Yongda
Yongda
Highly durable brass valves built to handle variable inlet pressures up to 1600 kPa down to standard domestic and industrial distribution levels.
Heavy forged brass body featuring a piston design for reliable regulation of municipal mains down to 350-500 kPa.
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Specially designed angle isolation and safety valves for domestic and industrial boiler feedwater systems.
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Optimized hydronic underfloor manifolds to distribute stable flow rates in South Island residential builds.
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Durable, high-zinc migration resistant brass compression joints matching standard NZ size tubing.
Technical Data SheetNew Zealand's municipal water networks present unique challenges for hydraulic engineering. Across major centers like Auckland, Wellington, and Christchurch, main water supply pressures can exceed 800 kPa to 1000 kPa. According to the New Zealand Building Code (NZBC) Clause G12, the maximum static pressure at any outlet point within a building must not exceed 500 kPa to prevent damage to internal pipe networks, tapware, and domestic appliances.
This strict limit requires highly reliable Pressure Reducing Valves (PRVs) at water meter entry points. Our forged brass PRVs are built to comply with AS/NZS 3500.1 standards. By lowering dynamic and static pressure, they protect piping systems from water hammer, reduce flow velocity noises, and lower municipal water consumption.
With Wellington’s aging infrastructure causing systemic pipe bursts and Auckland’s volcanic topography requiring multi-tier pressure zoning, choosing the right valve metallurgy is paramount for regional contractors.
| Parameter | AS/NZS Specification | Yongda Valve Capability |
|---|---|---|
| Maximum Inlet Pressure | Up to 1,600 kPa | 1,600 kPa (PN16 rated) |
| Outlet Control Range | 150 kPa - 600 kPa | 100 kPa - 600 kPa (Adjustable) |
| Material Standard | Dezincification Resistant (DZR) | CW617N / HPb59-1 Forged Brass |
| Thread Type | AS 1722.1 Parallel (G/BSP) | BSP Parallel Thread Precision CNC |
| Dynamic Performance | Stable under variable load | Piston & Diaphragm Balanced Action |
A significant portion of New Zealand's municipal water supply contains chemical characteristics that accelerate dezincification in standard brass valves. This chemical reaction leaches zinc out of the copper alloy, leaving a porous, structurally weak copper skeleton that leads to valve failure and hazardous leaks.
To combat this, Yuhuan Yongda Fluid Control utilizes premium forged brasses, including CW617N and specific lead-free brass formulations, which undergo meticulous thermal treatment. The microstructure of our forged bodies guarantees high resistance to stress corrosion cracking and dezincification. The piston seals and internal diaphragms use high-temperature EPDM or Viton elastomers to ensure tight seating and a long operational lifespan.
Founded in 1996, Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) is located in the "China Valve Capital" – Yuhuan, Zhejiang. We specialize in the design, development, production, and distribution of high-grade brass valves, fittings, and HVAC products.
Operating a massive 45,000 square meter factory with an actual usable floor space of over 80,000 square meters, our facilities are equipped with more than 600 sets of advanced production and testing apparatus, including 80+ specialized CNC machining centers. This production capacity enables us to meet demanding international delivery schedules and provide competitive direct-factory pricing to the New Zealand import sector.
Through our new premium brand, Cokaren, we are committed to delivering valves with refined aesthetics and superior performance, backed by our core brand promise: "Keep flowing, keep warming."
To support global supply chains and protect local water infrastructure, our manufacturing processes are certified to the highest international standards. We maintain strict compliance with ISO 9001:2015 Quality Management Systems, ISO 14001:2015 Environmental Management Systems, and ISO 45001:2018 Occupational Health and Safety Management Systems.
Our quality control policy is straightforward: "Fine work, no leakage." Every single valve undergoes static hydraulic testing under load to confirm zero defect rates before export. This rigorous testing minimizes system failures in high-pressure distribution zones like the Canterbury plains and Wellington's commercial districts.
Safety Certification Notice: All commercial brass fixtures destined for potable water configurations comply with low-lead migration requirements, ensuring clean water delivery across NZ homes and industrial complexes.
Explore our unified hardware system, ranging from water intake filtration to underfloor distribution manifolds and automatic air venting controls.
The primary defense in domestic plumbing, removing 98% of particulates and protecting downline PRVs.
Designed with a spherical brass spool to manage system inlet and outlet configurations.
Discharges excess air in high-pressure heat pumps and boilers to ensure smooth operation.
Accurately blends hot boiler discharge with return water for floor heating loops.
Provides room-by-room temperature regulation through electronic manifold integration.
Combines structural filtration, isolation, and pressure monitoring in one unit.
Standard catalog components engineered for New Zealand distributors and plumbing merchants.
Combines water shutoff and debris filtration in a single compact forged body.
Provides reliable manual adjustment for hydronic heating loops.
Balances hot water intake to keep underfloor heating surfaces at safe temperatures.
Multi-port distribution manifold with adjustable balancing valves.
Durable outdoor brass faucet designed to handle high pressures and cold temperatures.
Features a solid wedge and robust design for isolation in plumbing systems.
Accurately machined couplings for easy integration with standard residential meters.
Features clear, reliable thread connections for heavy-duty industrial hoses.
Additional components to complete large-scale residential and commercial heating projects.
Provides reliable isolation for individual residential fixtures like vanity basins and toilets.
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Forged inline design providing reliable shutoff for water distribution lines.
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Electroplated finish with a locking key to prevent unauthorized water use in public spaces.
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Precision-threaded inserts for overmolding in composite piping networks.
Technical Data SheetSourcing directly from our Yuhuan factory allows New Zealand civil contractors, commercial heating merchants, and municipal buyers to reduce procurement costs while maintaining strict quality control. Shipping channels from Ningbo or Shanghai port provide direct transit options to Auckland (Port of Onehunga/Waitemata), Tauranga, and Lyttelton within 18 to 25 days.
We manage all aspects of export packaging, using reinforced pallet crates designed to withstand maritime humidity and prevent thread damage during transport. Working with Cokaren gives you access to a dedicated engineering support team to resolve design issues before manufacturing begins.
Our valve assemblies are designed for three primary environments in New Zealand:
1. Multi-Level Auckland High-Rises: Managing high pressure zones by installing PRVs at each level to step down mains pressure to a safe 350 kPa, protecting building plumbing and fittings.
2. Otago & Canterbury Hydronic Heating: Using stainless steel manifold systems and smart thermal actuators to manage underfloor heating systems during sub-zero Southern winters.
3. Waikato Dairy Washdown Systems: Providing high-flow rate, corrosion-resistant brass ball valves built to handle the chemicals and high wash frequencies of modern dairy plants.
Additional components designed to match your main pressure reducing assemblies, certified for industrial and domestic installations.
90-degree threaded compression elbow built to connect secure PEX tube turns with low pressure drop.
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Compact isolation valve designed for tight installations and instrumentation piping.
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Precision-machined threaded sockets to extend pipe runs in municipal water connections.
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Features CE certification with built-in flow meters for reliable multi-zone heat regulation.
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Protects circulation pumps in HVAC systems by maintaining stable pressure differences.
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Designed for heavy boiler connections, using high-tensile hot-forged brass.
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Reliable isolation angle valves designed for domestic plumbing applications.
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Provides automated heating loop control via direct thermostat integration.
Technical DataAnswers to common design, standards, and import questions for the New Zealand market.
Contact our project engineers for bulk pricing discounts, material test certificates, or specific dimension modifications for New Zealand infrastructure projects.
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