Yongda
Yongda
Explore our primary selection of precision-forged valves, thermostatic actuators, and pressure safety components engineered for modern hydronic networks, water heaters, and localized fluid controls.
In modern macro-industrial contexts, fluid system safety is governed by fractional mechanical components. The miniature check valve serves as the critical node preventing fluid migration, pressure cross-contamination, and backflow anomaly in microfluidic environments. As automated assembly and precise flow requirements expand globally, mechanical designers demand ever-tighter engineering constraints.
Purchasing directors in markets spanning North America, Western Europe, and parts of the Asia-Pacific look for specific core assurances: material traceability (EN 10204 3.1), strict compliance with EU drinking water directives, NSF lead-free criteria, and precise repeatability. By designing custom internal elastomeric seats and calibrating spring cracking pressures, miniature check valve manufacturers secure uninterrupted uptime within high-stress operating envelops.
From smart HVAC distribution manifolds and condensing boilers to medical diagnostic devices and fuel cell modules, miniature valves provide the backflow shield. Custom body materials support highly volatile, high-temperature, or ultra-pure water media.
Our technology pipeline targets zero-maintenance fluid paths. Integrating advanced composite springs and proprietary O-ring formulations yields exceptional aging properties, allowing millions of operating cycles with micro-bar cracking accuracy.
With supply chains requesting localized risk mitigation, we supply fully integrated ODM services. By anchoring hot forging, high-tolerance CNC machining, and automated pressure decay testing in-house, we eliminate sourcing volatility.
Founded in 1996 in Yuhuan, Zhejiang ("China valve capital"), we have scaled to become one of the premier professional plumbing valve enterprises, integrating product design, development, production, and global sales.
Cokaren, as a newly established brand of our company, is committed to developing products with a more refined appearance and better quality, to provide a perfect service to customers.
"Keep flowing, keep warming" — Our brand promise ensures comfortable, efficient, and safer domestic water system installations globally.
Culture: Struggle, Enterprising, Pragmatic, Innovative
Tenet: Customer first, Quality based
Quality Policy: Fine work, no leakage
Efforts should be made to develop the company's capability and motivation, continuously improve the income and welfare of employees, and seek the agreement between company development and personal happiness.
To ensure total reliability under high pressure and temperature differentials, we maintain strict testing criteria. The table below represents the performance standards utilized across our micro-flow check valves and associated water distributor assemblies.
| Performance Parameters | Specification Range | Material Verification | Primary Industrial Applications |
|---|---|---|---|
| Body Materials | CW617N, CW614N, HPb59-1 Brass, DZR, Lead-Free Alloys | EN 10204 Metallurgical Traceable | Hydronic manifolds, boiler circuits, and potable water taps |
| Cracking Pressure | 0.02 bar to 0.5 bar (Customizable springs) | SUS302 / SUS316 Stainless Steel | Low-pressure loop separation & backflow defense |
| Seal Compounds | EPDM (NSF grade), FKM (Viton), HNBR, NBR | FDA & WRAS Compliant Formulations | High-temperature HVAC, chemical handling, drinking water |
| Max Operating Temperature | Up to 120°C (248°F) continuous | Thermal stability stress testing | Boiler auxiliary, mixing shunts, heating systems |
| Leakage Allowance | Bubble-tight (Zero visible air leakage at 6 bar gas pressure) | 100% pneumatic decay check | Microfluidic logic, clean environments, manifolds |
The company has a factory area of more than 45,000 square meters, and the actual usable area reaches 80,000 square meters. The company has more than 600 sets of advanced production and testing equipment, including more than 80 sets of special machine tools. With the help of these equipment, we can meet the different needs of different customers, and have exported our products to more than 20 countries.
Our quality management systems are certified according to ISO9001-2015 (Quality Management), ISO14001-2015 (Environmental Management), and ISO45001-2018 (Occupational Health and Safety Management). This unified structure ensures that every batch of brass components aligns with the highest international environmental and occupational benchmarks.
Our components are developed to function cohesively in hydronic energy distribution networks, floor heating manifolds, and intelligent HVAC mixing configurations.
The first line of defense in domestic water sanitation, designed to filter up to 98% of physical impurities in the distribution pipelines.
Incorporates a spherical spool design to precisely modulate and isolate the inflow and outflow of water loops inside central boilers.
Automatically vents trapped air bubbles from air-source water heating systems to maintain pressure balance and prevent air locks.
Blends return-line cold water with supply-line hot water to yield a stabilized domestic fluid output, shielding polymer tubes from thermal stress.
Coordinates loop zones to communicate directly with electrothermal manifold valves, refining localized temperature profiles.
Multi-functional assembly containing sediment strainers, purging taps, temperature probes, and pressure indicators for central manifolds.
Designed with high aesthetic qualities, strict material controls, and streamlined surface finishes to satisfy selective European and American projects.
Dual integration of a high-capacity cylindrical mesh screen within a full-port brass isolation valve.
Fine-threaded mechanical control valve allowing proportional adjustment of heat output on standard radiator loops.
Thermostatically balanced bypass and mixing unit optimized for low-temperature radiant floor heating systems.
Forged manifold bodies featuring micro-adjustable flow control meters and electric thermal actuators.
Heavy-duty cast brass bibcock assemblies with high flow paths and UV-resistant lever action handles.
Solid-wedge, non-rising stem brass gate valves engineered for isolation in agricultural and domestic networks.
Calibrated copper and brass adapter tubes offering linear flow and structural alignment for submetering devices.
High-precision machined barbed connections for soft polymer tubes, maintaining compliance with US standard threads.
In international engineering procurement, regulatory alignment and localization support are vital for commercial integration. Yuhuan Yongda Fluid Control maintains localized sales channels and engineering documentation parameters tailored to major destinations. Our OEM service handles custom drawing formats, 3D model simulations (IGS, STEP), finite element analysis (FEA) for pressure tolerance, and testing validation routines.
Whether conforming to European RoHS, CE, and WRAS certifications, or North American NSF/ANSI 61 lead-free guidelines for plumbing configurations, we maintain strict control over brass alloy compositions. Our CW617N and DZR (Dezincification Resistant) options ensure mechanical reliability and prevent leaching in aggressive or soft water territories.
CW617N is a specific European standard lead-restricted forging brass (CuZn40Pb2). Utilizing refined raw billets ensures optimal crystallization during hot forging, avoiding micro-fissures and material voids that lead to fluid pinholes. For regions demanding near-zero lead, DZR (CW602N) prevents selective zinc loss in hard water zones.
Common engineering queries answered by our senior fluid control team. Learn how to size, qualify, and specify check systems for your equipment.
Review our supplementary catalog featuring check valves, PE pipe compression fittings, sliding Pex connectors, and underfloor thermal control actuators.
