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Help CenterCarbon Steel Marine Check Valve 425℃, Metal Seat, DN80-DN150, PN40 Flanged
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Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our Carbon Steel Marine Check Valve designed for extreme operating conditions up to 425℃. Featuring a metal seat and PN40 flanged connection, this valve is engineered to provide reliable backflow prevention in high-pressure, high-temperature marine and industrial systems. Since our establishment in 2016, we have focused on manufacturing robust valves that meet the rigorous demands of global customers, and our ISO9001 certified production process ensures consistent quality and performance.
This check valve is available in sizes from DN80 to DN150 (3" to 6"), making it suitable for a wide range of piping applications. The carbon steel body offers excellent strength and corrosion resistance in demanding environments, while the metal seat provides enhanced durability and tight sealing even under thermal cycling. Whether you need a check valve for steam, oil, or water systems, our product delivers reliable operation with minimal maintenance.
Key Features & Benefits
- High Temperature Resistance: Rated for continuous operation at 425°C, suitable for superheated steam and hot oil applications.
- Metal Seat Design: Ensures bubble-tight shut-off and long service life, even at elevated temperatures where soft seats would fail.
- Robust Carbon Steel Construction: ASTM A216 WCB or equivalent, providing excellent mechanical strength and resistance to thermal stress.
- PN40 Flanged Connection: Raised face or flat face flanges per ASME B16.5 or EN 1092-1, compatible with standard piping systems.
- Swing / Lift Type: Available in both swing-check and lift-check configurations to suit different flow conditions and installation orientations.
- Marine Grade: Designed to withstand harsh marine environments, including vibration, corrosion, and temperature extremes.
- Low Pressure Drop: Optimized internal geometry minimizes flow resistance, improving system efficiency.
- Easy Maintenance: Accessible cover design allows quick inspection and replacement of internal parts without removing the valve from the pipeline.
Technical Specifications
| Parameter | Value |
| Size Range | DN80, DN100, DN125, DN150 (3" to 6") |
| Pressure Rating | PN40 (Class 300 / 40 bar) |
| Maximum Temperature | 425°C (797°F) |
| Body Material | Carbon Steel (ASTM A216 WCB) |
| Seat Material | Stainless Steel (Metal Seat) |
| Disc Material | Carbon Steel / Stainless Steel (optional) |
| Flange Type | Raised Face (RF) or Flat Face (FF) |
| Design Standard | API 6D / BS 1868 / ASME B16.34 |
| Test Pressure (Shell) | 1.5 x PN = 60 bar |
| Test Pressure (Seat) | 1.1 x PN = 44 bar |
Product Details
Our Carbon Steel Marine Check Valve is specifically engineered for high-temperature applications in the maritime, petrochemical, and power generation industries. The 425°C rating makes it ideal for superheated steam lines, thermal oil systems, and high-temperature processing where ordinary check valves would fail. The metal seat eliminates the risk of elastomer degradation, ensuring a tight seal over the entire temperature range.
The valve body is manufactured from high-quality carbon steel (ASTM A216 WCB) with PN40 flanged ends for easy installation in existing piping systems. Available in sizes DN80 to DN150, it can handle flow rates from medium to large pipelines. The swing-check design allows free flow in the forward direction and automatically closes when flow reverses, preventing backflow and protecting pumps, compressors, and other equipment.
Customer Benefits:
- Reduced Downtime: Long-lasting metal seat withstands thermal cycling and abrasive media, requiring fewer replacements.
- Enhanced Efficiency: Low-pressure-drop design minimizes energy loss, reducing operational costs.
- Global Compatibility: Flange dimensions conform to international standards (ASME, EN), simplifying integration.
- Certified Quality: Manufactured under ISO9001 quality management system, ensuring traceability and consistency.
- Versatile Applications: Suitable for water, steam, oil, gas, and seawater (with optional coating).
Why Choose Shanghai Zhibang Valve?
Established in 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. has grown into a reliable supplier of industrial valves to customers across North America, South America, Europe, Asia, Africa, and Oceania. Our annual export value of US$1 Million – US$1.5 Million reflects the trust our global partners place in us. We operate from our manufacturing facility in Shanghai, China, with convenient shipping via Shanghai, Guangzhou, Hong Kong, and Beijing ports.
Our ISO9001 certification guarantees that every valve is produced under strict quality control procedures, from raw material inspection to final pressure testing. We are committed to providing products that meet or exceed industry standards, backed by responsive customer support and flexible customization options. Whether you require non-standard flange drilling, special coatings, or additional testing, we can accommodate your needs.
Contact us today for competitive pricing, technical datasheets, and sample availability. Our experienced team is ready to assist you with valve selection, installation guidance, and after-sales service. Let Shanghai Zhibang Valve be your trusted partner for high-performance marine check valves.
Frequently Asked Questions
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Q: Can this valve be used for steam applications at 425°C?
A: Yes, the carbon steel body and metal seat are specifically rated for continuous service up to 425°C, making it suitable for superheated steam, thermal oil, and high-temperature process lines. -
Q: What is the maximum working pressure at 425°C?
A: The valve is rated PN40 (40 bar) at ambient temperature. At 425°C, the pressure rating may be reduced according to material derating curves. Please refer to the ASME B16.34 pressure-temperature table or consult our engineering team for specific conditions. -
Q: Is the metal seat bubble-tight?
A: The metal seat provides metal-to-metal sealing, achieving a Class VI shut-off (per FCI 70-2) under standard test conditions. For applications requiring zero leakage, optional soft seal inserts or lapped seats are available upon request. -
Q: What flange standards are available?
A: Our standard flanges are Raised Face per ASME B16.5 Class 300. Additionally, we can supply flanges per EN 1092-1 (PN40), JIS B2220, or other standards as needed. Please specify your requirement at the time of order. -
Q: Can the valve be installed in vertical pipelines?
A: Yes, the swing-check design can be installed horizontally or vertically. However, for vertical installations (flow upward), we recommend using a spring-assisted or lift-check version to ensure proper disc return. Customization is available. -
Q: What certifications do you provide?
A: Our valves are manufactured under ISO9001 quality management system. We can provide material test certificates (MTC), pressure test reports, and NDT reports upon request. Additional third-party inspection (e.g., Lloyds, DNV, Bureau Veritas) can be arranged at extra cost. -
Q: What is the typical lead time?
A: For standard sizes DN80-DN150, lead time is approximately 15-25 working days after order confirmation. Large quantities or customized versions may require 30-45 working days. Contact our sales team for accurate delivery schedules. -
Q: Do you offer test certificates and warranty?
A: Yes, each valve is hydrostatically tested per API 598, and a test certificate is included. We provide a 12-month warranty against manufacturing defects from the date of shipment. Extended warranties are available upon negotiation.
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