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Help CenterHigh Temperature Steam Line Check Valve 425℃ for Marine Boiler, Carbon Steel, Metal Seal, DN80-DN150, Flanged
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Shanghai Zhibang Valve Manufacture Co., Ltd., established in 2016, is a professional manufacturer specializing in high-quality industrial valves for global markets. Our High Temperature Steam Line Check Valve 425°C for Marine Boiler is engineered to meet the demanding requirements of marine steam systems, offering reliable backflow prevention under extreme conditions. Made from carbon steel with a rugged metal seal, this flanged check valve covers sizes DN80 to DN150, ensuring a perfect fit for various boiler applications. Leveraging our ISO9001 quality management system and over US$1 million annual export value, we deliver products that combine durability, safety, and cost-effectiveness.
This check valve is specifically designed for high-temperature steam lines (up to 425°C) in marine boilers, where conventional rubber-sealed valves would fail. The metal-to-metal sealing technology provides a tight shut-off, preventing steam backflow and protecting downstream equipment. The carbon steel body offers excellent strength and corrosion resistance in the harsh marine environment, while the flanged connection simplifies installation and maintenance. Whether you are building a new vessel or retrofitting an existing system, this valve is a dependable choice.
Product Features & Technical Advantages
- High Temperature Resistance: Built to withstand continuous steam temperatures of up to 425°C, ideal for marine boiler superheated and saturated steam lines.
- Metal Seat Seal: Hard-faced metal seat ensures zero leakage at high temperatures and pressures, eliminating risks of rubber degradation.
- Durable Carbon Steel Body: WCB or WCC grade carbon steel provides robust mechanical strength and resistance to thermal shock.
- Flanged End Connections: Standardized flanges (ANSI 150/300, DIN PN16/25/40) allow easy integration into existing piping systems.
- Compact Disk Design: Lightweight disc minimizes pressure drop and reduces wear on seat surfaces during frequent operation.
- Full Port or Reduced Port: Available in full bore (DN80-DN150) to maintain flow efficiency; reduced port options for cost savings in less critical lines.
- In-line Repairable: Seat and disc can be replaced without removing the valve from the pipeline (optional design).
- Compliance with Marine Standards: Designed per API 602 and BS 1868, suitable for classification society requirements (upon request).
Technical Specifications
| Size Range | DN80, DN100, DN125, DN150 (3" – 6") |
| Maximum Temperature | 425°C (797°F) |
| Material – Body | Carbon Steel (ASTM A216 WCB / WCC) |
| Material – Trim | Stainless Steel 304/316 or Stellite (metal seat) |
| Flange Standard | ANSI B16.5 Class 150/300, DIN PN16/25/40 (customizable) |
| Pressure Rating | Up to 40 bar (depending on size & temperature) |
| Operation | Automatic (gravity/closing spring optional) |
| Certifications | ISO9001:2015 (manufacturing quality) |
Customer Benefits
- Extended Service Life: Metal seal and carbon steel construction resist erosion and thermal fatigue, reducing replacement frequency in marine boilers.
- Lower Total Cost of Ownership: No rubber parts to replace; simple design reduces maintenance downtime.
- Safety Assurance: Prevents dangerous steam backflow that could damage boiler tubes or cause system instability.
- Flexible Integration: Flanged ends allow rapid installation without welding; standard face-to-face dimensions comply with major piping codes.
- Customizable Options: Available with lifting lugs, extended stems, or different disc materials to suit specific marine class requirements.
As a manufacturer with ISO9001 certification and an annual export value of US$1 – US$1.5 million, Shanghai Zhibang Valve has supplied check valves to shipyards, marine equipment dealers, and offshore platforms across North America, Europe, Southeast Asia, and the Middle East. Our production lines undergo strict quality checks including hydrostatic and pneumatic testing, ensuring every valve meets the stringent demands of marine boiler applications. With shipping ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we offer efficient logistics and competitive lead times.
Contact us today for a quotation or technical datasheet. Our engineers can help you select the correct pressure class or custom features for your specific marine boiler steam line. Choose Shanghai Zhibang Valve – reliability under extreme conditions.
Frequently Asked Questions (FAQ)
Q1: What media can this check valve handle besides steam?
A1: It is primarily designed for high-temperature steam, but can also handle hot water, thermal oil, and other non-corrosive gases/liquids up to 425°C. For aggressive media, please consult our engineers for material upgrades.
Q2: Can the valve be installed vertically?
A2: Yes, this swing-type check valve can be installed in both horizontal and vertical upward-flow positions. For vertical downward flow, a spring-assisted closing mechanism is recommended (available as an option).
Q3: What is the typical pressure rating for DN150 at 425°C?
A3: For a carbon steel valve with metal seat, the allowable pressure at 425°C derates per ASME B16.34. For Class 150, it drops to about 10–12 bar; for Class 300, it can be up to 25 bar. We provide detailed pressure-temperature charts upon request.
Q4: How does the metal seal compare to a soft seal?
A4: Metal seal offers superior temperature and wear resistance, making it ideal for continuous 425°C steam. Soft seals (PTFE, rubber) would degrade quickly above 200°C. Metal seal may have slightly higher leakage rates initially but becomes tighter after a few cycles due to lapping.
Q5: Is this valve compliant with classification societies like DNV or Lloyds?
A5: Our standard design meets API 602 and BS 1868. For specific class certification (e.g., DNV-GL, Lloyd’s, ABS), we can arrange third-party inspection and certification at an additional cost. Please specify your requirement when ordering.
Q6: What is the delivery time for DN100 valves?
A6: For standard DN80–DN150 sizes in carbon steel, typical lead time is 20–30 working days. Rush orders can be arranged within 15 days with prior confirmation. Our location in Shanghai allows fast shipping to major ports.
Q7: Can I get a sample valve for testing?
A7: Yes, sample orders are welcome. We offer competitive sample pricing, and the cost can be refunded in future bulk orders. Contact our sales team for sample availability and shipping details.
Q8: How often should the valve be inspected?
A8: For continuous high-temperature service, we recommend a visual inspection and functional test every 6 months. Internal inspection (seat and disc condition) should be performed annually or according to your vessel’s maintenance schedule.
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