Yongda
Yongda
Explore our flagship selection of brass check valves, distribution manifolds, and plumbing assemblies engineered for demanding municipal, commercial, and residential applications.
Check valves, also widely recognized as non-return or one-way valves, play an indispensable safety and operational role in fluid systems. Their fundamental engineering purpose is to allow liquid or gaseous media to flow unimpeded in a single direction while instantaneously preventing backflow. In industrial piping, municipal water networks, and domestic heating systems, uncontrolled backflow can result in structural failure, pump damage, contamination of clean water resources, and the dreaded phenomenon known as "water hammer."
The efficiency of a check valve is determined by its mechanical architecture, sealing capability, and metallurgical composition. Leading design configurations include spring-loaded inline check valves, swing check valves, and vertical check foot valves. For high-demand applications, brass alloys like CW617N, C37700, and lead-free DZR (Dezincification Resistant) brass are selected due to their superb tensile strength, anti-corrosion properties, and mechanical durability. An optimized spring tension ensures a precise "cracking pressure" (the minimum upstream pressure required to open the valve), while premium elastomer seals (NBR, EPDM, or FKM) guarantee zero leakage at high temperatures and pressures.
A powerhouse in design, engineering, and manufacturing of brass valves and HVAC components since 1996.
Nestled in Yuhuan, Zhejiang—widely celebrated as the "China Valve Capital"—Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) has spent over 27 years building an elite tier-1 manufacturing reputation. Spanning a vast 45,000 square meters footprint with an actual usable factory area exceeding 80,000 square meters, our facility is equipped with state-of-the-art technological systems. Our plant features over 600 sets of advanced processing machinery, including 80+ dedicated multi-axis special machine tools, forging presses, automatic CNC centers, and multi-stage testing benches.
Our premium products are structured into three specialized branches: brass valves, custom plumbing fittings, and high-performance HVAC systems. Guided by our premium brand, **Cokaren**, we bring to life our core corporate philosophy: *"Keep Flowing, Keep Warming"*. Cokaren represents refined engineering, premium aesthetic appeal, and uncompromising durability. By positioning our products in the mid-to-high-end spectrum, we place safety, environmental protection, and sanitization at the forefront of our designs, earning trust in North American, European, and regional global markets.
An anatomical look at the geographic, metallurgical, and economic competitive advantages of Yuhuan valve factories.
Yuhuan operates as a dense industrial cluster, hosting raw brass smelters, hot-forging facilities, surface finishing, precision tooling, and logistics operators within a 15km radius. This localized concentration drastically compresses lead times and minimizes transportation costs.
Transitioning from manual casting to automated multi-direction hot forging and ultra-precise CNC turning centers. This automation ensures high dimensional accuracy, uniform wall thickness, and eliminates micro-porosity defects in brass bodies.
High production capacity and automated raw material recycling systems (such as reclaiming brass shavings) allow Chinese manufacturers to yield high-quality, ISO-certified brass components at a fraction of the cost of domestic Western foundries.
At Yuhuan Yongda, quality is not a department—it is our absolute operational baseline. Our company has successfully established and maintained three major globally-recognized framework certifications: **ISO9001-2015** (Quality Management System), **ISO14001-2015** (Environmental Management System), and **ISO45001-2018** (Occupational Health and Safety Management System). Our quality policy is straightforward yet uncompromising: *"Fine Work, No Leakage."* This standard applies to every stage of our operations, from raw billet spectroscopy to high-pressure air and water hydrostatic seal testing.
Beyond engineering excellence, our enterprise fosters a corporate culture defined by being *"Struggle-oriented, Enterprising, Pragmatic, and Innovative."* We believe that our growth is deeply intertwined with the well-being of our 600+ personnel. By continuously upgrading our workspaces, optimizing machinery safety, and raising employee compensation, we align commercial progress with personal prosperity. When you purchase from our factory, you are not just acquiring metal assemblies; you are investing in a certified, ethically-managed, and highly sustainable global supply chain.
A modular system designed to regulate, balance, and distribute heating media in complex residential and industrial environments.
The first line of defense in domestic water sanitation, filtering 98% of physical impurities in the pipeline to protect downstream check valves.
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Designed to control the cold and hot water inflow and outflow in modern boiler systems, using a spherical spool for smooth actuation.
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Optimized to discharge accumulated air pockets within hot water systems, ensuring optimal hydraulic pressure and heat transfer efficiency.
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Regulates supply temperatures by mixing cold and hot return water, stabilizing heat output and preventing thermal shock inside pipelines.
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Integrates with motorized valves and sensors to dynamically manage zonal temperatures based on real-time ambient feedback.
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Designed to filter particulate matter, isolate sections for maintenance, and monitor localized water temperature and system pressure.
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Distributes primary fluid flows evenly across independent system loops, providing individual balance adjustments for zone regulation.
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Expertly forged brass hardware developed to meet international sanitary, mechanical, and pressure-resistance criteria.
Combining flow shutoff with inline particulate filtration, reducing space requirements in compact domestic plumbing hookups.
Allows users to manually set radiator fluid flow based on comfort, maximizing energy efficiency across zonal spaces.
