Yongda
Yongda
Explore our foundational brass valves and custom multi-layer piping solutions built to exceed international safety regulations.
Check valves are the silent guardians of mechanical plumbing systems, designed with a singular, mission-critical purpose: to prevent backflow and secure directional integrity within complex pipelines.
Whether regulating high-pressure central heating boilers or securing municipal drinking water infrastructures, our engineered check valves rely on advanced spring-loaded dynamics and precise material choices to prevent catastrophic system cross-connection and damaging water hammer effects. By analyzing hydraulic dynamics under varying volumetric pressures, our design team produces solutions that feature exceptionally low cracking pressures combined with structural bubble-tight seal integrity.
As a leading manufacturer, we pay close attention to structural metallurgy. Standard brass alloys risk dezincification (corrosion) when exposed to aggressive fluid compositions. Our engineering standard employs high-grade, dezincification-resistant (DZR) lead-free brass formulations. Every custom casting undergoes extensive finite element analysis (FEA) to confirm optimized fluid flow coefficient (Cv) values, minimizing internal turbulence and keeping pressure drop levels minimal.
Founded in 1996 in Yuhuan, Zhejiang—the renowned "China Valve Capital." We are a fully integrated OEM/ODM manufacturer shaping the future of HVAC and plumbing technology.
Spanning a modern factory area exceeding 45,000 square meters (with usable facility space reaching 80,000 square meters), our plant hosts over 600 sets of advanced manufacturing and testing equipment. Among these, more than 80 custom machining tool stations manage high-precision tolerances required for zero-leakage configurations.
We specialize in three strategic categories: brass valves, plumbing fittings, and high-efficiency HVAC distribution products. Positioned as a mid-to-high-grade supplier, our primary objective centers on environmental safety, water purity, and thermal optimization—qualities trusted by demanding markets across North America and Europe.
Our newly launched sub-brand, Cokaren, is built on the brand promise "keep flowing, keep warming." Under Cokaren, we blend clean product aesthetics with advanced engineering features to deliver comfortable, reliable residential heating and fluid systems globally.
Addressing the complex regulatory landscapes, chemical standards, and supply-chain pressures faced by international engineering procurement officers.
Modern systems require strict adherence to lead-free regulations like NSF/ANSI 61 and California AB1953. Our supply chain utilizes verified, high-purity lead-free brass formulations to ensure safe drinking water and full regional compliance.
Premature valve failures can lead to system shutdowns and costly liability claims. We address this risk with rigorous cycle testing and strict tolerance control, protecting heating loops and manifold systems from pressure surges.
Oxygen-rich domestic water networks can corrode low-quality brass. We utilize alloy compositions containing specific inhibitors that safeguard our check valves from dezincification and stress corrosion cracking.
Discover how our valves, filters, manifolds, and mixing systems coordinate to form highly efficient commercial and residential building utility networks.
Radiant heating networks depend on uniform thermal distribution. Our high-precision manifolds work alongside mixing shunts and temperature controllers to optimize hot water supply loops. Integrated air vent valves continuously purge trapped air pockets, preventing localized system cold spots and maintaining system pressure equilibrium.
By implementing a dedicated bypass system using differential pressure valve configurations, our HVAC networks regulate volume fluctuations automatically. This prevents mechanical stress on secondary circulation pumps, ensuring consistent quiet operation and extending overall system lifetimes.
From the primary boiler feed down to the heating loop manifolds, our components form a unified, energy-efficient thermal distribution system.
The first line of defense in domestic water sanitation, filtering 98% of physical impurities in the pipeline.
Designed with a spherical spool to securely control both cold and hot water feeds into the boiler system.
Discharges trapped air in water heaters to maintain system stability and heat transfer performance.
Combines warm and cold water return loops to stabilize system water temperatures and protect piping.
Coordinates multiple zone dampers to manage ambient temperatures in intelligent underfloor configurations.
Features integral strainers and discharge mechanisms for cleaning line debris while monitoring temperature and pressure.
Manages and balances thermal water distribution across independent building comfort zones.
We believe in the strict policy: "Fine work, no leakage." This commitment drives our operations from raw material checking to final assembly testing. We have successfully implemented and maintained certification programs for three core systems:
Every valve batch undergoes 100% seal integrity testing under both hydrostatic and pneumatic pressure configurations. Our QA laboratories verify precise structural thread dimensions, spring tension tolerances, and rubber chemical compatibility, ensuring long-term operational lifetimes for every component.
