Yongda
Yongda
Explore our industrial-grade female brass valves, fittings, and energy distribution systems engineered for global markets.
For over two decades, Yuhuan Yongda (formerly Yuhuan Yongda Plumbing Co., Ltd.) has defined precision, reliability, and technical innovation within the international fluid management sector.
Founded in 1996, the company is strategically situated in Yuhuan, Zhejiang—widely celebrated as the "China Valve Capital." As an integrated engineering powerhouse, we govern the entire pipeline of product design, technological development, structural production, and worldwide sales operations.
Our expansive industrial catalog specializes in three core system segments: brass valves, high-performance fittings, and advanced HVAC components. Positioned in the middle and high-grade global markets, our products deliver exceptional environmental protection characteristics, robust material longevity, and optimized fluid mechanics. This makes our lines highly favored by engineers, builders, and wholesalers across North America, Europe, and Latin America.
Under our newly established premier brand, Cokaren, we are driving forward a new era of engineering refinement, delivering fluid components with tighter dimensional tolerances, more pristine surface finishes, and unparalleled performance. Staying true to Cokaren's brand promise—"keep flowing, keep warming"—we design our water distribution accessories to bring long-term thermal comfort, reliability, and peace of mind to residential and industrial environments worldwide.
A deep engineering exploration of metallurgy, thread integrity, and structural pressure retention required for safety-critical installations.
We source premium, eco-friendly brass formulations such as CW617N, DZR (Dezincification Resistant), and low-lead/lead-free variants matching California AB1953 standards. These ensure high corrosion resistance and long structural lifespans.
Female threads are cut with rigorous tolerance parameters on high-speed CNC machines. We strictly test threads using calibrated plug gauges to guarantee compliance with ISO 228 (BSPP), ANSI B1.20.1 (NPT), and BSPT standards.
Our quality control operates on the core principle: "Fine work, no leakage." Every individual valve undergoes automated helium, pneumatic, and hydrostatic tests up to 1.5 times its rated pressure class (PN16/PN25) before shipment.
In municipal water distribution, HVAC, and industrial processes, the female thread acts as the ultimate structural anchor point. Because a male connection is threaded internally, the female valve body experiences high tensile hoop stress. Inferior thin-walled brass castings frequently split during installation or under cyclic thermal stress. At Yuhuan Yongda, we run finite element analysis (FEA) to reinforce stress concentration areas around the hexagonal or octagonal wrench flats. This ensures our valves easily withstand the torque limits required for a leak-free seal.
Operating from Yuhuan, Zhejiang gives us immediate access to a deep ecosystem of raw material refineries, specialized surface finish providers, and logistical pathways. This cluster effect yields massive speed-to-market advantages for global OEMs and ODMs.
Key highlights of Yuhuan Yongda's operational scale include:
For modern engineering and construction procurement, a valve is only as good as its certifications. We maintain a comprehensive compliance system that mitigates risk for international buyers and ensures easy local approvals.
Our core operational systems are certified to international standards:
Additionally, our lead-free drinking water valves meet rigorous standards like NSF/ANSI 61 and NSF/ANSI 372 for North America, CE marks for the European Economic Area, and WRAS approvals for the United Kingdom.
Comprehensive system solutions mapped out for HVAC, boiler water loops, and underfloor hydronic heating installations.
The first line of defense in domestic water sanitation, filtering 98% of incoming physical debris and particulate impurities.
Precision-engineered to regulate cold and hot water loops directly entering or exiting high-performance domestic boilers.
Automatically exhausts accumulated micro air bubbles from heat pumps and boilers to protect pumps from cavitation damage.
Combines hot supply and cool return water to maintain stable hydronic temperatures, protecting underfloor piping systems.
Coordinates with thermal actuators to adjust room-by-room temperatures, optimizing energy usage.
Filters debris and controls flow at the manifold, measuring local temperatures and system pressures simultaneously.
Distributes flow to individual hydronic loops, balancing floor temperatures across commercial and residential zones.
Addressing supply chain challenges, shipping logistics, and compliance demands faced by commercial valve procurers.
