Yongda
Yongda
In modern industrial plumbing and HVAC engineering, control over fluid dynamics is critical. The term "Bulb Valve" refers to specialized spherical spool valves or integrated boiler control configurations designed to deliver minimum pressure drop while maintaining strict bubble-tight shutoff. These mechanical solutions are crucial in high-temperature heating loop systems, thermal solar configurations, and water distribution networks.
With global sustainability efforts driving energy efficiency standards, fluid system designers are moving away from traditional gate systems to intelligent spherical valves and manifolds. Key benefits include lower fluid turbulence, zero leakage under high pressure, and easy adaptability to modern electronic actuators. Cokaren, utilizing Yuhuan Yongda Fluid Control's extensive engineering capabilities, meets these global requirements with premium-grade lead-free brass alloys, advanced nickel plating, and ISO-certified manufacturing practices.
Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) was established in 1996 in Yuhuan, Zhejiang, recognized globally as the "China Valve Capital." Over nearly three decades, the company has grown into a leading manufacturer specializing in product design, fluid mechanics development, forging, automated machining, and international distribution.
Our product portfolio focuses on three core categories: brass valves, precision fittings, and HVAC distribution components. Positioned in the mid-to-high-grade market segment, our products emphasize environmental sustainability and material purity, making them highly sought after by commercial plumbing distributors and engineering firms across North America, Europe, and Asia.
The core philosophy driving Yuhuan Yongda is defined by four foundational pillars: Struggle, Enterprising, Pragmatic, and Innovative. By prioritizing customer requirements and raw material quality, we verify that every manifold, check valve, and boiler safety fitting meets the strict tolerance thresholds required by modern piping installations.
Our quality policy—"Fine Work, No Leakage"—is backed by real-time test benches, pneumatic bubble-testing systems, and hydraulic cycle fatigue systems. This ensures that every brass element leaving our assembly line is tested to withstand the pressure ratings specified for underfloor heating manifolds, mixing shunts, and water distribution grids.
Modern buildings rely on complex energy distribution loops. High-performance brass components control temperature, balance flow rates, and regulate system pressure to minimize energy consumption.
Serves as the primary line of defense in domestic water networks. This unit filters up to 98% of particulate impurities and sediment, protecting downstream fixtures and control valves from wear.
Designed to control cold water inflow and hot water outflow loops in wall-mounted boilers. Features a spherical brass spool for smooth shutoff and reduced pressure loss.
Automatically discharges accumulated air pockets from heat pump loops, preventing air locks, cavitation, and system noise.
Balances hot supply and cold return water to deliver stable temperatures to underfloor loops, protecting PEX pipe systems from overheating.
An intelligent control unit that communicates with thermal actuators on the manifold to maintain set temperatures across heating zones.
An integrated manifold accessory designed for filtering impurities, isolation, venting, and monitoring dynamic pressure and fluid temperature.
Exporting fluid control products to international markets requires strict compliance with mechanical safety and environmental protection codes. Yuhuan Yongda operates under a robust quality and environmental management framework, backed by international certifications:
Our brass metallurgy is carefully audited to meet strict North American lead-free standards (such as NSF/ANSI 61 and 372) and European CE / RoHS specifications. This guarantees safe operation in drinking water installations and high-reliability industrial setups.
Understanding raw material compositions and mechanical performance data is essential for specifying valves in municipal and industrial projects.
We source certified CW617N brass for standard European applications and lead-free DZR (Dezincification Resistant) brass for potable water systems. DZR prevents selective zinc leaching in corrosive, soft-water environments, preserving the mechanical integrity of threaded connections over decades.
Unlike cast brass, which can suffer from micro-porosity and internal stresses, our hot-forging process aligns the grain structure of the brass alloy. This increases tensile strength, allowing our valves to handle PN16 and PN25 pressure limits with safety margins.
