Yongda
Yongda
Explore our high-performance line of engineered fluid control valves, actuators, and brass fittings manufactured for global HVAC and plumbing applications.
Understanding the mechanical, thermodynamic, and automated parameters driving modern fluid control networks.
In modern industrial fluid networks, high-performance HVAC loops, and automated municipal water delivery systems, the control of reverse flow is critical. While traditional mechanical swing and spring-loaded check valves rely purely on differential pressure to operate, the global industrial landscape is rapidly transitioning toward electric check valve technology and motorized backflow prevention systems. As premier electric check valve exporters, we engineer solutions that eliminate water hammer, minimize pressure drops, and integrate seamlessly into Building Management Systems (BMS) and IoT-driven smart networks.
Key Engineering Advantage: Electric check valves combine motorized actuation with high-precision internal sealing, offering zero back-leakage, programmable stroke timing, and automated power-loss closing functions that protect downstream high-pressure pumps and boilers.
When high-capacity pumps shut down abruptly, sudden pressure surges—commonly known as water hammer—can cause catastrophic pipe ruptures, pump impeller degradation, and severe noise pollution. Electric check valves resolve this by synchronizing motor speed with system pressure drops. By utilizing programmable electric actuators coupled with micro-controlled disc mechanisms, these valves close at a controlled rate right before backflow velocity peaks, completely dampening hydraulic shock waves.
Depending on the system scale, modern commercial plumbing and underfloor heating networks deploy two primary types of automated flow control: electro-thermal actuators and motorized servo gear actuators. Electro-thermal actuators, widely used in radiant floor manifolds, utilize wax expansion elements heated by low-voltage electrical signals to provide noiseless, highly reliable on/off flow regulation. Motorized gear actuators offer rapid response, micro-stepping accuracy, and feedback signal outputs (0-10V or 4-20mA) for precise proportional control in variable-flow chilled and hot water lines.
Fully compatible with Modbus, BACnet, and IoT protocols. Provides real-time valve position feedback, temperature metrics, and remote diagnostic data.
Equipped with internal supercapacitors or mechanical spring-return backups to ensure 100% leak-tight closure during sudden power loss events.
High-grade EPDM and FKM elastomeric seats combined with precision-machined brass and stainless steel discs guarantee ISO 5208 Rate A tightness.
Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) was founded in 1996 and is located in the world-renowned "China Valve Capital" — Yuhuan, Zhejiang. As an industry pioneer, we specialize in the comprehensive design, thermal development, precision forging, and global distribution of high-grade brass valves, smart actuators, and HVAC system components.
Our premium product portfolio is built across three primary core lines: heavy-duty brass valves, engineered pipe fittings, and smart HVAC temperature control products. Highlighting our environmental protection commitment, our items are favored by top-tier engineering contractors and distributors across North America, Europe, and Asia-Pacific markets.
Our upgraded brand, Cokaren, operates under the core promise: "Keep flowing, keep warming"—delivering sophisticated aesthetic designs, extended duty cycles, and exceptional heating and fluid control efficiency for global smart homes and commercial facilities.
Unmatched raw material sourcing, automated hot-forging capability, and rigorous ISO quality assurance.
Operating in Yuhuan gives us access to a complete supply chain matrix—ranging from raw brass ingot refining to precision CNC machining, surface nickel-plating, dynamic balancing, and automated pressure testing. This localized industrial ecosystem drastically reduces manufacturing lead times and allows us to deliver ultra-competitive pricing without compromising structural integrity.
We strictly control material chemistry. Our electric check valves and brass bodies are forged using CW617N, CW602N (DZR - Dezincification Resistant Brass), and C37700 lead-free alloys. Every batch of brass undergoes spectral analysis to comply with European EN 12165 standards and North American NSF/ANSI 61 drinking water safety criteria.
Precision is essential for automated valves. Our production floor houses over 600 sets of advanced machinery, including 80+ multi-axis specialized machine tools that execute thread cutting, valve seat finishing, and actuator housing alignment within micron-level tolerances. This guarantees zero binding during electric motor operation.