Industrial operations and commercial heating projects run on tight timelines. Delaying a valve delivery can halt multi-million dollar HVAC installations. We mitigate logistics risks through structural order forecasts, raw material hedging, and shipping integrations from nearby Ningbo and Shanghai ports.
Our raw material inventory reserves include multiple tons of standard brass bars. This safeguards our production cycles against volatile global copper market fluctuations, ensuring price stability for long-term ODM supply agreements.
We provide full white-label and custom-branded packaging services for industrial brands and HVAC wholesale groups. We laser-etch part numbers, flow direction markers, pressure ratings, and custom company logos directly onto the forged brass bodies.
Packaging solutions range from protective individual bulk packs to retail-ready custom boxes, complete with translated installation guides and UPC barcodes for North American and European distributors.
| Target Region | Key Standard Requirements | Yongda / Cokaren Compliance Method |
|---|---|---|
| North America | NSF/ANSI 61, NSF 372, Lead-Free Brass, NPT Threads | Low-lead forging brass alloy C37700 / C46400, 100% thread gauge verified. |
| European Union | EN 12164, CE Marking, BSPP ISO 228 Parallel Threads | Standard CW617N and CW614N copper alloys, CE declarations. |
| United Kingdom | WRAS Approved Materials, BS 21 BSPT Tapered Threads | Specifically formulated EPDM seals and lubricant grease certified to British standard requirements. |
| Global HVAC | ISO 9001:2015, PN25/PN40 Mechanical Integrity | Comprehensive burst, cycle life, and low-temperature sealing laboratory evaluations. |
Industrial and hydronic applications demand distinct design criteria based on regional installation practices and local environmental conditions.
In modern European residential developments, underfloor radiant heating is key to energy conservation. Our manifolds and mixing shunts work directly with motorized actuators to control flow at a room-by-room level. The female threads on these control valves must connect easily to PEX-AL-PEX compression fittings, requiring precise thread profiles to prevent thermal-cycling fatigue and leaks.
Boilers face high heat and pressure, leading to dissolved gas buildup. Automatic air vents and boiler angle valves help maintain optimal system performance. By using female-threaded brass components, technicians can make solid connections to steel or copper pipes without needing specialized soldering equipment, simplifying field maintenance and retrofitting.
In large commercial buildings, motorized zone valves regulate fan coil units. Condensation is common in chilled water setups. Our forged brass valve bodies resist external sweating and galvanic corrosion when connected to steel piping networks, ensuring long-term system uptime.
Common questions from fluid piping system engineers, QA directors, and global sourcing buyers.
A: BSPP (British Standard Pipe Parallel) is a straight thread requiring a gasket or O-ring for sealing. BSPT (British Standard Pipe Tapered) and NPT (National Pipe Thread) are tapered threads that seal via thread interference, typically requiring PTFE tape or pipe dope. We run specific multi-axis CNC programs for each standard and use calibrated thread plug gauges to ensure reliable fit-ups on site.
A: High zinc concentrations in standard brass can leach out when exposed to acidic or chlorinated water, weakening the metal. We offer certified DZR brass alloys (like CW602N) containing trace amounts of arsenic. This elements acts as an inhibitor, maintaining structural integrity over decades of service.
A: Once we confirm the initial CAD file or 3D step model with the client, we can deliver physical brass prototypes in 15 to 25 business days. This process covers custom mold tooling, test forging, CNC post-processing, and initial pressure-bench evaluations.
A: We run 100% inline pneumatic leak testing on all manufactured valves. Additionally, our QA lab performs destructive burst tests, hydraulic fatigue testing up to 100,000 cycles, and thermal cycling assessments (ranging from -20°C to 120°C) to verify mechanical performance under extreme conditions.
A: Yes. We work closely with leading global testing agencies such as SGS, TÜV, and IAPMO. We provide material testing data sheets, raw mill certifications, and engineering drawings to help clients secure national approvals quickly.
Complete your flow control setups with our heavy-duty compression fittings, manifolds, and heating system accessories.
