Yongda
Yongda
Explore our CE certified range of temperature controllers, underfloor heating manifolds, and industrial-grade brass hardware designed for global deployment.
An authoritative deep-dive into mechanical design parameters, metallurgical properties, and fluid dynamics.
Pressure adjustment valves (also known as pressure reducing valves, or PRVs) are the cornerstone of commercial, residential, and industrial water distribution networks. Operating on the principle of direct-acting force balance, these components continuously regulate high variable upstream pressure down to a stable, pre-set downstream limit. Under fluctuating inlet flows, the internal spring mechanism works in equilibrium with the diaphragm, ensuring precise control of the valve orifice. This limits dynamic hydraulic stresses, protecting sensitive components like thermostats, boiler exchangers, and underfloor manifold setups from catastrophic overpressure failures.
The core components include a forged brass body, stainless steel spring cartridge, reinforced synthetic EPDM diaphragm, and NBR dynamic seals. By utilizing CW617N or DZR (Dezincification Resistant) lead-free brass, our factory guarantees maximum durability against soft-water corrosion and galvanic degradation, satisfying strict EN standards.
| Parameters | Industrial Specification | Compliance Standards |
|---|---|---|
| Body Material | HPb59-1 / CW617N / DZR Brass | EN 12165 / GB/T 5231 |
| Nominal Pressure | PN10 / PN16 / PN25 | ISO 228-1 / DIN EN 1092-3 |
| Adjustment Range | 1.5 bar to 6.0 bar (customizable) | CE Certified / PED 2014/68/EU |
| Maximum Temp | 90°C / 110°C (HVAC standard) | BS EN 1567 |
| Medium Compatibility | Water, Glycol Mixes (up to 50%) | Directives 2011/65/EU (RoHS) |
Delivering robust flow and pressure management systems across multi-scale global infrastructures.
In large radiant district heating environments, fluid thermal expansion causes severe systemic pressure fluctuations. Utilizing CE-marked differential pressure bypass groups and balancing valves balances flow distribution to every residential unit, maintaining constant thermal efficiency and zero water-hammer noise in manifolds.
High-capacity heating systems and industrial steam boilers demand flawless pressure relief and stabilization. Operating under strict EN 12828 parameters, our valves maintain safe limits, venting excess volume dynamically while stabilizing makeup feed lines to extend boiler service life.
High-rise luxury commercial towers experience huge static pressure differentials between floors. Zoned installation of lead-free brass pressure regulation components stabilizes outlet delivery to water fixtures, eliminating excessive water wastage and cavitation in pipe systems.
Founded in 1996, Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) is located in Yuhuan, Zhejiang, the globally recognized "China Valve Capital." As a pioneer in the design, development, and sale of advanced plumbing valves and HVAC components, we operate with a singular dedication to engineering excellence.
Our product portfolio is divided into three major categories: brass valves, high-precision brass fittings, and HVAC system products. Engineered for mid-to-high-end markets, our products highlight environmental sustainability, lead-free composition, and durability, earning high trust from engineering contractors and distributors across North America and Europe.
To support this commitment to quality, our newly established brand Cokaren is dedicated to developing products with a more refined appearance and superior internal engineering, promising to "Keep Flowing, Keep Warming" for homes and facilities worldwide.
Company Culture: Struggle, Enterprising, Pragmatic, Innovative.
Tenet: Customer First, Quality Based.
Quality Policy: Fine work, no leakage.
Compliance is non-negotiable in global fluid distribution systems. Yuhuan Yongda operates under a strictly certified framework, holding ISO 9001:2015 (Quality Management System), ISO 14001:2015 (Environmental Management System), and ISO 45001:2018 (Occupational Health and Safety Management System).
Our pressure adjustment valves and manifolds carry full CE Certification, proving conformance with the Pressure Equipment Directive (PED) 2014/68/EU. This ensures that every shipment meets EU safety, health, and environmental requirements, passing pressure cycle tests, aging tests, and 100% helium seal testing before dispatch.
High performance integrated water sanitation, radiant distribution, and temperature balancing systems.
The first line of defense in domestic water sanitation, filtering 98% of particulates and impurities in the supply pipeline to protect downstream control systems.
Used to control the inflow and outflow of cold and hot water in heating boilers. Features a low-friction spherical spool design for long-life operation.
Engineered to discharge trapped air in heating and solar source systems automatically, preventing air-locks and ensuring heat exchanger efficiency.
Controls flow path in district heating loops, mixing cold and hot return water to stabilize distribution temp and protect manifold pipes.
Bridges the HVAC plumbing circuit with electrical commands, managing temperature dynamically to lower system energy usage.
