Yongda
Yongda
Within global water systems and HVAC regulation, precision engineered ball cock balls serve as critical mechanical actuators for automatic float level controls. Traditionally made of high-grade copper or advanced lead-free brass formulations, these spherical floats control inlet valves based on shifting liquid levels. Modern industry demands strict mechanical reliability, chemical anti-corrosion properties, and dimensional stability under thermal loads.
As a leading exporter and OEM manufacturer, we design and produce components that prevent water hammer, resist cavitation, and maintain dimensional tolerances. This ensures consistent performance throughout operational life cycles exceeding 100,000 actuations. This engineering document outlines details regarding supply chain reliability, metallurgic specifications, regulatory compliance, and installation paradigms.
Yuhuan Yongda fluid control Co., Ltd. (formerly Yuhuan Yongda plumbing Co., Ltd.) was founded in 1996, and is located in "China valve capital" – Yuhuan, Zhejiang. As one of the professional plumbing valve enterprises, we focus on product design, development, production, and sales.
Our products are mainly divided into three categories: brass valves, fittings, and HVAC products. Positioned in the middle and high grade, our designs emphasize environmental protection and are widely favored by consumers in North America, Europe, and other global markets.
With a factory footprint of more than 45,000 square meters and actual usable space reaching 80,000 square meters, our facility houses more than 600 sets of advanced production and testing equipment. This includes over 80 sets of specialized machine tools to meet the custom needs of our international clientele. Today, we proudly export our fluid control solutions to more than 20 countries.
Cokaren, a specialized brand of Yuhuan Yongda Fluid Control Co., Ltd., is committed to developing products with high-quality finishes and tight tolerances to provide excellent service to global customers.
Cokaren's brand promise is "keep flowing, keep warming". Our design team focuses on engineering water system accessories that bring comfort and reliability to residential and commercial environments alike.
Cokaren implements an dynamic corporate strategy, focusing on consistent growth to establish itself as a recognized brand in international fluid control systems.
Operating out of Yuhuan, the valve manufacturing center of China, allows us to deliver cost-effective and reliable products for major global buyers.
Located in Zhejiang, we have direct access to raw materials, stamping shops, tooling designers, and plating facilities. This integrated supply chain reduces turnaround times and keeps costs competitive.
We work with standardized lead-free brass formulations, CW617N, and DZR brass, checking batch chemistries via spectrometer testing to confirm compliance with global standards.
With over 600 sets of advanced production and testing equipment, we minimize manual variances to ensure dimensional stability and leak-proof performance across large product runs.
Culture: Struggle, Enterprising, Pragmatic, Innovative
Tenet: Customer first, Quality based
Quality Policy: Fine work, no leakage
We strive to develop the company's capability and motivation, continuously improve the income and welfare of employees, and seek the agreement between company development and personal happiness.
Our commitment to reliable design is verified by internationally recognized certifications. The company has passed:
Serving over 20 countries requires compliance with various regional plumbing regulations and technical standards. We provide OEM and ODM partners with engineering support and compliance verification:
We supply low-lead and lead-free brass components compliant with NSF/ANSI 61 and NSF 372 requirements for potable drinking water systems, alongside NPT thread configurations.
Our products comply with EN standards and use CE-marked raw materials (such as CW617N and CW614N brass alloys), featuring BSPP/BSPT thread sizing for compatibility with European systems.
Every product batch undergoes pressure cycle testing, dimensional inspection, and structural checks to verify leak-free performance before shipping.
Integrating control systems, thermal actuators, manifolds, and filtering elements to optimize domestic heating and water distribution.
Integrates fluid balancing to stabilize local plumbing pressure gradients.
Controls flow speeds and limits pressure spikes in closed heating loops.
The first line of defense in domestic water sanitation, filtering up to 98% of particulate impurities in supply lines.
Go to Filter Systems
Provides connections for electrical thermal actuators in zone manifolds.
Controls hot and cold inlet flows for water boilers, using a polished spherical spool design.
Go to Boiler Valves
Automatically releases accumulated gases to prevent lockups in HVAC circuits.
Discharges excess air in heat pump and heat generator lines to ensure reliable system operation.
Go to Venting Valves
Standardized brass bibcock connections for municipal water supply lines.
Maintains minimum flow rates in residential underfloor heating systems.