Products undergo precise shot blasting, followed by electroplated nickel or chrome finishes. This improves external corrosion resistance and reduces scaling in hard water, ensuring clean operations in municipal networks.
| Valve Type | Common Materials | Pressure Rating | Temperature Range | Common Thread Standard |
|---|---|---|---|---|
| Boiler Angel Valve (Y5001) | HPb59-1 Brass / CW617N | PN16 | -10°C to 110°C | ISO 228 (BSP) / NPT |
| Manifold Control Valve | CW614N / Lead-Free DZR | PN10 | 0°C to 95°C | G Thread / Compression |
| Water Filter Valve (Y9021) | CW617N / Stainless Mesh | PN16 | 5°C to 70°C | Female / Male Threads |
| Heavy-Duty Gate Valve | HPb57-3 Brass | PN20 | -20°C to 120°C | NPT Threaded Ends |
Cokaren, the premium brand of Yuhuan Yongda, focuses on high-precision fluid management and HVAC components. Cokaren is dedicated to developing products with refined finishes, tight tolerances, and superior reliability for modern hydronic heating installations.
With our brand promise, "keep flowing, keep warming," Cokaren integrates energy-efficient solutions into underfloor heating, water distribution, and smart boiler controls. Our engineering teams continuously refine valve geometries to minimize flow resistance, reducing pump energy consumption and lowering operational carbon emissions.
Through Cokaren, Yuhuan Yongda is transforming from an OEM component supplier into a provider of integrated hydronic system solutions, establishing a brand trusted by engineers worldwide.
Purchasing high-volume brass valves for commercial projects requires understanding the variables that influence product costs.
Brass pricing is closely tied to the London Metal Exchange (LME) copper index. Our ODM quotes use transparent formulas linked to current raw material costs. This helps project procurement teams plan their budgets and manage price fluctuations.
For custom valve geometries (like specialized angle connections or integrated sensor ports), we design custom forging molds. For high-volume production runs (typically 10,000+ units), we offer full tooling fee rebates to optimize unit economics.
Costs vary depending on machining tolerances, threading types (such as BSP, NPT, or G), and surface treatments (including chrome plating, nickel plating, or bare brass). We tailor these options to fit your project requirements and budget.
Explore additional integrated solutions manufactured in Yuhuan, Zhejiang, designed for residential, commercial, and HVAC projects.
Combines a heavy-duty ball valve with a built-in stainless steel mesh filter. Ideal for space-constrained boiler water inlets.
Provides precise manual throttling to regulate zone temperatures in hydronic radiator layouts.
Maintains consistent loop temperatures by blending hot supply water with cooled return water.
Distributes heated water to individual heating zones, featuring dynamic flow meters for balancing.
A reliable outdoor garden hose valve manufactured from corrosion-resistant, lead-free brass.
Designed for full-flow plumbing applications, offering minimal pressure drop and low turbulence.
Machined brass pipe connectors that secure connections to utility water meters.
Precision-threaded, reliable adapters designed to connect flexible tubing to rigid systems.
Technical guidance and buying information regarding our ODM brass valves, material compliance, and pricing structures.
Our pricing is primarily influenced by raw material weight, current LME copper index values, manufacturing complexity (such as multi-axis CNC machining), specific plating requirements (nickel vs. chrome), and order volume. We provide volume discounts for large projects.
Yes. We offer DZR (Dezincification Resistant) and low-lead brass alloys (such as CW617N, C37700, and C46400) that meet lead-free drinking water regulations in North America (NSF/ANSI 61 and 372) and Europe.
For standard brass thread fittings, the MOQ starts at 5,000 units. For larger components like HVAC manifolds and mixing valves, the MOQ is typically 500 to 1,000 units, depending on the tooling required.
We test every manifold before it leaves the factory. Each unit undergoes pneumatic testing at 6 to 8 bar for a set period to ensure all ports, valves, and joints are completely leak-free, in line with our quality policy: "Fine Work, No Leakage."
Yes, we offer complete OEM and ODM services. This includes forging custom brand logos onto valve bodies, custom thread configurations (BSP, NPT, G), and customized commercial packaging.
Our facility is certified under ISO 9001:2015 for quality management, ISO 14001:2015 for environmental management, and ISO 45001:2018 for occupational health and safety standards.
For long-term contracts, we use dynamic pricing linked to the LME copper index. This updates unit prices based on raw material costs at the time of manufacturing, ensuring fair pricing for both sides.