Yongda
Yongda
The industrial fluid control landscape is transitioning from passive mechanical pressure relief to intelligent, system-integrated safety solutions. As global clean energy systems, smart grid infrastructure, and high-efficiency hydronic architectures expand, safety and pressure relief valve technologies must continuously evolve. Our long-term technical roadmap addresses critical mechanical engineering challenges, environmental demands, and smart building integration.
Next-generation pressure relief systems integrate micro-sensors to monitor cracking pressure cycles and spring fatigue. Real-time telemetry notifies building automation platforms of minor seal degradations before system-wide failures occur, minimizing water damage risk.
Aggressive potable water chemistry demands advanced metallurgy. Our materials research roadmap focuses on high-purity lead-free brass (e.g., CW724R, C46500) and bismuth-doped alloys, offering exceptional resistance to stress corrosion cracking and dezincification.
Utilizing high-performance elastomer membranes (EPDM, Viton) paired with precision-lapped metal seats, we achieve zero bubble-tight leakage. This guarantees long-term sealing stability even under high pressure-temperature cycles in closed-loop solar thermal systems.
Overpressure protection is critical for heating, ventilation, air conditioning (HVAC), and domestic hot water systems. A faulty safety valve can lead to systemic failures, boiler explosions, or ruptured manifolds. We provide tailored flow control solutions across major commercial and residential sectors:
Modern boilers run at high temperatures and pressures to maximize energy efficiency. Our safety groups, automatic air vents, and mixing shunts work together to keep heat distribution networks running safely. They protect expansion vessels, eliminate air locks, and prevent overpressure spikes in closed-loop systems.
Underfloor heating systems require precise pressure balancing and zoning. Our brass manifolds, combined with integrated bypass loops, automatic vents, and differential pressure valves, ensure balanced flow and pressure distribution across all rooms, keeping pipe systems safe.
Founded in 1996, Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) is located in Yuhuan, Zhejiang—widely recognized as the "China valve capital." As a leading name in the plumbing valve sector, the company focuses on product design, development, production, and sales.
Our core products include brass valves, fittings, and HVAC systems. Positioned in the middle and high-grade bracket, our products highlight environmental safety, making them highly favored by consumers in North America, Europe, and other global markets.
Our new brand, Cokaren, represents our focus on refined appearance, advanced engineering, and excellent service. Grounded in our brand promise—"keep flowing, keep warming"—we design our water system components to bring comfort, security, and reliability to homes worldwide.
At Yuhuan Yongda Fluid Control, our values shape everything we do:
We focus on developing company capability and motivation, improving employee welfare, and aligning corporate growth with personal happiness.
Quality and safety require strict adherence to international standards. Yongda has established a comprehensive quality, safety, and environmental management framework, backed by key certifications:
Every component in an energy distribution network plays a vital role. From filtration to automatic venting, we deliver high-performance solutions for residential and commercial heating and water installations:
The first line of defense in domestic water sanitation, filtering 98% of sediment and impurities to protect downstream pipes, valves, and appliances.
Designed to control cold and hot water inflow/outflow in heating boilers. Features a spherical spool for smooth operation and durable sealing.
Designed to discharge excess air in water heating systems, preventing air locks, reducing system noise, and ensuring stable heating operation.
Mixes hot and cold water to deliver a stable outlet temperature, preventing scalding and protecting floor heating pipes from thermal damage.
Integrates with heating systems to provide precise room temperature adjustments, lowering energy consumption through smart scheduling.
Filters and discharges system impurities while controlling manifold flow. Built-in gauges support real-time pressure and temperature checks.
Distributes heating fluid efficiently across different room zones. Combines with smart controls for optimal regional climate settings.
Yongda operates in Yuhuan, Zhejiang—China's valve manufacturing capital. This local ecosystem connects us directly to raw material suppliers, specialized tooling workshops, and logistics hubs. We pass these efficiency advantages on to our customers through resilient timelines, high product consistency, and competitive pricing.
Our facility spans a 45,000 m² footprint (with over 80,000 m² of usable floor space). Equipped with over 600 advanced manufacturing and testing systems, including 80+ specialized CNC machining stations, we control the entire production cycle in-house. From raw brass extrusion and forging to assembly and testing, we eliminate external delays.
Mitigating Raw Material Volatility: Copper market prices fluctuate constantly. To protect clients from sudden cost spikes, we employ proactive inventory sourcing and hedging. Combined with automated forging lines that minimize scrap, we maintain price stability even during global supply shifts.
Supporting global markets requires strict compliance with international mechanical, plumbing, and material standards. Whether you are an industrial distributor, HVAC contractor, or OEM brand, we provide detailed technical support and verification at every stage of production.
Every safety valve undergoes comprehensive validation before shipping. This includes automated pneumatic pressure calibration, structural hydrostatic testing, and seat leakage checks. We ensure zero leakage and precise set-point cracking pressures.
We configure connection threads (NPT, BSPP, BSPT), custom relief pressures (from 1.5 to 10 bar), and specific body shapes. Our branding services include custom laser marking, color-coded handles, and custom safety group layouts.
We trace every production run back to its raw material heat code. This tracking covers alloy composition analyses, forging pressure parameters, and post-assembly quality reports, ensuring consistent quality for critical projects.
A safety valve opens rapidly and fully ("pops") when pressure exceeds the set limit, commonly used in steam or vapor applications. A relief valve opens gradually, in proportion to the overpressure, typically used for liquid systems like water heaters or fluid heat exchangers.
Dezincification-Resistant (DZR) brass prevents selective leaching of zinc when exposed to hard or oxygen-rich water. This maintains the structural integrity of the valve body and prevents pinhole leaks or thread failures over time.
Dissolved air in heat-transfer fluids forms air pockets that restrict flow, reduce heat exchange efficiency, and cause pump cavitation. Automatic venting valves release this air continuously without manual system draining.
We recommend testing safety valves manually at least once a year by lifting the lever to clear sediment. For commercial installations, follow local mechanical codes, which typically require annual inspections and replacements every 3–5 years.
Yes. We customize set relief pressures (e.g., 1.5, 3.0, 6.0, or 8.0 bar) to meet the design specifications of your boiler or solar thermal loop. All settings are laser-etched onto the valve body.
Yes, our PEX crimp fittings conform to ASTM F1807 guidelines. This compatibility makes them suitable for residential PEX pipe connections in North American and European plumbing networks.
