Yongda
Yongda
Explore our premium grade fluid control mechanisms engineered for residential, commercial, and HVAC operations worldwide.
In modern industrial and domestic piping networks, fluid flow integrity is paramount. Backflow—caused by drop-backs in pressure or siphonage conditions—poses a severe risk of contamination and critical equipment failure. A Check Valve Assembly (Check Valve Assy) operates as the primary mechanical defense mechanism, securing one-way transmission paths for liquids or gases.
Securing a CE certification for check valve assemblies is not merely a regional regulatory requirement; it is a global marker of high engineering reliability. The European Conformity standard verifies that these assemblies adhere to strict health, safety, and environmental protection guidelines. When applied to plumbing, heating, ventilation, and air conditioning (HVAC) systems, a CE-certified check valve ensures zero back-leakage, structural containment stability under high temperatures, and chemical compatibility with potable municipal water.
Prevents cross-contamination in municipal supply lines by maintaining localized pressure barriers. Protects expensive pump systems from water hammer stresses.
Heavy brass construction combined with professional spring-actuated design guarantees million-cycle lifespans under varying temperature conditions.
Adherence to EN standards guarantees seamless authorization for commercial distribution and integration into state municipal construction bids.
Founded in 1996 and located in Yuhuan, Zhejiang—widely recognized as the "China valve capital"—Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) has grown into an elite, highly specialized plumbing valve enterprise. Our core focus spans comprehensive product design, engineering research, testing, dynamic production, and international sales distribution networks.
Our expansive production catalog highlights mid-to-high-grade brass valves, custom brass fittings, and advanced HVAC control systems. With an emphasis on environmental protection, clean metallurgy, and fluid efficiency, our products are widely utilized and trusted by distributors, engineering firms, and consumers in North America, Europe, and Asia.
Under our premium brand, Cokaren, we deliver on our brand promise: "keep flowing, keep warming". Cokaren is dedicated to refining aesthetic appearance, optimizing hydraulic efficiency, and securing comfortable, leak-free environments in modern smart homes.
Yongda's physical facilities reach an actual usable area of 80,000 square meters, hosting over 600 sets of advanced production and testing apparatus. This includes more than 80 sets of high-precision dedicated machine tools. These facilities enable our engineering teams to satisfy diverse OEM requirements, maintaining a strict zero-leakage threshold.
Culture of Excellence: Our operational philosophy centers on: "Struggle, Enterprising, Pragmatic, Innovative". We stick to our guiding principle of "Customer first, Quality based" and our strict quality policy: "Fine work, no leakage."
We work to enhance our enterprise capabilities while continuously improving employee welfare, finding a healthy balance between corporate success and individual workplace fulfillment.
To ensure high quality across our entire product catalog, Yuhuan Yongda adheres strictly to international compliance guidelines. We maintain comprehensive certifications including:
Each check valve assembly goes through automated pressure testing to ensure it meets design parameters for sealing integrity and cracking pressure prior to packaging.
Integrated water systems require systematic heat balancing and fluid control mechanisms. Below is our engineering outline for heating and domestic fluid distribution systems:
See our key components used in modern HVAC and domestic sanitization systems:
Filters up to 98% of pipeline impurities to protect downstream components.
Controls boiler cold/hot water inflow with a low-friction spherical spool.
Discharges trapped air from heat pumps to ensure consistent water pressure.
Mixes system water to help stabilize temperatures and protect pipes.
Provides centralized temperature regulation across home zoning valves.
Monitors pressure levels and filters debris at manifold return points.
Distributes flow pathways evenly across floor heating system zones.
Modern check valve assemblies are used across a range of industrial and residential piping applications. Our components are designed to meet standard operating requirements for various installations:
Ensures hot fluid travels correctly through underfloor piping loops. Prevents cold water backflow from lowering manifold header temperatures.
Secures boiler inlet lines from back-siphoning hot water into residential drinking lines in the event of local main pressure loss.
Buffers supply pumps against back-pressure spikes. Protects impellers and housings from mechanical stress.
As regulatory requirements for municipal piping systems become more stringent, fluid control technology must adapt. Our engineering development focused on the following design goals:
1. Lead-Free Material Engineering: In response to international drinking water updates (such as NSF/ANSI 61 and EU Lead limits), our foundry utilizes alloy variations like bismuth-doped brass and DZR (Dezincification Resistant) materials. This prevents zinc leaching in high-salinity piping runs.
2. Low-Resistance Hydraulics: By refining the internal fluid paths of our spring check valves, we have lowered fluid friction coefficients (Cv rating), helping reduce pump energy requirements.
3. Smart HVAC Diagnostics: Integrating check valve assemblies with temperature and pressure sensors (like the Y9031 Smart Thermostat system) allows operators to monitor seal health and flow direction digitally.
Find answers to common questions about installing, maintaining, and certifying check valve assemblies:
Browse our selection of brass components and control valves for commercial and domestic heating layouts:
