Yongda
Yongda
Engineered For Reliability, Designed For Global Pipeline Standard Compliances
Founded in 1996, Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) is strategically headquartered in Yuhuan, Zhejiang—the internationally renowned "Valve Capital of China". Over the past three decades, our company has evolved into a premier vertically integrated enterprise specializing in the design, testing, manufacturing, and distribution of high-grade brass valves, custom hose check valves, connection fittings, and HVAC system solutions.
We operate in mid-to-high-end international markets, focusing on environmental sustainability, lead-free raw material innovation, and strict zero-leakage parameters. Leveraging our flagship sub-brand, Cokaren, we pursue our core brand promise: "Keep Flowing, Keep Warming". By focusing on refined industrial appearance, strict metallurgical analysis, and unmatched mechanical tolerances, Cokaren delivers next-generation water system accessories to satisfy home comfort, industrial processing, and HVAC distribution grids worldwide.
With a massive footprint including over 45,000 square meters of physical land area (spanning over 80,000 square meters of multi-level production workspace) and 600+ advanced manufacturing machines, our team meets the high-volume requirements of Fortune 500 piping system suppliers and commercial project planners across North America, Europe, and Asia.
How China Hose Check Valve Design Prevents Backflow & Safeguards Piping Networks
A Hose Check Valve (also known as a non-return valve or one-way valve) is a critical fluid component designed to allow liquid or gas to flow in only one direction. This prevents contaminated or back-pressured medium from siphoning back into the primary clean water grid.
Our check valves employ spring-assisted closure dynamics. As flow travels in the correct direction, the fluid pressure overcomes the internal spring tension (the cracking pressure, typically calibrated between 0.02 and 0.05 bar), shifting the disc/plunger forward. If downstream pressure rises or flow ceases, the high-tensile stainless steel spring instantly pushes the plunger back against the EPDM/Viton seal seat, creating an impenetrable barrier.
| Performance Parameter | Standard Specification Range | Material Options & Structural Standards |
|---|---|---|
| Nominal Diameter (DN) | DN15 to DN50 (1/2" to 2" Threads & Hose Barb Integrations) | ISO 228 Thread Standards, NPT, or BSP compatible |
| Working Pressure Rating | PN16 to PN25 (Max 362 PSI for heavy industrial grids) | Forged High-Strength Brass Body (CW617N / HPb59-1) |
| Cracking Pressure | 0.02 - 0.05 Bar (Low resistance start-up threshold) | SUS304 / SUS316 Stainless Steel Spring Coils |
| Operating Temperature | -20°C to +110°C (Suitable for domestic boilers, solar heating & cold mains) | Premium EPDM, Viton, NBR soft elastomer seals |
| Media Compatibility | Drinking Water, Glycol solutions (HVAC), Gas, Air, Light Oils | Dezincification Resistant (DZR) lead-free brass formulations |
From High-Performance Heating Grids to Municipal Fluid Safety Infrastructures
Installed within water divider manifolds and hydronic heating systems to prevent backflow and thermal siphoning. Protects sensitive heat exchangers and electric thermostat components by keeping flow patterns strictly unidirectional.
Acts as the fundamental safety valve downstream of boiler water inlets. Prevents high-temperature steam or chemically treated boiler loop fluids from re-entering potable domestic cold water lines.
Embedded directly into the spray guns or intake hoses of high-pressure cleaning machinery to hold pressure when trigger is released. Prevents high-pressure kickbacks from damaging inline water pumps or filters.
Prevents concentrated fertilizers and agricultural chemicals from siphoning back into clean groundwater tables or community water sources during power shutdowns or pump pressure drops.
Ensures that municipal main pipes keep high pressure across multistory residential zones. Restricts cross-contamination from adjacent piping loops during pipeline maintenance and utility repairs.
Designed for chemical dosing skids, pneumatic control grids, and pharmaceutical production loops requiring rapid valve response, reliable material compatibility, and zero trace lead leaching.
Operating out of Yuhuan, Zhejiang, Yuhuan Yongda Fluid Control Co., Ltd. benefits from a highly optimized industrial ecosystem. The Yuhuan valve industry cluster is the largest integrated valve manufacturing and raw material source on earth. This concentration grants our operations immediate access to high-purity copper smelting, state-of-the-art forging tooling, surface treatment centers (nickel/chrome plating), and advanced sealing compound suppliers.
Our in-house capabilities include over 80 specialized heavy-duty machine tools and automated CNC production cells. From the initial multi-stage hot forging press to final ultrasonic parts washing and automated pressure decay testing, our entire manufacturing process is executed under a single quality control system. This vertical integration reduces lead times and minimizes the quality variations common with multi-tier outsourcing.
With a massive warehouse footprint and direct access to major maritime hubs like Ningbo and Shanghai Ports, we offer global partners reliable shipment delivery times, custom packaging design, and container consolidation services even during peak international logistics seasons.
At Yuhuan Yongda Fluid Control Co., Ltd., quality is not just a slogan; it is the core of our business model. Our official quality mandate is: "Fine work, no leakage." To back this guarantee, 100% of our produced hose check valves, ball valves, and manifolds undergo rigorous pneumatic and hydrostatic pressure testing before packaging.
The company has established and strictly operates under a comprehensive trio of international management standards:
Our products carry certification and standard approvals including CE Certification for European distribution, and conform to material standards like ASTM F1807 for plumbing configurations. This compliance facilitates importing, inspection, and installation processes for plumbing contractors globally.
Driving Smart Water Distribution and Eco-Friendly Green Metallurgy
With international regulations tightening on heavy metal levels in drinking water systems, our technical department is shifting production lines toward lead-free bismuth/silicon-brass alloys. These alternatives preserve machining characteristics while eliminating lead exposure.
In collaboration with local universities, we are engineering sensor-integrated check valves and manifolds. These units communicate temperature, pressure spikes, and potential backflow failures to HVAC automation networks in real-time.
By adopting 3D Finite Element Analysis (FEA) and fluid flow simulation software, we refine the interior surface geometries of our hose check valves. This reduces turbulence and prevents cavitation, prolonging elastomer seal life.
Direct Answers from Our Engineers on Hose Check Valve Mechanics, Selection, and Manufacturing
Premium Fluid Spares Engineered by Yuhuan Yongda & Brand Cokaren
