Yongda
Yongda
Explore our highly-durable brass fittings, zone controls, and connection adapters optimized for residential heating and industrial water supply lines.
Establishing operational excellence in pipeline components since 1996.
In modern hydraulic engineering, check valves play a critical role in preventing backflow, mitigating fluid pressure spikes, and protecting sensitive machinery like pumps and smart meters from water hammer effects. As a leading check valve fitting exporter, our products are engineered with calibrated cracking pressures to ensure optimal flow dynamics.
Our standard brass vertical spring-loaded check valves use robust, anti-corrosion materials capable of handling varying pressure classes. By integrating precision-machined springs and high-quality elastomeric seals (such as EPDM or NBR), we guarantee no leakage under low pressure, protecting domestic and commercial pipe manifolds efficiently.
Understanding the distinction between swing, lift, and double-plate check valves is essential for global buyers. Swing check valves offer minimal pressure drop, making them ideal for high-volume gravity flows, whereas spring-loaded inline models excel in high-pressure vertical configurations where rapid closure prevents reverse flow shock waves.
Located in the heart of "China's Valve Capital"—Yuhuan, Zhejiang—Yuhuan Yongda Fluid Control Co., Ltd. leverages a world-class industrial cluster. Our factory coordinates raw material supply chains, specialized tooling centers, and thermal processing workshops to drive down unit production costs without compromising design accuracy.
Raw Material Integrity: We utilize hot-forging technology with premium lead-free and standard CW617N, C37700 brass alloys. Unlike cold-rolled materials, hot-forging ensures zero molecular porosity, ensuring the brass bodies resist high internal stress and dezincification over decades of exposure to hard water.
Process Automation: Our shop floor houses over 600 sets of advanced testing and CNC machinery, including 80+ specialized multi-axis machine tools. This robust automation allows us to offer highly customized OEM threads (NPT, BSPT, BSP) to match localized infrastructure requirements across Europe, North America, and Southeast Asia.
Deploying specialized brass valve assemblies to power smart city grids, residential comfort zones, and green energy distribution networks.
Integrating mixing shunts, automatic bypass valves, and multi-port brass manifolds (like our Cokaren series) to optimize thermal load distribution, saving up to 18% in domestic heating energy consumption.
Preventing cross-contamination of domestic drinking water from auxiliary industrial circuits through the deployment of double check valve assemblies and reliable anti-siphon mechanisms.
Precision-engineered inline spring check valves protect expensive volumetric and ultrasonic water meters from transient reverse pressure waves, preserving data logging accuracy.
A reference guide for global sourcing agents and fluid mechanics engineers comparing material standards.
| Alloy Grade | Copper (Cu) % | Lead (Pb) % | Tensile Strength (MPa) | Applicable Standards |
|---|---|---|---|---|
| CW617N (EN 12164) | 57.0 - 59.0% | 1.6 - 2.5% | ≥ 380 | European Plumbing Standards |
| HPb59-1 | 57.0 - 60.0% | 0.8 - 1.9% | ≥ 400 | GB/T Standards (Domestic / General Export) |
| DZR Brass (CW602N) | 61.0 - 63.0% | 1.7 - 2.8% | ≥ 350 | Dezincification Resistant (Acidic/Chlorinated Water) |
| Lead-Free C37700 | 59.0 - 62.0% | < 0.25% | ≥ 370 | NSF/ANSI 61 (North American Drinking Water) |
Our dedicated brand—Cokaren—operates under the core promise: "keep flowing, keep warming". We design and engineer premium water distribution panels, HVAC system accessories, and thermostatic mixing controls aimed at achieving consistent indoor temperatures.
Every dynamic check valve, air vent, and boiler safety group bearing the Cokaren name undergoes stringent QA procedures. From the spectrum chemical analysis of raw materials to 100% pneumatic testing for air tightness (ensuring "fine work, no leakage"), our goal is to deliver failure-free performance for residential projects.
We are fully certified with ISO9001-2015 (Quality), ISO14001-2015 (Environmental), and ISO45001-2018 (Occupational Health and Safety). Our focus is to bridge the gap between competitive Chinese manufacturing costs and international quality standards, providing reliable support for global B2B distributors.
Empowering purchasing managers to mitigate lead time risks, control supply chains, and secure certified products.
We accommodate customized specifications including BSPP, BSPT, NPT, and compression fittings, matching plumbing and gas networks across different regions seamlessly.
We optimize custom duty filings and maritime packaging, helping you consolidate container spaces from Yuhuan and Ningbo ports to lower total freight costs.
Each production run features laser-etched heat numbers, pressure ratings, and brand markings on the brass bodies, ensuring complete traceability from raw material to installation site.
Read expert answers to technical and commercial questions about brass valves and pipeline fittings.
Engineered to handle extreme temperatures and prevent pressure drops inside underfloor piping networks.
