Yongda
Yongda
In modern infrastructure development, the integration of high-reliability Fire Sprinkler Systems relies heavily on state-of-the-art Alarm Control Valves. These critical components prevent backflow, govern static pressure, trigger mechanical fire alarms, and guarantee immediate containment fluid delivery during emergency system activations.
Global procurement teams prioritize compliance with NFPA 13 (Standard for the Installation of Sprinkler Systems) and EN 12845. Custom ODM solutions require strict material traceability to verify hydraulic performance under volatile temperature and pressure conditions.
Industrial installations demand high-grade alloy cast iron bodies combined with DZR (Dezincification Resistant) brass trim kits to survive harsh oceanic environments, chemical processing plants, and wet pipeline deployments.
Modern alarm valves are transitioning to smart trim pipelines. Integrating analog pressure transducers and smart flow switches with localized digital telemetry interfaces provides real-time health diagnostics directly to building control centers.
Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) is located in the heart of "China's Valve Capital" – Yuhuan, Zhejiang. As an industry-leading manufacturer of professional plumbing valves, our operational focus centers on the comprehensive design, development, large-scale production, and global export of advanced fluid control technologies.
Our expansive catalog covers three core segments: brass valves, high-precision fittings, and HVAC distribution components. Emphasizing environmental sustainability and compliance, we serve critical medium-to-high-grade markets throughout North America, Europe, and Asia.
Cokaren, our premium brand, is dedicated to developing products with a more refined aesthetic, superior mechanical longevity, and pristine build quality. Operating under our promise: "Keep flowing, keep warming," we ensure your residential and commercial hydronic piping networks operate reliably day in and day out.
Below is the mechanical layout detailing hydronic management systems and HVAC control products manufactured by Yongda and Cokaren, showing the integration of water filtration, thermal shunt units, and venting systems.
Yongda's multi-layered energy distribution system coordinates HVAC components, mixing assemblies, and sensor monitoring points to optimize warm water distribution across complex multi-zone buildings.
Engineered for high-volume hydronic systems with low frictional resistance.
Designed for secondary underfloor distribution setups with optimal thermal isolation.
Provides critical bypass capability for central boiler loops.
Protects circulation pumps from structural dead-heading conditions.
Provides micro-adjustable zone heat output control.
Overpressure protection calibrated to strict EN 1489 code specifications.
Maintains dynamic system balance under shifting inlet pressures.
Direct immersion temperature monitoring adapter for automation systems.
Fast-purging automatic air vent designed for initial system startup.
Integrated mesh strainer prevents sand and copper flakes from entering precision mixing zones.
Yongda maintains strict adherence to quality frameworks across our 80,000 square meter total usable manufacturing facility. Our processes are certified under the following standards:
Corporate Culture: Struggle, Enterprising, Pragmatic, Innovative. By optimizing production flows and automation, we seek a harmonious balance between corporate competitiveness and employee well-being.
Quality Directive: "Fine work, no leakage." Every individual brass valve and manifold undergo pneumatic and hydrostatic testing to guarantee zero failure rates at delivery.
Combines reliable shutoff with inline particulate filtration to protect downstream control devices.
Manual and thermostatic control architectures optimized for variable flow radiator terminals.
High-efficiency temperature regulation assembly designed to blend supply and return flows.
Underfloor heating manifold system designed for uniform distribution across multi-room zones.
Heavy-duty brass outdoor spigot and utility water tap, built to withstand freezing temperatures.
Traditional full-bore gate valve with robust brass seating, minimizing friction loss.
Custom length solid brass connection sleeves, simplifying the installation of water meters.
Engineered to meet US hose thread dimensions, offering tight connections with hose assemblies.
Brass forged piston valve designed to reduce inlet pressure and distribute flows.
Anti-corrosion brass tap with integrated water stop functionality.
Heavy duty union bib tap for rapid coupling and disconnect.
High flow capacity quarter-turn ball valve for structural fluid control.
Flow control valve designed for boiler overpressure safety venting.
Integrated locking mechanism prevents unauthorized water drawing.
Precision-milled internal threads provide leak-free joints.
Prevents backflow while catching debris within the dual chamber housing.
Simplifies sediment cleanout with easily accessible lateral plug design.
Retains pump prime with minimal head loss in deep line suction wells.
Ensures single-direction flow under variable pressure heads.
Complete pre-assembled station for floor heating temperature distribution.
Monitors system temperatures, regulating inlet flow rates automatically.
Integrated bypass safety loops designed for large multi-story residences.
Dual-purpose system vents air while equalizing dynamic pressures.
End unit fitting providing manual purge capability for loop bubbles.
Continuously expels trapped air to keep heating efficiencies high.
Protects boiler heat exchangers from air-locking and dry-firing failures.
Combined exhaust discharge and water drain system tail manifold.
Corrosion resistant fittings designed to support fast connections on poly lines.
Strict thread tolerance manufacturing ensures easy assembly and zero leaks.
In wet pipe sprinkler systems, an Alarm Check Valve serves as a check valve that prevents backflow of water from the sprinkler system into the municipal supply. It also triggers a fire alarm when a water flow exceeds a specified threshold. When a sprinkler head opens in response to heat, water starts flowing through the piping system. This flow lifts the valve clapper off its seat, opening a path through a small orifice called the alarm port. Water then flows to a mechanical alarm gong (water motor gong) or activates an electrical pressure switch, which relays an alarm signal to the fire control panel.
A typical ODM alarm control valve package includes several ancillary components:
Understanding the system environment is key when selecting alarm control valve setups:
| Feature | Wet Pipe Alarm Valve | Dry Pipe Alarm Valve |
|---|---|---|
| System Medium | Always filled with water | Pressurized air or nitrogen |
| Application Climate | Heated interiors (>4°C) | Unheated areas subject to freezing |
| Clapper Mechanism | Hydraulically balanced swing clapper | Differential area air-to-water seal clapper |
| Response Delay | Immediate flow upon head rupture | Delay while air vents from system |
In municipal and industrial fire systems, chemical reactions between piping materials and oxygenated water can lead to corrosion and microbial growth, which can cause valve failure. To ensure a 30-year operational life, quality exporters must implement strict material controls:
Dezincification-Resistant (DZR) Brass: Standard brass alloys lose zinc when exposed to water, a process called dezincification. This leaves a weak, porous copper structure prone to failure under pressure. For critical alarm valve trim components, sourcing teams require DZR brass (such as CW602N or C35330) to prevent this breakdown.
Lead-Free Environmental Compliance: With strict environmental regulations like NSF/ANSI 372 in North America and REACH in Europe, manufacturers must use lead-free brass formulations (lead content < 0.25%) to ensure safety when systems interface with potable water networks.
Yongda offers custom valve casting, CNC milling, and personalized engraving. Our engineering team designs custom trim manifolds to fit tight architectural spaces and meet local plumbing regulations.
We provide full material traceability reports (EN 10204 3.1 certification), pressure test sheets, and compliance certificates for all exports, streamlining customs clearance and local approvals.
All finished valves undergo pneumatic testing at 0.6 MPa and hydrostatic testing at up to 2.4 MPa. This rigorous quality control ensures leak-free performance and operational safety.