Additionally, our corporate culture focuses on the connection between company development and personal happiness—improving employee working environments and skills, which directly translates to refined quality and care in the products we supply.
The fluid control industry is changing rapidly. Here is how our research and development programs are adapting to meet the demands of tomorrow.
Development is underway on next-generation check valves featuring integrated pressure and temperature sensors. These sensors communicate real-time hydraulic data directly to building management systems, enabling predictive maintenance planning.
To meet tightening environmental standards across Western markets, we are expanding our production lines for lead-free copper-zinc-bismuth alloys, maintaining excellent machinability while offering clean, safe contact surfaces.
Using advanced Computational Fluid Dynamics (CFD) software, our engineering team reshapes internal flow chambers to minimize pressure drop, helping clients reduce energy consumption across large circulation pumps.
Get professional, detailed answers to common technical queries about brass check valve applications, mechanical configurations, and standards compliance.
Spring-loaded check valves utilize a calibrated internal spring to close the valve disc just before flow velocity drops to zero. This quick response is vital in HVAC networks to prevent backflow and mitigate water hammer shockwaves, protecting manifolds, zone pumps, and pressure gauges from system damage.
Standard brass alloys can lose zinc over time when exposed to oxygenated water, a process called dezincification that weakens the metal structure. Dezincification-Resistant (DZR) brass is alloyed with specialized elements like arsenic or bismuth, protecting the valve from corrosion and maintaining its strength in demanding domestic and industrial applications.
Cracking pressure is the minimum upstream pressure required to open the valve disc. In low-pressure heating loops, choosing a valve with a high cracking pressure forces circulation pumps to work harder, increasing energy use. We calibrate our spring tensions to minimize cracking pressure while ensuring reliable, tight sealing on backflow.
For North American plumbing networks, look for NSF/ANSI 61 and UPC listings to confirm lead-free compliance. For European markets, look for CE markings, WRAS approval, and ISO 9001:2015 certification. These standards verify that the manufacturer maintains consistent quality controls and uses food-safe materials.
Our quality control starts at raw material inspection, using spectrometers to verify the chemical makeup of every melt. After precision machining on CNC systems, every valve goes through automated pneumatic and hydrostatic testing. This double-testing process ensures that only 100% leak-free components leave our facility.
Explore our high-performance brass gate valves, automated mixing units, and localized thermostat controls engineered for precision systems.
Direct sourcing options for highly requested configurations including mixing valves, temperature control manifolds, and security fittings.
Combines reliable shut-off capability with an internal screen to catch pipeline debris in a single compact housing.
Provides manual adjustability over temperature flow ranges, keeping heating systems working efficiently.
Maintains temperature control in hydronic manifolds by mixing system supply water with cool return flow.
Offers reliable distribution pathways to individual rooms or heating zones for precise system balancing.
Features heavy-duty brass construction for outdoor connections and reliable washdown service.
Designed to isolate supply lines with minimal pressure drop when fully open.
Provides sturdy, accurately dimensioned connection points for commercial and residential water meters.
Engineered to US standard barb sizes, ensuring tight connections on flexible tubing and PEX pipe.
Contact our engineering department for assistance with custom shapes, threads, or special designs.
Inquire NowBrass forged piston pressure reducing valves designed for line pressure safety.
External thread hose tap brass safety water stop valves.
Precision-machined bib tap configuration for utility lines.
Water Kraan standard fittings for general plumbing networks.
Pressure relief flow control ball valves for system safety.
Male with lock sanitary ball valves for secure installations.
Female thread gate valve configurations for inline isolation.
Corrosion-resistant brass T strainer and check valve units.
Provides debris filtration to protect sensitive downstream equipment.
Vertical spring-loaded check valve equipped with a brass mesh filter.
Manual internal thread straight through one-way check valve.
Brass pump mixing valve unit for heating loop automation.
Maintains temperature control for hydronic underfloor heating loops.
Designed for residential heating systems utilizing hydronic manifolds.
Brass air vent valve group for balancing loop pressures.
Manual air vent plug configuration for line maintenance.
Adjustable automatic air release valve designed for hydronic systems.
Air removal vents designed for boiler loops and central heating systems.
End unit accessory tail fitting for exhaust and water discharge.
High-durability brass compression connections optimized for PE pipes.
Standard thread connections for plumbing and heating distribution lines.