A highly dynamic system block incorporating return-path temperature monitoring for efficient underfloor heat control.
Multi-port configuration crafted from heavy-gauge extruded brass, mitigating internal turbulence and scaling.
Robust outdoor supply tap featuring double-threaded stems and anti-siphon capabilities to prevent backflow contamination.
Designed for deep straight-line flow with minimum pressure drop, featuring a solid wedge gate and non-rising stem.
Direct-fit brass connectors for residential water meters, designed to withstand torque adjustments during install.
Precision thread fittings complying with US plumbing dimensions, providing leak-proof hose barb connection paths.
For industrial buyers, engineers, and OEM brands, sourcing check valves from an overseas factory requires more than comparing base price sheets. To ensure system reliability and avoid shipping non-compliant components, procurement managers should specify critical operating parameters when submitting a Request for Quote (RFQ). A comprehensive RFQ helps factories provide highly accurate pricing and match the exact metallurgical composition to the application.
Key information to include in your RFQ:
Connect directly with the manufacturing floor at our Zhejiang facility. Minimize intermediaries and secure custom configurations tailored for your distribution networks.
An extensive look at our auxiliary products engineered to integrate into your existing municipal and heating networks.
Maintains a stable downstream outlet pressure despite fluctuating upstream flow variations.
External thread connection with specialized surface passivation to resist chemical scaling.
Designed with a quick-release union connection for rapid gardening and utility setup.
Lever-actuated full port plumbing valve optimized for reliable flow regulation.
Automatic over-pressure relief system designed to protect domestic hot water storage tanks.
Electroplated finish with a integrated padlock eyelet to prevent unauthorized water use.
Thick brass wall construction with tight threaded seals for utility piping control.
A dual-purpose valve that intercepts debris while preventing backflow.
Standard structural strainer featuring a removable stainless mesh screen for maintenance cleaning.
Deep-well intake valve equipped with a mesh intake filter to keep suction lines primed.
Linear hydraulic chamber design minimizing internal fluid friction and flow restrictions.
Integrates an auxiliary pump circuit and a bypass check valve to maintain consistent temperatures.
Dynamic water mixing hub for radiant floor setups, regulating water temperatures.
Multi-zone temperature controller with an integrated pressure bypass loop.
Maintains a minimum flow rate when zone valves close, protecting the circulation pump.
A dual-purpose brass end cap featuring an integrated manual purge screw for air bleeding.
Equipped with an internal float mechanism to continuously vent air bubbles during operation.
Designed to withstand elevated heating system pressures and purge trapped air pockets.
Multi-functional terminal node offering combined manual drainage and automatic air venting paths.
Engineered for PE (polyethylene) pipes, providing reliable mechanical pull-out resistance.
Nipples, elbows, and unions configured with BSPP or NPT threads for piping systems.
Designed to custom drawing profiles, allowing you to tailor specific threads and length configurations.
Expert engineering answers to common technical queries raised by global procurement and system installation teams.
The difference lies in their mechanical operation and installation orientation. A **swing check valve** features a hinged disc that swings open when upstream fluid flows, closing when pressure drops. They are low-friction and work well in horizontal pipelines, but require gravity to close and are prone to water hammer in vertical pipelines. An **inline spring-loaded check valve** uses an internal spring to press the disc onto the seat, closing the valve *before* fluid velocity reverses. This quick-closing action mitigates water hammer, and allows the valve to be installed in any orientation (horizontal, vertical, or angled).
Brass provides an optimal balance between mechanical performance, longevity, and affordability. Compared to plastics like PVC, brass offers superior thermal limits and mechanical strength to resist pipe expansion and contraction. Compared to stainless steel, brass is significantly easier to machine on high-speed CNC lines, reducing manufacturing costs. For municipal drinking water applications, specialized lead-free or DZR brass alloys are used to satisfy strict sanitary criteria while preventing dezincification corrosion.
Cracking pressure is the minimum inlet pressure required to overcome the spring force and open the valve. Under-specifying cracking pressure can cause the valve to stay open under low flows, resulting in backflow. Over-specifying cracking pressure causes a high pressure drop across the valve, reducing flow rates and forcing pumps to work harder. Matching the valve spring rate to your system's operational flow profile is key to efficiency.
Our quality control protocols require every single check valve to pass testing before packaging. This includes **metallurgical analysis** of raw bars using spectrometers, **pneumatic pressure testing** to detect pinhole defects or casting porosity in the forged body, and **hydrostatic seal testing** to verify elastomer seat sealing under variable backflow conditions. This process ensures our "Fine Work, No Leakage" standard is consistently met.
For OEM orders, clients provide technical drawings (CAD or PDF formats), specifying material standards (e.g., CW617N, C37700), thread types (NPT, BSPP, BSPT), custom laser engraving, and branding. Our engineering department verifies the design, creates initial tooling samples, conducts laboratory testing, and sends prototypes for approval. Once approved, the project transitions to high-volume forging and CNC finishing.
Explore our secondary selection of brass gas controllers, actuators, temperature regulators, and adapters built to withstand high cycle rates.