Adhering strictly to our quality policy of "Fine work, no leakage," 100% of manufactured valves are subjected to multi-stage pressure testing—including shell hydrostatic tests at 1.5x nominal pressure and seat air bubble tests at low and high pressures prior to shipment.
Cokaren, as an innovative flagship brand of Yuhuan Yongda, represents our commitment to delivering refined aesthetics, ergonomic installation, and long-term operating efficiency.
We strive to harmonize corporate growth with employee welfare, fostering a culture of continuous improvement that elevates China's high-end valve manufacturing capabilities on the global stage.
Delivering heavy-duty performance across commercial HVAC, smart residential heating, and industrial process control networks.
Electric check valves and motorized mixing units regulate water distribution in multi-story office buildings and hotels, balancing differential pressure while stopping reverse siphonage across multi-chiller headers.
Integrated with brass distribution manifolds, thermal actuators precisely open and close individual floor loop circuits based on smart room thermostat feedback, maintaining optimal thermal comfort.
High-temperature brass safety check valves and boiler angle valves prevent backpressure contamination in high-temperature domestic hot water tanks and industrial steam generation equipment.
Yuhuan Yongda operates under rigid international management frameworks to ensure that every electric valve, fitting, and manifold leaving our factory meets the demanding standards of global engineering contractors.
Our products comply with CE, RoHS, and NSF standards, allowing seamless importation into North America, the European Union, the Middle East, and Southeast Asia.
Essential engineering checklist for procurement managers, OEMs, and mechanical system integrators.
Verify whether your system requires 24V AC/DC, 110V AC, or 230V AC power input. Select between 2-wire auto-return, 3-wire floating control, or 0-10V modulating signals.
Ensure the valve size provides an adequate flow coefficient (Kv) to prevent excessive pressure drops across boiler headers and distribution pumps.
For moist mechanical rooms or outdoor installations, specify NEMA 4X or IP65/IP67 rated actuator enclosures to prevent moisture ingress and internal motor shorting.
Utilize our OEM services for customized thread standards (NPT, BSPP, BSPT), custom body branding, color-coded actuator shells, and tailored packaging.
In-depth engineering answers regarding electric check valve performance, installation, and maintenance.
A standard mechanical check valve relies strictly on fluid pressure differential to push open a disc or swing gate. An electric check valve uses an integrated electric motor or thermal actuator to actively open and close the internal mechanism. This provides automated remote control via smart thermostats or BMS, prevents water hammer through synchronized closing times, and ensures zero leakage regardless of fluid backpressure.
Thermal actuators contain a PTC heating element and a wax expansion cartridge. When a 24V or 230V signal is applied from a room thermostat, the PTC element heats the wax, causing it to expand and push down the valve stem to open or close the circuit loop. Thermal actuators operate silently, draw very little power (~2W), and have no mechanical gears to wear out.
Our electric check valves offer optional failsafe configurations. Depending on your engineering specification, you can choose "Normally Closed" (NC), "Normally Open" (NO), or capacitor-buffered fail-safe models. In fail-safe configurations, an internal supercapacitor or mechanical spring immediately drives the valve to its fully closed position upon sensing power loss, safeguarding upstream equipment from reverse flow damage.
CW617N is the European standard hot-forging brass alloy (CuZn40Pb2). It exhibits exceptional tensile strength, excellent resistance to stress corrosion cracking, and high machinability. It allows us to forge complex, thin-walled valve bodies capable of withstanding PN16/PN25 working pressures while preserving smooth internal flow channels.
Yes. With over 45,000 square meters of production space, 600+ testing and manufacturing tools, and nearly 30 years of forging experience, we regularly manufacture OEM and ODM fluid control components for leading brands across Europe, North America, and the Middle East. We provide full support from 3D CAD design and mold creation to custom laser etching and packaging.
Every valve line undergoes 100% factory inspection. This includes shell pressure tests at 1.5x PN rating, high/low pressure pneumatic seating leakage tests, actuator cycle testing under voltage fluctuations, and dimensional verification via coordinate measuring machines (CMM).
Complete your hydronic installation with high-precision digital room thermostats, brass manifolds, and auto-air vent components.
