Yongda
Yongda
High-durability materials engineered to exceed critical standards across international piping and heating installations.
Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) was founded in 1996. Nestled in the heart of "China's Valve Capital" – Yuhuan, Zhejiang, our enterprise has grown to become a cornerstone of the global plumbing and heating sector, focusing on the rigorous design, development, production, and exporting of high-grade HVAC solutions and check valves.
Our expansive product catalog spans three primary disciplines: premium brass valves, specialized fittings, and integrated HVAC products. Each product line is meticulously positioned at the mid-to-high-end tier, ensuring unmatched longevity, exact flow coefficient (Cv) ratings, and a strong adherence to lead-free/environmental specifications demanded in North America and the European Union.
Operating from a massive factory facility spanning over 45,000 square meters (with actual utilization space reaching 80,000 square meters), we have equipped our production floors with over 600 sets of advanced manufacturing and testing devices, including 80+ high-precision specialized CNC machine tools. This robust machinery pool enables us to adapt to bespoke OEM/ODM requirements seamlessly, exporting high-performance fluid control mechanisms to more than 20 countries worldwide.
To better serve the evolving premium HVAC sector, we established Cokaren. Cokaren is dedicated to designing hydronic products with refined aesthetics, uncompromising quality, and intelligent thermal regulation parameters. Our core brand promise, "keep flowing, keep warming," reflects our dedication to creating zero-leakage, low-friction water system components that guarantee home comfort and energy efficiency.
Through Cokaren, we utilize advanced raw material formulations, custom surface treatments (such as premium electroplating and nickel coatings), and strict tolerance monitoring to supply components capable of integration into modern Smart Home ecosystems.
Adhering to strict international operational guidelines to provide reliable supply chains for critical industrial operations.
Our operational mantra is defined by "Fine work, no leakage." We focus on manufacturing processes that minimize micro-porosity in forged brass, utilizing multi-stage helium testing and hydraulic pressure rigs to verify bubble-tight sealing on every run. Our organizational culture centers on being "Struggle-driven, Enterprising, Pragmatic, and Innovative," keeping customer-oriented engineering at the forefront of our operations.
We operate under three primary ISO management frameworks to maintain strict control over quality, safety, and environmental impact:
A complete breakdown of our engineering solutions designed to manage pressure dynamics, control direction, and protect system integrity.
Energy distribution networks require precise regulation of pressure differentials, thermal stratification, and directional flow control. Yongda designs and manufactures the essential nodes within these systems to reduce heat loss, eliminate cavitation, and prevent back-siphonage in municipal, industrial, and high-end residential applications.
The first line of defense in domestic water sanitation, filtering 98% of physical impurities and particulate debris in the pipeline.
Controls cold and hot water cycles in high-pressure boilers, featuring a spherical spool designed for low-torque, leak-free isolation.
Automatically discharges entrapped air pocket build-ups in heat pumps and boiler lines to prevent heat locks and air binding.
Balances hot and cold water streams to stabilize temperature variables, preventing thermal shocks and protecting downstream piping.
Integrates with manifold actuators for digital zone-by-zone microclimate monitoring and control.
A multi-functional module designed to filter particulates, discharge air, isolate flows, and display water pressure/temp analytics.
High-capacity distribution manifold system that splits primary loops into multiple hydronic circuits with independent balance valves.
Exploring the mechanical developments in zero-leakage, low-cracking check valve technologies for industrial vacuum isolation.
Vacuum check valves are crucial safety components in modern piping networks. Unlike standard one-way valves, vacuum check valves must prevent reverse flow under micro-pressure differentials and maintain a tight seal under high vacuum levels. Our engineering team has identified three critical areas driving our current and future R&D initiatives:
Traditional EPDM seals can degrade under chemical exposure and temperature extremes. We are shifting toward high-grade Fluorocarbon (FKM) and Hydrogenated Nitrile (HNBR) polymers. These materials provide superior sealing recovery and resistance to degradation down to 10-6 mbar, ensuring sealing performance is maintained over time.
For vacuum systems, minimizing flow restriction is essential. Our custom check valves utilize calibrated, stress-relieved Stainless Steel 316 springs. These springs are designed to achieve a low cracking pressure (as low as 0.02 bar) while still ensuring rapid, positive shut-off when reverse flow occurs.
Looking forward, we are developing prototypes for smart non-return valves. By integrating micro-differential pressure sensors and Bluetooth transmitters into the valve body, operators can monitor sealing wear and flow issues in real-time, enabling predictive maintenance.
Engineering Insight: Choosing between a swing check design and a spring-loaded lift check design is critical. For vacuum line isolation, spring-loaded check valves are typically preferred because they can be installed in any orientation and close quickly, minimizing backflow before a vacuum loss can affect upstream equipment.
How vacuum check valves and brass flow regulators protect municipal infrastructure, commercial HVAC, and automation systems.
In multi-story commercial hydronic systems, pressure drops can lead to sub-atmospheric zones, causing air leaks and pump cavitation. Installing high-precision venting valves alongside non-return check valves maintains positive loop pressure, ensuring heat transfer efficiency remains stable.
Cross-contamination of potable water is a major safety risk. Our double-check backflow preventers and inline filters protect municipal feed lines from back-siphonage due to unexpected drops in main supply pressure, meeting strict environmental health codes.
Pneumatic picking machinery and automated assembly systems rely on stable vacuum pressures. Our specialized ODM check valves maintain vacuum isolation when pumps are turned off, preventing parts from dropping and reducing compressed air consumption.
High-volume manufacturing requires a balance of speed, precision, and cost-efficiency. At our facility in Yuhuan, we utilize a vertical manufacturing model that controls every phase of production, from raw brass billet chemistry to final packaging.
Hot Forging Automation: Our automated forging lines produce dense metal structures with minimal internal stress, preventing the micro-porosity defects common in cast valves.
Strict Testing Protocols: Every production lot undergoes spectrometer analysis to verify metal composition, combined with coordinate-measuring machine (CMM) dimensional checks and underwater bubble testing at 1.5 times the rated working pressure. This rigorous quality control ensures reliable valve performance in the field.
Strategic Location: Situated in Zhejiang, we have direct access to deep-water ports in Ningbo and Shanghai. This proximity, combined with local raw material sourcing, allows us to offer shorter lead times and reliable shipping schedules to our global clients.
Key technical considerations for procurement managers, engineering firms, and regional distributors.
Purchasing components for complex fluid systems requires detailed evaluation of technical parameters to ensure long-term compatibility. When sourcing vacuum check valves, we recommend evaluating the following design elements:
Different regional markets require specific thread profiles to prevent system leaks. We manufacture products to match BSPT, BSPP, NPT, and metric standards, as well as specialized solder, compression, and ASTM F1807 PEX crimp designs for residential installations.
Potable water systems in acidic or high-chloride environments can experience zinc leaching in standard brass. We utilize verified lead-free DZR brass alloys (such as CW602N) to prevent corrosion, complying with NSF/ANSI 61 and California AB1953 lead-free mandates.
Ensuring our components meet global safety, environmental, and import certification standards.
We maintain a comprehensive certification portfolio. Our products carry CE marks, RoHS compliance certificates, and undergo testing to confirm adherence to WRAS, NSF, and ASME specifications.
We support global supply chains with custom retail packaging, multi-lingual installation manuals, barcode labeling, and direct-to-warehouse shipping solutions.
Our engineering department provides 2D/3D CAD drawings (STEP, DWG formats) and prototype testing, streamlining the validation process for system integration.
Direct engineering answers to common technical and logistical questions from our industrial partners.
Explore our range of compression fittings, actuator models, and heating system accessories.
