Yongda
Yongda
Explore our foundational range of highly calibrated brass checkmate valves, radiator controls, and precision compression fittings engineered for structural integrity and leak-free lifetimes.
Founded in 1996, Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) is strategically positioned in Yuhuan, Zhejiang—widely recognized as the "China Valve Capital." As a pioneer among professional plumbing valve enterprises, Yongda focuses on the complete product lifecycle: custom engineering design, state-of-the-art laboratory testing, rigorous manufacturing, and global sales channels.
Our expansive product portfolio spans three core divisions: Brass Valves, Precision Pipe Fittings, and HVAC Control Components. Targeted directly at high-end global markets, our products prioritize eco-friendly metallurgy, structural safety, and high energy efficiency. This focus has earned the trust of demanding consumers across North America, the European Union, and developed Asian markets.
Under our premium brand, Cokaren, we carry forward a clear and powerful brand promise: "Keep flowing, keep warming". The Cokaren brand represents our commitment to refined aesthetics, zero-tolerance quality assurance, and dynamic engineering support, helping homes and businesses achieve safe, warm, and highly efficient hydronic systems.
How the checkmate valve (non-return check valve) operates as the critical line of defense in modern municipal, industrial, and residential fluid systems globally.
In highly regulated markets like North America and the EU, checkmate valves must strictly prevent backflow to safeguard drinking water lines. Our lead-free brass formulations meet NSF/ANSI 61 and Safe Drinking Water Act standards, ensuring trouble-free local compliance.
Modern commercial buildings use high-temperature hydronic loops where check valves face constant thermal cycling. Our DZR (Dezincification Resistant) brass valves withstand temperatures up to 120°C without risk of mineral leaching or structural fatigue.
With global green building regulations gaining momentum, the demand for smart, low-head-loss plumbing components is rising. The global check valve market is expanding steadily, driven by energy conservation mandates and modernized water delivery grids.
A closer look at how we design, optimize, and build checkmate valves to operate reliably in high-demand, high-performance environments.
We work exclusively with high-grade CW617N brass and specialty lead-free, dezincification-resistant alloys. By carefully balancing copper, zinc, and trace elements, we eliminate the risk of stress corrosion cracking, even when exposed to soft or highly chlorinated water systems.
Every hydronic design has distinct pressure requirements. Our engineering team customizes internal spring tensions to balance quick sealing action against low cracking pressures, maximizing flow capacity and minimizing system-wide energy losses.
Combining high-durability EPDM/FKM elastomer seals with precision-machined metal seats allows our valves to achieve tight sealing under both low and high backpressure. Every batch undergoes 100% pneumatic seat tests to verify leak-free performance before shipment.
Combining primary distribution manifolds, check valves, mixing units, and smart thermostats to form a cohesive, highly efficient building climate control system.
Standard and optional sub-assemblies for residential heating grids.
The first line of defense in domestic water sanitation, filtering out 98% of particulate impurities within the pipeline.
Manages water entry and exit for boilers, using a spherical spool to prevent unwanted backflow.
Discharges trapped air pockets in water heater networks, maintaining hydraulic balance and system efficiency.
Blends return water with hot supply lines, keeping temperatures steady and protecting piping from thermal stress.
Connects with actuators and manifolds to adjust room temperatures based on ambient readings.
Monitors pressure, measures local temperature, and filters particles ahead of the manifold connection.
Splits central flow into individual loop lines, allowing independent zone temperature adjustments.
To consistently supply demanding international markets, Yongda maintains an integrated quality management framework verified by leading global bodies:
Our core manufacturing philosophy, "Fine work, no leakage", drives our quality control procedures. We inspect incoming materials with spectrometer testing, maintain strict dimensional controls on CNC machinery, and pressure-test finished assemblies before packing.
Our corporate culture centers on being Struggle-driven, Enterprising, Pragmatic, and Innovative. We focus on enhancing our technical capabilities while building a safe, supportive, and rewarding work environment for our 600+ employees.
Common engineering and logistics questions from system integrators, distributors, and procurement teams.
We cast and machine valves in various grades of brass, including CW617N (EN 12165), HPb59-1, and specialty low-lead or lead-free brass. For acidic or high-chlorine applications, we offer Dezincification Resistant (DZR) brass alloys to prevent selective leaching and extend the valve's working life.
Our engineers configure the internal spring characteristics during the design phase. For gravity-fed loops or low-pressure pumps, we install low-tension stainless steel (SS302/SS316) springs for easy cracking. For high-velocity systems where quick closing is needed to prevent water hammer, we use higher-tension springs.
We follow a double-testing protocol. Castings undergo shell pressure testing to identify porosity, while completed assemblies receive pneumatic pressure tests at both low and high ranges. This ensures a bubble-tight seal under varying system backpressures.
For custom ODM projects, design evaluation and tool development typically take 25 to 30 days, followed by production runs of 30 to 45 days. Minimum order quantities vary by component size but generally start at 1,000 to 3,000 units to optimize raw material usage and machine setups.
Explore our wider catalog of floor heating manifolds, venting valves, angle stops, and heavy-duty brass piping connections built for commercial and domestic heating setups.
