, dezincification resistance (DZR) is vital for ensuring longevity when valves are exposed to corrosive water chemistries. Traditional brass contains zinc, which can leach out over time under high thermal stress and chlorine exposure, leaving behind a porous copper shell prone to weeping. Using specialized alloys like CW617N and CW602N (DZR) ensures structural soundness across decades of continuous service.
Our sealing architecture employs a dual-contact surface design. Precision-ground metallic seats combined with premium elastomeric seals (EPDM/FKM) ensure zero leakage (Rate A according to EN 12266-1 standard testing). EPDM is used for potable water systems up to 120°C, whereas FKM is utilized in specialized solar HVAC networks where ambient media heat can rise to 150°C and above.
Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) was founded in 1996 and is strategically located in Yuhuan, Zhejiang—widely celebrated as the "China Valve Capital". As an industry-leading, professional plumbing valve enterprise, Yongda integrates cutting-edge product design, intensive engineering R&D, advanced manufacturing, and global sales channels.
Our diverse product portfolio is structured across three core segments: brass valves, plumbing fittings, and HVAC distribution components. Positioned in the mid-to-high-end spectrum, our products emphasize environmental safety, advanced energy management, and long-term durability, making us a preferred partner for global markets in North America, Europe, and Asia.
Cokaren is our premium-facing brand dedicated to developing residential and light-commercial fluid solutions with refined aesthetics and uncompromising performance. Cokaren’s foundational brand promise, "Keep flowing, keep warming", drives our continuous innovation in floor heating systems, manifolds, and balancing valves.
By focusing on smart thermal comfort and water-safety infrastructure, Cokaren implements a dynamic operational strategy aimed at consistent global expansion. We strive to provide comfortable living environments through precision engineering and world-class quality systems.
How Yongda leverages advanced technology to ensure stable output, quality repeatability, and competitive pricing structures.
With a factory area of over 45,000 m² (usable area of 80,000 m²), our workshops house over 600 sets of production machinery, including 80+ specialized CNC machining stations. Hot-press forging processes eliminate surface porosity and prevent cracks, yielding superior structural density compared to standard sand casting.
Our quality pledge is simple: "Fine work, no leakage." Every valve undergoes pneumatic shell testing at 6-8 bar and hydraulic seat leakage verification up to 1.5 times the nominal working pressure (PN) before packing. This rigorous protocol practically eliminates field failures and warranty claims.
Yongda has passed ISO9001:2015 Quality Management Systems, ISO14001:2015 Environmental Management Systems, and ISO45001:2018 Occupational Health & Safety Systems. We strictly design to meet European CE, RoHS, and North American plumbing regulations.
Integrated fluid control assemblies designed for hydronic heating, domestic hot water distribution, and plant engineering.
The first line of defense in domestic water sanitation, filtering up to 98% of particulate impurities in supply lines.
Used to control the inflow and outflow of cold and hot water in boilers, utilizing a high-precision spherical spool.
Designed to discharge trapped air in hydronic systems to prevent cavitation and ensure heat transfer efficiency.
Mixes high-temperature supply and return water to achieve stable, lower-temperature flows for floor heating.
Monitors indoor temperatures and signals actuators to balance flows for high energy efficiency.
Multi-functional unit filtering dirt, purging air, and measuring supply pressure/temperature in modern installations.
Pioneering Next-Generation HVAC and Smart Fluid Infrastructure Components
Environmental regulations globally are tightening requirements around lead content in potable water systems. Our metallurgical roadmap focuses on transitioning to next-generation lead-free alloys (such as CW724R silicon brass or bismuth-based brass). These new alloys conform to NSF/ANSI 61 and EU RoHS directives while maintaining excellent machinability and corrosion resistance.
Integrating mechanical check valves with smart sensor elements is a core project. Future valves will incorporate micro-differential pressure sensors and thermal probes, transmitting performance diagnostics directly to building management systems (BMS) to forecast maintenance cycles and spot system leakages.
To resist abrasive media and scaling in hard-water zones, we are refining chemical plating technologies. Electroless nickel plating (ENP) and specialized chrome coatings are applied to internal seating parts to limit friction, reduce mineral scaling, and extend the lifespan of mechanical springs beyond 150,000 compression cycles.
Through computational fluid dynamics (CFD) research, we are profiling internal body cavities to lower fluid resistance. Maximizing flow rates (Kv/Cv values) while minimizing physical dimensions allows engineers to reduce pumping energy costs and design smaller mechanical equipment skids.
Providing international OEMs and distributors with the logistical, legal, and engineering support required for streamlined sourcing.
We work with international logistics providers to offer diverse delivery options including FOB, CIF, DDU, and DDP. We handle customs clearance, export declarations, and tax filings to ensure freight moves seamlessly from our Yuhuan docks to your warehouse.
All bulk orders are accompanied by complete material test reports (MTRs) and EN 10204 3.1 chemical certification. This level of traceability guarantees that our brass alloys contain the exact copper, lead, and zinc fractions specified during the RFQ phase.
We supply wholesale customers with custom private-label solutions. This includes automated laser engraving of part codes, serial numbers, and custom brand logos directly onto the brass valve bodies, alongside custom retail box packaging and barcoding.
Technical guidance and sourcing support regarding pressure check valves, brass materials, and hydronic heating loops.
High-grade valves, strainers, adapters, and manifolds manufactured under ISO quality control.
