Yongda
Yongda
In high-integrity municipal, commercial, and residential water delivery networks, public health and system reliability hinge upon absolute backflow prevention. As a premier OEM Double Check Valve Manufacturer, we design systems that strictly address the physical forces of backflow, which manifest through two key hydrodynamic phenomena: Backsiphonage and Backpressure.
Inlet pressure exceeds cracking threshold, compressing spring 1 and 2 to permit unobstructed passage.
As downstream dynamic head matches inlet, internal heavy-duty springs auto-close poppets to seal lines.
If check 1 experiences particulate obstruction, independent check 2 acts as a complete secondary block.
Our heavy-duty double check valves comprise two independent, spring-loaded internal check valve mechanisms housed within a single, corrosion-resistant brass body structure. This redundant configuration ensures that if one seal is compromised by particulate scaling or localized wear, the second assembly continues to prevent fluid migration. By utilizing premium elastomer disc seals (such as EPDM and high-temp Viton) matched with precision-wound stainless steel springs, we guarantee a low pressure drop (high Cv coefficient) and precise cracking pressures ranging between 0.5 to 1.5 PSI.
Established in 1996 in the renowned "China Valve Capital" – Yuhuan, Zhejiang, Yuhuan Yongda Fluid Control Co., Ltd. has developed into a dominant manufacturer in the global plumbing, HVAC, and industrial valve sectors. Our core manufacturing capabilities focus on three highly engineered categories: brass valves, precision brass fittings, and commercial HVAC equipment.
We target the mid-to-high-grade international market segment, placing heavy emphasis on lead-free materials, sustainable manufacturing, and structural longevity. Our products are widely distributed to over 20 countries, establishing a deep market footprint across North America and Western Europe.
Our expansive industrial park has a total land area exceeding 45,000 square meters, with actual usable workshop floors reaching 80,000 square meters. The plant integrates vertical integration models, hosting 600+ sets of high-precision manufacturing systems, including 80+ dedicated multi-axis CNC machining tools, automatic forging machines, spectrometer analysis equipment, and state-of-the-art hydraulic cycle testing rigs.
Cokaren represents our commitment to sophisticated aesthetics and high-performance fluid control. Guided by the brand promise of "keep flowing, keep warming", Cokaren concentrates on developing premium residential plumbing components and underfloor heating valves that maximize thermodynamic efficiency and maintain structural stability over decades.
Cokaren's strategic roadmap centers on utilizing premium copper-based alloys and smart electronics to support the transition toward modern hydronic and potable water architectures.
Procurement departments for international municipal water authorites and global HVAC system integrators face escalating complexities in material sourcing. We address these challenges with targeted, industrial-grade solutions:
North American NSF/ANSI 61 and 372 standards require potable water components to contain less than 0.25% lead. We utilize customized C46500 and CW511L lead-free brass alloys, verifying composition with on-site optical emission spectrometers.
Poorly optimized internal geometries restrict flow, increasing pump loads and energy consumption. Our double check valves feature computer-modeled flow pathways to maximize flow rates and minimize pressure drop.
High velocity transitions often cause rapid localized cavitation, leading to seal failure. We utilize high-spec NBR, EPDM, and fluorocarbon seating to ensure continuous operation over 150,000 test cycles.
Additionally, modern building regulations encourage integrated safety systems. Dual check check valves are increasingly embedded in pre-assembled utility manifold boxes to streamline installation and reduce leak risk in modular construction projects.
Quality assurance forms the backbone of Yuhuan Yongda. Our operational core is built on a clear set of principles:
Our quality target is simple: "Fine work, zero leakage." Each check valve assembly undergoes 100% pneumatic sealing tests and hydrostatic pressure tests at 1.5 times the maximum rated working pressure prior to packaging. This rigorous testing minimizes assembly issues in the field.
Beyond production, we foster a collaborative culture that aligns corporate growth with the professional development of our over 600 skilled technicians.
Our production facilities operate under ISO 9001:2015 Quality Management Systems, ISO 14001:2015 Environmental Management Systems, and ISO 45001:2018 Occupational Health and Safety standards. This certification framework ensures material traceability, safe working conditions, and consistent manufacturing quality.
Beyond double check valves, we manufacture a wide selection of HVAC, potable water, and district heating solutions. Our systems are designed to optimize fluid dynamics and temperature control.
Protects plumbing systems by filtering up to 98% of line particulate matter.
Features a chrome-plated brass spherical spool to regulate boiler cold and hot water inlets.
Automatically discharges trapped air from air-source heat pumps to prevent air lock issues.
Blends hot supply and cold return lines to stabilize floor heating temperatures and protect pipe systems.
Electronic thermostat module that coordinates manifolds and valves to maintain set temperatures.
Filters and vents impurities, controls manifold loops, and measures temperature and system pressure.
Distributes water flow to individual rooms while accommodating zone valves and actuators for precise underfloor heating management.
To support next-generation plumbing infrastructure, our R&D division focuses on three main developments:
Standard brass can experience dezincification in aggressive water conditions. We are expanding production of high-performance DZR (Dezincification Resistant) and silicon-bronze alloys to ensure longevity in challenging environments.
We are developing testable double check valve assemblies featuring integrated pressure differential sensors. These sensors alert maintenance teams via Building Management Systems (BMS) when a check component requires servicing.
Using advanced Computational Fluid Dynamics (CFD) software, we simulate internal flow dynamics. This modeling helps minimize turbulence and reduces pressure loss down to historical lows.