Traps debris ahead of pressure regulators and control valves.
Mixes warm and cold water feeds to maintain consistent supply temperatures, protecting piping systems.
Go to Mixing Systems
Heavy-duty, vibration-dampening brackets for manifold installations.
Provides visual indication and balancing control for individual radiant floor heating zones.
Integrates with thermal actuators to adjust and maintain room temperatures.
Go to Control Hubs
Filters and purges pipeline impurities while monitoring temperature and pressure ahead of zone manifolds.
Go to HVAC Valves
Distributes flow to various rooms while integrating temperature balancing controls.
Go to Manifold Systems
Monitors system pressure and fluid temperatures to ensure safe operation limits.
Combines a standard isolating ball valve with an internal stainless steel filter screen to protect downstream equipment.
Allows manual balancing and regulation of supply lines in underfloor radiator loops.
Maintains consistent water temperatures in underfloor systems by blending hot boiler feed with cooler return water.
Designed for multizone water distribution, featuring integrated visual flow gauges and balance valves.
Durable outer tap connection featuring a corrosion-resistant polished finish and quick-connect hose threads.
A brass gate valve designed for isolating main water feeds with minimal pressure drop when fully open.
Threaded connection tubes designed to couple utility meters directly with main service pipes.
Hose barb connectors engineered to US specifications, ensuring leak-free connections in commercial washdowns.
We produce specialized valve types for various residential, industrial, and HVAC applications. These components are designed and manufactured using CNC machinery to maintain tight tolerances and ensure reliable operation under varying pressures.
Forged brass piston valves that regulate high incoming pressure to stable operational levels, protecting downstream piping and appliances.
Heavy-duty brass taps for external installations, featuring thick-walled forged bodies designed to withstand freezing temperatures.
High-performance ball valves designed for regulating pressure relief and controlling flow rates in industrial pipeline networks.
Designed for full-flow isolation in water distribution grids, featuring internal threads to reduce installation clearance requirements.
Nickel-plated check valves coupled with T-strainers to prevent backflow and capture particulate debris in a single compact assembly.
Vertical foot valves featuring built-in brass mesh filters to protect intake pumps by screening out sand and debris.
The global fluid control industry is adapting to new environmental regulations, material safety laws, and the integration of smart systems. We keep our manufacturing operations aligned with these shifting industry standards:
Public health policies are leading to tighter restrictions on lead content in potable water components. We offer lead-free options, including silicon-substituted and bismuth-substituted brass alloys.
Modern float valves require precise dimensional control to prevent leakages and ensure consistent operation. Our investments in automated CNC machines allow us to produce components with tight tolerances.
Underfloor heating and building management systems are increasingly automated. We engineer our manifolds and valve products for compatibility with digital actuators and smart thermostats.
Selecting the right material is essential for maintaining chemical stability and preventing galvanic corrosion. The table below compares the common alloy options used in our production lines:
| Brass Designation | Lead Content % | Corrosion Resistance | Recommended Use Cases |
|---|---|---|---|
| CW617N (EN 12165) | 1.6% - 2.5% | Standard | General heating and HVAC loop valves. |
| DZR Brass (CW602N) | < 2.8% | Excellent (Dezincification Resistant) | Corrosive water systems and commercial plumbing. |
| C37700 Lead-Free | < 0.25% | High | Potable drinking water systems (North America/EU). |
The size of the float ball is calculated based on the fluid density, incoming pressure, and leverage ratio of the valve arm. Higher inlet pressures require a larger float volume to generate the buoyancy force needed to close the valve seat against incoming pressure.
We use matching alloys for the valve components and connection rods, or insert non-conductive isolators (such as EPDM gaskets or PTFE bushings) at connection points to break the electrical pathway between dissimilar metals.
Yes, we offer comprehensive OEM and ODM support. Our design team uses CAD software to convert technical drawings into production specifications, utilizing our CNC machine tools to produce components that meet specific dimensions and tolerances.
Our standard quality control process includes: checking raw material chemistry with spectrometer testing, verifying dimensions with optical comparators, checking threaded connections, and performing pneumatic pressure tests at 1.5 times the rated working pressure to ensure leak-free performance.
Cokaren products designed for potable water applications are manufactured using certified lead-free brass alloys, which limit lead content to under 0.25% in compliance with NSF/ANSI 61 and NSF 372 standards.
