Yongda
Yongda
Discover our highly-engineered range of HVAC components, brass manifolds, and thermal actuators optimized for efficiency.
Yuhuan Yongda fluid control Co., Ltd. (formerly Yuhuan Yongda plumping Co., Ltd.) was founded in 1996, and is located in "China valve capital" – Yuhuan, Zhejiang; as one of the professional plumbing valve enterprises, it focuses on product design, development, production, and sales.
Products are mainly divided into three categories: brass valves, fittings, and HVAC products. The products are positioned in the middle and high grade, highlighting the advantages of environmental protection, favored by consumers in North America, Europe and other markets.
With our brand commitment "keep flowing, keep warming" through our dedicated brand Cokaren, we provide a perfect service to customers. Cokaren is implementing its strategy to be a highly dynamic enterprise, with the aspiration for consistent growth to become a world-class brand.
Understanding how safety and cost-efficiency intersect in modern fluid control networks.
A Velocity Check Valve (often referred to as an excess flow valve) represents a critical safety installation in high-pressure, hazardous fluid transportation, and distribution pipelines. Unlike traditional non-return check valves, which primarily prevent backflow, a velocity check valve is engineered to monitor fluid flow velocities. If the flow rate exceeds a pre-determined safe threshold—usually caused by a downstream pipeline rupture, system compromise, or mechanical failure—the internal poppet immediately snaps shut, preventing catastrophic leaks or explosions.
Automatically isolates compromised pipeline segments when downstream flow exceeds calibrated velocities, protecting workers, property, and environmental integrity.
Sourcing "cheap" valves doesn't mean compromising quality. Thanks to Yuhuan’s integrated industrial cluster, we balance high-performance alloy fabrication with unmatched manufacturing economy.
Compliant with international manufacturing standards such as ISO 9001 and CE directives, ensuring safety in European and North American industrial settings.
The term "cheap" in modern fluid dynamics engineering refers to structural cost optimization. Chinese valve manufacturers, particularly those within the Zhejiang Yuhuan cluster, benefit from advanced industrial ecosystems, raw material proximity, and highly automated production processes. Yuhuan Yongda Fluid Control utilizes more than 600 sets of advanced testing and production equipment (including 80+ specialized CNC machines) to optimize production yields. This drastically reduces unit costs while keeping quality metrics precisely aligned with the requirements of major global B2B buyers.
A breakdown of materials, certifications, and manufacturing protocols that make our valves resilient.
Yuhuan Yongda designs its velocity check valves using premium brass formulations. We specialize in lead-free and dezincification-resistant (DZR) brass alloys, which are critical for potable water applications in North America and Western Europe. Our materials resist pitting, stress corrosion cracking, and electrochemical decay in aggressive water conditions.
Every single valve undergoes rigorous hydro-pneumatic and leak testing before shipment. By adhering to our corporate motto "Customer first, Quality based", we ensure zero defect rates on high-volume production lines. Our production processes conform to ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 standards.
| Parameters | Standard Specifications | Premium Options |
|---|---|---|
| Body Material | HPb59-1 Brass / CW617N | DZR Lead-Free Brass |
| Nominal Pressure | PN16 / 232 PSI | PN25 / 362 PSI |
| Medium Temperature | -20°C to 110°C | Up to 150°C (Solar Rated) |
| Connection Types | NPT / G Thread / Solder | Compression & PEX Lock |
| Sealing Element | EPDM / NBR | Viton (FKM) / PTFE |
Explore how Yuhuan Yongda integrates smart manifolds, water filters, thermal actuators, and mixing units into cohesive systems.
Under the brand Cokaren, we offer highly optimized energy distribution modules. These systems manage, filter, bypass, and regulate the flow of thermal media inside modern residential and commercial heating setups. The system is detailed as follows:
Serving as the first line of defense in domestic water sanitation. It filters 98% of sediment and physical impurities in the pipeline, ensuring downstream safety for appliances and sensitive thermal actuators.
Engineered with a spherical spool configuration to control the inflow and outflow of cold and hot water in heating boilers, facilitating easy system isolation during maintenance cycles.
Discharges excess air bubbles in closed hydronic systems to prevent air locks, reduce system corrosion, and maintain steady heat transfer across underfloor heating zones.
Balances and mixes hot boiler water with cooler return water. This stabilizes localized manifold temperatures and protects plastic PEX pipelines from thermal degradation.
Connects sensors and thermal actuators, executing digital algorithms that adjust zone temperatures dynamically based on ambient conditions.
Multi-purpose brass valves designed to filter debris, discharge excess air, control main loop flows, and provide diagnostic readouts for pressure and temperature.
How Yuhuan Yongda balances global standardizations with dedicated employee culture.
Culture: Struggle, Enterprising, Pragmatic, Innovative
Tenet: Customer first, Quality based
Quality Policy: Fine work, no leakage
Efforts are continuously made to develop the company's capabilities and motivation, improve the income and welfare of employees, and seek the alignment of company growth and personal happiness.
To serve top-tier commercial clients in European and American markets, we operate a production facility certified by multiple international organizations:
Practical engineering guidance on deploying velocity check valves across major sectors.
Depending on the localized fluid environment and regional code requirements, velocity check valves are deployed differently. Below are key scenarios that demand precise flow calibration:
Installed at the inlet manifold of domestic combi-boilers. If a piping rupture occurs inside the house, the velocity check valve senses the abrupt decrease in system pressure and high flow velocity, snapping shut to prevent water damage.
Utilized to protect against excess flow conditions in compressed gas, LPG, or anhydrous ammonia supply lines. The valve seals the line if a hose bursts, preventing gas discharge.
Integrated within multi-zone manifolds to ensure that localized line ruptures do not drain the thermal fluid of the entire multi-story heating loop, protecting structural elements.
To avoid false closures (nuisance trips) during peak heating or fluid transmission cycles, engineers must size velocity check valves carefully. The closing flow rate must be set higher than the maximum anticipated normal system flow, but lower than the lowest anticipated flow when a pipeline failure occurs downstream. Factors like viscosity, pressure drops, and system temperature should be reviewed with Yuhuan Yongda's technical team before high-volume B2B orders are placed.
Expert answers to common sourcing, engineering, and logistic questions about velocity check valves.
Premium brass valves, high-performance manifolds, and intelligent thermostats for global builders and distributors.
