Yongda
Yongda
Explore our top-tier brass fittings, gate valves, and smart HVAC control units designed to withstand the highest performance thresholds.
The municipal plumbing and wastewater sectors are undergoing a significant paradigm shift. As climate change increases the frequency of extreme storm events and overloaded sewer lines, backwater valves have transition from local code recommendation items to globally mandated structural components. At the absolute center of this emergency mechanical barrier is the Backwater Valve Flapper.
Historically constructed from simple mechanical hinges and standard plastics, modern flapper designs must balance fluid dynamics, chemical resistance, and immediate response sealing capabilities under zero-gravity conditions. Today's commercial flappers leverage advanced materials science. Exporters focusing on the European Union must align production with strict CE Certification standards, validating that the flapper mechanism can withstand backpressure, resist corrosive wastewater components (such as hydrogen sulfide and petroleum derivatives), and maintain seal integrity for decades.
Modern flappers utilize overmolded EPDM or NBR sealing surfaces. This provides elastomeric memory that prevents seal degradation under sustained sewage exposure.
Engineered with sloped surfaces to deflect grease and solids, avoiding build-up that historically caused check valves to stick open during backflows.
Established in 1996 in Yuhuan, Zhejiang—the recognized valve capital of China—Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) has grown to become a world-class manufacturing authority in high-precision plumbing valves, brass fittings, and commercial HVAC equipment.
Spanning a modern production area of over 45,000 square meters (with actual usable space reaching 80,000 square meters), our plant is equipped with more than 600 sets of advanced manufacturing and testing equipment. Among these, 80+ specialized multi-axis machine tools allow us to meet highly specific and custom parameters demanded by top-tier distributors across North America, Europe, and Asia.
Under our premium brand, Cokaren, we maintain a core engineering promise: "keep flowing, keep warming". We design and deliver environmental safety products that secure residential and industrial buildings against water damage, backflow contamination, and thermal inefficiency.
Understanding how automation, raw material integrity, and strict ISO compliance drive zero-defect global shipments.
Supply chain reliability is the ultimate asset for global B2B procurement officers. Operating from a highly integrated infrastructure, Yuhuan Yongda implements Factory 4.0 methodologies to transition production from manual assembly loops to fully automated, digitally monitored fabrication systems.
Our quality management policy—"Fine work, no leakage"—is backed by real-time diagnostic testing. Every production batch of brass check valves, manifolds, and backwater flappers undergoes spectral material composition checks (ensuring lead-free and anti-dezincification brass profiles), high-pressure pneumatic tests, and structural cycle trials. This process assures absolute compliance with global certification standards, including ISO9001-2015 (Quality Management), ISO14001-2015 (Environmental Management), and ISO45001-2018 (Occupational Health & Safety Management).
By keeping metallurgy, forging, precision machining, and validation testing entirely within a single ecosystem, we minimize lead times, eliminate external component bottlenecks, and secure cost efficiencies that we pass down to our global B2B partners.
Our specialized portfolio of high-efficiency HVAC, filtration, and water control components engineered for modern infrastructure.
The first line of defense in domestic water sanitation, designed to filter 98% of sediment and particulate impurities in supply lines.
High-precision spherical spool valve engineered to control hot and cold fluid inputs on commercial and domestic boilers.
Automatic pressure venting mechanism to evacuate air pocket anomalies within HVAC systems, boosting thermal dynamics.
Stabilizes thermal thresholds across secondary loops by balancing hot/cold supplies to protect pipeline durability.
Central control unit integrating local actuators and heating loops to maintain precision ambient temperatures.
Combines isolation control, mechanical particulate straining, and precise system monitoring tools in a single body.
Engineered distribution unit managing secondary underfloor hydraulic fluid pathways with flowmeters.
Discover our core catalog of heavy-duty check valves, mixing systems, manifolds, and brass air release hardware.
Heavy-duty brass ball valve equipped with an integrated stainless steel mesh filter screen to block downstream particles.
Manual temperature control valve utilizing custom brass components to regulate local heat profiles in hydronic systems.
High-efficiency temperature-mixing apparatus maintaining stable secondary loops in domestic water networks.
Premium multi-port underfloor radiant brass manifold unit for balancing heat distribution in buildings.
Durable, corrosion-resistant outdoor bibcock designed to survive frost events and aggressive usage cycles.
Full-bore female threaded water isolation gate valve offering zero pressure drops in open states.
Precision-threaded brass connector tubes establishing robust linkages for municipal water metering devices.
Heavy-walled brass barb adaptors manufactured to American plumbing tolerances and threading specs.
Strategic deployment parameters for engineering pipelines and municipal infrastructure projects.
Global pipeline distributors and civil contractors seek solutions that eliminate structural failures and reduce liability. A single backflow event can cost thousands in residential damage and pose severe biological safety threats. When sourcing backwater valve flappers and brass controls, engineers focus on two metrics: dynamic response sealing speed and chemical stability.
By specifying CE-certified assemblies, importers satisfy localized building codes (such as EN 13564 in Europe or local plumbing codes in North America). These guidelines enforce rigorous test models to check for reverse flow prevention, structural reliability, and mechanical pressure resilience.
Comprehensive engineering perspectives to resolve procurement, performance, and specification questions.
CE Certification ensures the backwater valve assembly, including the mechanical flapper, complies with EN 13564-1 standards. This regulation measures structural resistance against backing pressure (at least 0.5 bar), material degradation under warm wastewater flow, mechanical cycle durability (testing the flapper hinge mechanism over thousands of open-close iterations), and self-cleaning efficiency. It is required for sales in the European Economic Area.
Our quality pledge is "Fine work, no leakage." We enforce strict quality checks including spectrometer composition checks on incoming brass blocks, multi-stage hot-forging to eliminate internal microscopic air pockets, precise automated CNC machining, and individual pneumatic and water pressure testing. Every single valve must clear these checks before packaging.
EPDM (Ethylene Propylene Diene Monomer) and NBR (Nitrile Rubber) are the leading materials. EPDM is highly resistant to ozone, aging, and chemical compounds in municipal runoff. NBR is suitable when grease, oil, and petroleum derivatives are present in high concentrations. Both materials maintain sealing elasticity over wide temperature ranges.
Yes. With over 600 sets of advanced machinery and 80+ specialized multi-axis machine tools, our engineering department designs and manufactures customized valve components, manifold configurations, and flappers to meet client specification sheets, drawings, or packaging requirements.
Heavy-duty brass fittings, filtration systems, and boiler security kits engineered for modern commercial plumbing installations.
