Yongda
Yongda
Explore our primary technical offerings, engineered for high reliability, minimum pressure drop, and long-term mechanical resilience in standard and high-performance fluid systems.
Within modern multi-scale industrial, HVAC, and municipal infrastructure, maintaining unidirectional fluid dynamics while managing backflow vulnerabilities remains a critical parameter for mechanical design engineers. Backflow and hydraulic surge events are not merely operational disturbances; they jeopardize system sanitation, damage high-value hardware (such as booster pumps and boiler manifolds), and introduce significant energy inefficiencies.
High-precision ODM spring check valves mitigate these mechanical vulnerabilities by providing reliable, automated sealing. When system pressures drop below the cracking limit of the internal spring mechanism, the valve closes instantly to prevent reverse flow. This is critical for preventing cross-contamination in water systems, protecting heat exchangers from dry-firing, and ensuring stable pressures in hydronic heating networks.
As smart cities demand lower power consumption and zero-maintenance infrastructure, valve engineering has transitioned to high-performance brass alloys (e.g., DZR, CW617N) and optimized hydraulic flow paths that minimize pressure drops and cavitation wear.
An in-depth look at materials, engineering specifications, and spring mechanism mechanics.
Engineered with calibration ranges from 0.02 bar to 0.05 bar (0.3 to 0.7 PSI). Our design utilizes precision-tensioned stainless steel springs (SS302/SS304/SS316) to ensure low friction loss and quick valve response during sudden pressure changes.
Utilizing hot-forged CW617N brass and lead-free DZR (Dezincification Resistant) materials that exceed ASTM and EN standards. This prevents corrosion and leaching in potable water, ensuring long-term durability.
Available in NBR for general water applications, EPDM for elevated-temperature HVAC manifolds, and FKM (Viton) for chemically active industrial fluids, supporting operation up to 120°C (248°F).
| Technical Metric | Standard Specification | Heavy-Duty Industrial Specification | Testing Methods |
|---|---|---|---|
| Nominal Diameter (DN) | DN15 - DN50 (1/2" to 2" NPT/G) | Up to DN100 (4" Flanged) | ISO 228 Thread Conformity |
| Nominal Pressure (PN) | PN16 (232 PSI) | PN25 / PN40 (362 to 580 PSI) | EN 12266-1 Hydrostatic test |
| Operating Temp Range | -10°C to 90°C (Water) | -20°C to 150°C (Solar Thermal/HVAC) | Cyclic Temperature Pressure Chamber |
| Cracking Pressure | 0.02 - 0.03 bar (Standard) | Adjustable (0.05 to 0.5 bar custom) | Dynamic Flow-Loop Transducers |
| Body Tensile Strength | ≥ 380 MPa (CW617N) | ≥ 410 MPa (Lead-Free DZR Brass) | Spectrochemical & Tensile Pull Tests |
Founded in 1996 in Yuhuan, Zhejiang—known as the "China Valve Capital"—Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) has grown into a leading manufacturer of premium HVAC and plumbing equipment. With over 25 years of experience, we specialize in high-quality brass valves, fittings, and HVAC manifolds.
To serve the premium market, we launched our premium brand Cokaren, guided by the promise: "Keep flowing, keep warming." Cokaren focuses on refined designs, tight tolerances, and eco-friendly materials, helping our international clients build efficient, high-performance hydronic distribution systems.
Operating a 45,000-square-meter facility (with an active footprint of 80,000 square meters) and equipped with 600+ advanced manufacturing and quality testing machines, we supply reliable ODM flow control solutions to over 20 countries across North America and Europe.
Rigorous verification pathways and certified quality management systems.
Our commitment to reliability is backed by third-party certifications. Yongda is ISO 9001:2015 certified for quality management, ISO 14001:2015 certified for environmental safety, and ISO 45001:2018 certified for occupational health and safety.
For international markets, we manufacture products to meet specific regulatory standards: CE approvals for European heating systems, NSF/ANSI 61 and 372 lead-free compliance for North American drinking water systems, and RoHS-compliant surface plating for electronic actuators. Every spring check valve undergoes 100% pneumatic seat-leak testing prior to shipment, ensuring zero-defect performance in the field.
How our check valves, actuators, and manifolds integrate to form high-performance, energy-efficient heating and distribution networks.
The first line of defense in domestic water sanitation, filtering 98% of pipeline impurities.
Controls hot and cold water in boilers with a low-friction spherical spool design.
Ensures stable system pressure by venting excess air from air-source water heaters.
Mixes hot and cold water in pipelines, stabilizing temperatures and protecting pipes.
Integrates with equipment to monitor and adjust room temperature.
Filters sediment, controls return manifolds, and monitors temperature/pressure.
Distributes flow to multiple heating zones while regulating balancing pressures.
Integrated with spring check modules to prevent backflow and thermal siphoning.
Strategic R&D goals for next-generation flow control components.
Developing bismuth- and silicon-modified brass alternatives that meet global drinking water standards while maintaining machinability and corrosion resistance.
Using Computational Fluid Dynamics (CFD) to design internal flow paths that reduce turbulence, wear, and system pressure drops.
Integrating check valves and sensors directly into manifolds to enable real-time diagnostic reporting for commercial HVAC systems.
Technical answers to common questions about ODM spring check valves and systems.
Select from our certified catalog of high-durability valves, brass fittings, and hydronic manifolds designed for commercial and domestic installations.
