Yongda
Yongda
In commercial and residential swimming pool filtration systems, the check valve acts as the absolute baseline defender of hydrodynamic integrity. These valves prevent the reverse flow of water, safeguarding sensitive equipment such as chlorinators, gas heaters, and solar heating panels from chemical backwash and water hammer pressures. However, selecting a high-performance check valve requires a deep understanding of structural compliance and metallurgical integrity.
The CE Certification (Conformité Européenne) is not just a regulatory stamp; it is a declaration that the check valve meets rigorous European health, safety, and environmental protection standards. For pool applications, check valves must withstand continuous exposure to chemical additives (chlorine, bromine, ozone) and variable backwash forces. Under the Pressure Equipment Directive (PED) 2014/68/EU, CE-certified valves are thoroughly tested for minimum cracking pressure, shell integrity, and seal seat tightness.
By specifying CE-certified brass and bronze components, global engineering companies and procurement departments ensure they are installing valves that exhibit zero seat leakage under standard test pressures (EN 12266-1). This level of safety prevents the drainage of pool pumps, ensuring the suction lines remain fully primed, minimizing cavitation risk, and extending pump service life.
Established in 1996 and located in Yuhuan, Zhejiang—celebrated as the "China Valve Capital"—Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) has evolved into an industry-leading manufacturer specializing in fluid control systems. With more than 28 years of practical field engineering experience, we focus on the design, development, production, and distribution of medium-to-high grade brass valves, fittings, and HVAC products.
Our state-of-the-art production complex extends across an expansive factory area of more than 45,000 square meters, providing a functional working footprint exceeding 80,000 square meters. The plant integrates vertical production flows from raw material forging to high-precision machining, finishing, and ultimate quality-assurance testing. We cater directly to the high-demand markets of North America, Europe, and Asia.
To reinforce our dedication to innovation and unmatched design aesthetics, we introduced our premier brand, Cokaren. Driven by the brand promise of "keep flowing, keep warming," Cokaren represents refined appearance and unparalleled longevity in water distribution and HVAC accessories, pushing our corporate vision to become a world-class brand.
Operating within the heart of Yuhuan allows us to source raw materials, tooling components, and surface-treatment services in immediate physical proximity. This industrial concentration minimizes logistics friction, accelerates custom prototype development, and ensures highly competitive cost structures.
Our factories utilize certified eco-friendly alloys, including CW617N, DZR (Dezincification Resistant) brass, and lead-free copper alloys compliant with European REACH/RoHS and North American NSF/ANSI 372 standards. This protects aquatic biomes and humans from harmful metal leaching.
With over 600 sets of advanced testing and manufacturing hardware, including computerized optical emission spectrometers, automated shell-integrity air tests, and hydraulic life-cycle fatigue counters, we ensure that the "fine work, no leakage" policy is applied to every valve.
High-capacity filtration systems require check valves with large coefficient-of-flow (Cv) values to optimize pump output and save energy. Our spring-loaded check valves provide rapid closure and low flow resistance, making them ideal for high-rate sand filter systems and chemical injection backflow isolation.
Check valves prevent gravity circulation (thermosiphoning) during off-sun hours in solar pool heating loops. Utilizing high-temperature resistant O-rings (Viton or EPDM) and high-grade spring components, our check valves retain seal integrity under continuous thermal cycling up to 120°C.
Our corrosion-resistant brass and anti-corrosion tap elements handle low-concentration acid-base effluents, sludge processing, and chemical dosing pumps. The self-cleaning design of the internal shuttle prevents particulate blockages.
At Yuhuan Yongda, we operate under a rigorous set of core values designed to align customer success with our operational excellence:
We actively invest in improving employee welfare and training, ensuring our technical workforce is equipped to manage precision CNC stations and automated testing cells. By achieving ISO9001:2015, ISO14001:2015, and ISO45001:2018 certifications, we ensure that safety, environmental protection, and quality are integrated into our daily operations.
Explore our system integration components that complement pool check valves and hydraulic systems.
Proper fluid design requires balancing temperatures, venting trapped gases, and straining out particulates. Our engineering team designs entire manifolds and balancing groups that ensure check valves perform optimally in high-pressure loops.
The first line of defense in domestic water sanitation, filtering 98% of impurities in the pipeline to protect downstream check valves.
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Used to control the inflow and outflow of water in boilers, featuring a high-precision spherical spool for tight shutoffs.
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Discharges excess air in heat pump and water heating loops, stabilizing thermal transfer rates.
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Blends cold and hot fluids dynamically, preventing temperature shock in plumbing systems.
Learn More →Globally, drinking water regulations are shifting toward zero-lead allowances. Manufacturers are transitioning from traditional leaded brass to silicon-bronze and copper alloys to comply with upcoming drinking water directives.
Valves are increasingly featuring digital monitoring capabilities. By integrating pressure-differential and flow-rate micro-sensors directly into the valve body, commercial operations can detect check valve seat wear prior to backflow failures.
Utilizing Computational Fluid Dynamics (CFD), designers are molding valve internals to reduce turbulence. A lower pressure drop reduces energy consumption at the pump, supporting green building certifications like LEED.
CE certification under the PED (Pressure Equipment Directive) verifies that the valve body design, wall thickness, and seals can safely handle maximum rated system pressures. Without this certification, commercial project operators face structural liability and regulatory compliance issues.
While plastic check valves are common, high-grade DZR brass and bronze check valves provide significantly higher structural strength, thread integrity, and UV resistance. For high-pressure solar plumbing lines or commercial facilities subject to vibration and high temperatures, brass check valves resist failure and cracking far better than PVC alternatives.
Cracking pressure is the minimum upstream pressure required to open the valve disc and allow flow. If the cracking pressure is too high, the pool pump must work harder, reducing overall system efficiency and flow rate. Yongda's check valves are optimized with light-tension, high-fatigue springs to ensure positive sealing with minimal cracking pressure.
The primary causes of failure are seal degradation due to aggressive chemical exposure (such as high chlorine levels) and scale buildup blocking the disc guide. We prevent these issues by utilizing chemical-resistant EPDM or Viton seals and high-precision CNC guides that prevent alignment deviation over millions of cycles.
Yes, our spring-loaded inline check valves can be mounted in both horizontal and vertical positions. The internal spring ensures the valve closes immediately when flow stops, regardless of gravity direction, which prevents the line from draining back.