Monitors pressure, measures local temperature, filters line sediments, and provides isolated controls for district radiator systems.
Manages zone division in multi-floor residences, distributing optimal volume flows to hydronic circuits and underfloor networks.
Cokaren Premium mechanical valves engineered for distribution systems.
Integrates fluid isolation and secondary particulate filtration inside a single brass housing, reducing spaces and installation costs.
Offers manual or thermostatic adjusting bounds to match radiators, helping control room temperature directly.
Works in floor loops, blending return loops to maintain precise inlet warmth and protect floor structures.
A heavy-wall brass manifold body optimized for radiant heating distribution, featuring low pressure-drop profiles.
Cokaren brand outdoor-rated brass valve with freeze-resistant protection and threaded outlet ports.
Solid wedge brass gate valve designed for full-bore flow, minimizing turbulence and friction losses.
Seamless brass connectors designed to secure utility meter integrations, complete with alignment sleeves.
Corrosion-proof connectors manufactured according to US thread criteria to guarantee robust mechanical seals.
Leveraging advanced manufacturing clusters and internal vertical integration to guarantee cost and delivery consistency.
Yuhuan, Zhejiang, accounts for a dominant share of global brass valve exports, creating a mature ecosystem of raw material foundries, logistics networks, and mold tooling providers. Our 45,000 square meter factory (with 80,000 square meters of actual usable floor area) harnesses this cluster advantage, utilizing vertically integrated production lines that cover hot forging, high-speed precision CNC machining, surface treatment (electroplating/nickel plating), and automated quality testing.
By keeping raw-material formulation, die tooling, and testing in-house, we eliminate intermediate processing markups, maintaining control over tolerance dimensions (down to ±0.01mm) and surface finish. Over 600 sets of advanced tooling machinery, including 80+ dedicated heavy machineries, allow us to scale production rapidly to fulfill large OEM contracts on time.
Anticipating industrial smart buildings, environmental material laws, and IoT heating systems.
Our roadmap prioritizes standardizing mechanical linkages on pressure valves to accept modular electronic actuators. These integrations will feed temperature, flow rates, and dynamic downstream pressure back to central BMS systems via Modbus or Zigbee protocols.
To align with tightening global drinking water standards, we are shifting manufacturing to support lead-free, dezincification-resistant alloys like CW724R (silicon bronze). This safeguards health without compromising machinability or physical pressure thresholds.
Utilizing high-performance Computational Fluid Dynamics (CFD) software, our engineering team optimizes valve internal flow pathways to reduce cavitation, lower pressure drop coefficients (Kv/Cv), and reduce fluid turbulence noise.
Understanding the factors influencing bulk pricing, OEM customization costs, and shipping logistics.
Procuring industrial components requires understanding manufacturing cost drivers. Our baseline pricelist index for brass valves is determined by three variables: London Metal Exchange (LME) copper/brass raw price index, specified manufacturing tolerance levels, and purchase volume tiers.
For custom engineering and OEM contracts, tooling investments are optimized. When ordering custom manifolds or specialized pressure regulating valves, die production costs are offset when order quantities cross established wholesale tiers. We offer FOB Ningbo or FOB Shanghai delivery terms, working with top ocean carriers to guarantee container space and export compliance clearance.
Answers to technical and commercial questions about pressure adjustment valves.
CE Certification indicates compliance with European safety standards, specifically the Pressure Equipment Directive (PED) 2014/68/EU. This guarantees that the valve's wall thickness, thread design, and pressure retention capabilities have been tested to prevent mechanical failure under high-pressure operating conditions.
At Yuhuan Yongda, we run each valve through automated pressure-drop tests using pneumatic air pressure. If any micro-fissure or seal gap allows air to escape, the testing unit automatically rejects the component. This ensures that every shipped batch conforms to a "no leakage" standard.
Typical lead times range from 30 to 45 days. This includes drawing approval, mold prototyping, sample validation, and automated production testing. Repeat orders can often be delivered faster, depending on material inventory levels.
CW617N is a European standard brass alloy containing controlled copper-lead-zinc proportions. It offers excellent hot forging characteristics and high mechanical strength, while preventing issues like stress corrosion cracking that can occur with lower-grade recycled brass alloys.
Yes, our EPDM diaphragms and dynamic NBR seals are compatible with glycol mixtures up to 50% concentration. The internal parts resist chemical additive breakdown, maintaining reliable pressure control across temperature cycles.
Explore our full line of brass fittings, check valves, and air release accessories to complete your commercial HVAC and radiant heating systems.
