Yongda
Yongda
Explore our highly-engineered fluid management components designed for hydronic heating, HVAC, and industrial water distribution.
Founded in 1996, Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) is strategically situated in Yuhuan, Zhejiang—widely recognized as the "China Valve Capital". As a pioneer in the plumbing and HVAC valve industry, Yongda has committed over 28 years to the end-to-end design, advanced development, precision production, and global supply of high-grade brass valves, fittings, and complex energy distribution systems.
Operating under our premier premium brand, Cokaren, we pursue the core promise: "keep flowing, keep warming". Cokaren is dedicated to delivering highly refined, robust, and environment-friendly water control accessories that secure maximum thermal comfort and leak-free reliability for modern residential and industrial settings. We target mid-to-high-tier international markets, ensuring that our products strictly comply with the environmental and safety standards of North America, Europe, and Asia.
In high-pressure water systems, piping networks, and commercial heating loops, fluid reverse flow poses a critical risk to pumps, boilers, and delicate measuring instruments. Swing check valves and dual-plate check valves have been standard solutions for decades; however, they are highly prone to "water hammer"—a devastating pressure surge triggered when a valve slams shut abruptly under reverse flow conditions. This is where Axial Check Valves (often termed non-slam check valves or silent check valves) prove their absolute mechanical superiority.
Axial check valves feature a central spring-assisted disc aligned coaxially with the piping axis. As fluid enters the valve chamber, the streamlined venturi flow path minimizes turbulence and reduces localized pressure drops. The spring-loaded mechanism is calibrated to provide immediate closure response. Crucially, the closure occurs as the forward fluid velocity decelerates to zero, before the actual reverse flow takes hold. This preventive, rapid closure design effectively dampens pressure waves, preventing water hammer and eliminating piping vibrations completely.
| Performance Characteristic | Axial Check Valve (Cokaren Design) | Traditional Swing Check Valve | Dual Plate Check Valve |
|---|---|---|---|
| Water Hammer Prevention | Excellent (Non-Slam) | Poor (High risk of slamming) | Moderate |
| Pressure Drop (Energy Loss) | Minimal (Optimized Venturi) | Medium to High | Medium |
| Closing Speed | Very Fast (Spring-assisted) | Slow (Gravity/reverse flow dependent) | Moderate |
| Maintenance Interval | Extremely Long (No wear joints) | Frequent (Hinge pin wear) | Moderate |
Our operational ethos is built around engineering excellence, strict environmental compliance, and worker health safety standards.
At Yuhuan Yongda, quality is not merely an inspection checkpoint; it is integrated into every phase of our manufacturing cycle. Our quality management policy is straightforward and absolute: Fine work, no leakage. This directive mandates 100% pneumatic testing for all brass valves, pressure testing, and dimensional inspection on our coordinate measuring machines (CMM).
We believe in establishing a symbiotic development ecosystem. By continually improving employee safety, wages, and welfare, we align our company’s corporate growth with the personal happiness of our skilled operators and engineers. This motivated workforce is the foundation of our zero-defect quality guarantee.
ISO9001-2015 certified design, development, and assembly operations.
ISO14001-2015 eco-friendly manufacturing & lead-free alloys processing.
ISO45001-2018 certified occupational health protection for 600+ staff.
For global procurement managers, identifying a reliable factory is a balancing act between strict quality requirements, reliable lead times, and competitive unit pricing. Yuhuan, Zhejiang, is the epicenter of the global brass valve supply chain. Sourcing axial check valves and HVAC components from a vertically integrated manufacturer like Yuhuan Yongda yields several distinct advantages:
Our raw brass materials are analyzed spectrographically to ensure absolute alignment with European CW617N, CW614N, and North American low-lead (C46400 / C46500) compliance profiles, preventing dezincification corrosion (DZR).
Operating over 600 sets of advanced tooling machinery, including 80+ specialized multi-axis CNC machine centers, we maintain tolerances within microns for perfect sealing geometry.
From forging press machines to surface treatment (nickel plating, sandblasting) and final packing lines, the entire production ecosystem is concentrated in Zhejiang, avoiding shipping delays.
Modern HVAC systems demand structured integration. We provide complete solutions combining filtration, zone regulation, manifold distribution, and temperature controls.
The first line of defense in domestic water sanitation, filtering 98% of line impurities.
Used to control the inflow and outflow of cold/hot water in boilers, featuring a spherical spool.
Automatically discharges excess air in hot-water systems, ensuring system stability.
Blends hot and cold return water to stabilize temperatures and protect subfloor piping.
Axial check valves are widely utilized across complex water loops and heating layouts due to their compact dimensional profile, silent operation, and long service intervals.
Multi-story buildings rely on high-capacity booster pumps to distribute drinking and utility water. Whenever a pump turns off, the gravity-induced return shock wave can break standard swing valves and rupture joints. Cokaren’s spring-assisted axial check valves respond instantaneously, preventing flow reversal and cushioning pressure transients to protect vertical pipelines.
In floor radiant heating systems, secondary pumps are often installed to regulate independent zones. The integration of compact check valves ensures that water flows in a single direction, preventing thermal backflow and securing accurate temperature balancing across manifold systems (such as the Y1001 Manifold series).
Closed-loop HVAC systems operate continuously. Our low-friction, high-flow coefficient axial valves reduce hydraulic resistance, yielding significant yearly electrical power savings for the circulating pumps.
Sourcing valves globally requires deep alignment between buyer specifications and the factory's production capabilities. Over decades of supplying markets in North America, Germany, Italy, and the UK, Yuhuan Yongda has standardized a transparent global partnership workflow:
Every hot-forged brass batch is stamped with raw material heats for tracing. Mill Test Certificates (MTC) containing chemistry values and tensile properties are available upon request.
We machine standard threads with high precision, including NPT (National Pipe Taper) according to ANSI B1.20.1 for the Americas, and G / BSPP / BSPT according to ISO 228-1 for European applications.
To match your branding, we offer multiple surface options, including sandblasted brass, nickel plating, and chrome plating to increase wear and corrosion protection.
Technical answers to common engineering, installation, and procurement questions regarding non-slam check valves.
Discover our comprehensive collection of ISO-certified brass ball valves, manifold accessories, and HVAC control solutions.
