Yongda
Yongda
Discover our standard and custom-engineered industrial brass valves, venting components, and pipeline assemblies.
In high-pressure gas networks, industrial heating grids, and modern residential gas appliances, the threat of backflow is a critical engineering challenge. Backflow can cause system contamination, severe equipment damage, and hazardous leaks. High-performance gas check valves act as the primary safety mechanism. They allow gas to flow in only one direction and close instantly when downstream pressures rise or input pressures fall below safety levels.
As a leading exporter of gas check valves, Yuhuan Yongda Fluid Control Co., Ltd. builds solutions that meet strict global performance criteria. Modern gas distribution relies on precision engineering. This requires custom spring tensions, specific cracking pressures, and durable seals made of elastomers like FKM or NBR. These valves are built to handle various gases, including natural gas, LPG, and industrial gas blends, ensuring long-term operation under extreme thermal and mechanical stresses.
Ensuring compliance, reliability, and robust supply chain integration for volume buyers.
Enterprise procurement teams in North America, Europe, and Asia look for more than just standard components. They need suppliers who offer absolute materials traceability, strict environmental compliance, and high delivery reliability. For gas check valves and related plumbing assemblies, these procurement requirements focus on three main areas:
Gas infrastructure systems must comply with local regulations. In Europe, components require CE marking, EN 331, and DVGW certification. In North America, gas valves must meet CSA, UL, and FM specifications. Sourcing from an ISO 9001 certified manufacturer ensures that the materials, dimensions, and test methods comply with these global regulations.
Global standards are phasing out high-lead brasses. Modern procurement demands low-lead or lead-free brass alloys, such as CW617N, CW602N (DZR), or HPb59-1. These alloys must offer excellent corrosion resistance and prevent dezincification, ensuring the valves remain durable and safe for municipal gas and hydronic systems.
Gas piping systems must achieve a 100% bubble-tight seal. Unlike water lines, minor gas bypasses can lead to hazardous gas accumulation. High-quality check valves feature soft-seated disc designs with NBR or Viton (FKM) seals, backed by 100% pneumatic testing under high and low pressures before shipment.
Technical specifications and materials engineering designed for modern gas and hydronic control systems.
To ensure high durability, our brass gas check valves and system modules use forged designs that eliminate internal casting defects. The table below outlines our technical specifications:
| Technical Parameter | Standard Specification | Premium Custom Options |
|---|---|---|
| Body Material | Forged Brass HPb57-3 / CW617N | Lead-Free Brass / CW602N (DZR / Dezincification Resistant) |
| Nominal Pressure | PN16 (232 PSI) / PN25 (362 PSI) | PN40 (580 PSI) for specialized systems |
| Seat / Seal Material | High-density NBR / EPDM | Viton (FKM) for high-temperature and chemical resistance |
| Spring Material | Stainless Steel AISI 304 | Stainless Steel AISI 316 for corrosive environments |
| Cracking Pressure | 0.02 - 0.05 Bar (Standard spring-loaded check) | Custom pre-set cracking pressures from 0.01 to 0.5 Bar |
| Temperature Range | -20°C to 110°C (Water & general gases) | -40°C to 180°C (Steam and chemical gases) |
| Thread Types | ISO 228 (BSP parallel), ISO 7 (BSPT tapered) | ANSI/ASME B1.20.1 (NPT threads) |
Our valve engineering solutions support modern smart buildings, safety-critical industrial applications, and high-performance heating systems:
1. Residential & Commercial Boiler Kits: Integrating check valves and automatic venting valves into boiler expansion groups prevents dangerous backflow. This maintains system equilibrium and prevents cold-water shock to the heat exchangers.
2. HVAC & Radiant Underfloor Heating Systems: Modern hydronic grids rely on precise mixing shunt units and manifolds. Installing check valves prevents cross-flow between mixing zones, keeping return-water temperatures stable and reducing energy consumption.
3. Clean Gas Energy Distribution: Our valves are engineered for low-pressure gas distribution manifolds and LPG regulator systems. They provide secure isolation to prevent system-wide contamination during maintenance or line pressure drops.
Yuhuan Yongda Fluid Control Co., Ltd. - A Legacy of Precision since 1996.
Founded in 1996, Yuhuan Yongda Fluid Control Co., Ltd. (formerly Yuhuan Yongda Plumbing Co., Ltd.) is located in Yuhuan, Zhejiang—known as the "China Valve Capital." We are a professional plumbing and valve manufacturer specializing in product design, development, production, and international sales.
Our product portfolio focuses on high-grade brass valves, brass fittings, and HVAC system accessories. By focusing on environmental compliance, reliability, and precision design, our products have gained strong market share in North America, Europe, and other global regions.
With our brand, Cokaren, and its core promise of "keep flowing, keep warming," we develop modern, high-quality, and visually refined fluid system solutions to make homes and businesses comfortable and energy-efficient worldwide.
Our manufacturing processes and products are certified to meet international environmental, safety, and operational standards:
- ISO 9001:2015 Quality Management System Certification.
- ISO 14001:2015 Environmental Management System Certification.
- ISO 45001:2018 Occupational Health and Safety Management System Certification.
Our quality assurance program is built on our core policy: "Fine work, no leakage." We test all products, using high-pressure air and water tests, optical spectrum analysis for alloy composition, and cycle tests to ensure the valves perform reliably under heavy use.
Common technical queries regarding selection, compliance, and custom ordering.
Lead-free brass alloys, like CW617N or DZR brass, prevent heavy metals from leaching into water systems. They also comply with strict environmental laws like RoHS, REACH, and the U.S. Safe Drinking Water Act (SDWA). This makes them safe for both drinking water and green residential applications.
Cracking pressure is the minimum upstream pressure required to open the valve disk against the spring force. For gas systems, low cracking pressures (0.02 - 0.05 Bar) are preferred. This minimizes pressure drop across the valve while ensuring it shuts quickly if the flow stalls or reverses.
We perform 100% pneumatic pressure testing on our gas check valves and boiler components. Additionally, we use high-grade Viton and NBR seats, precision-ground sealing surfaces, and AISI 304 springs. This combination ensures a bubble-tight seal that prevents any bypass, even at very low reverse pressures.
Yes, we provide full OEM and ODM services. We can customize thread types (NPT, BSP, BSPT), change body alloys, adjust spring tensions for custom cracking pressures, and apply private branding or logo laser markings on the valve body.
High-grade brass valves, actuators, and piping accessories exported globally.
