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Help CenterMarine Check Valve for Desulfurization Tower, Dual Plate Design, Duplex SS, Max 300°C, PN40
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Shanghai Zhibang Valve Manufacture Co., Ltd. presents our premium Marine Check Valve for Desulfurization Tower, featuring a robust Dual Plate Design and constructed from Duplex Stainless Steel. Designed to withstand extreme conditions up to 300°C and rated PN40, this valve ensures reliable backflow prevention in aggressive desulfurization environments. As an ISO9001 certified manufacturer since 2016, we deliver a product that combines corrosion resistance, high-temperature durability, and a compact footprint for space-constrained marine installations.
The dual plate check valve (also known as a wafer check valve) is engineered for minimal pressure drop and rapid closing response, reducing water hammer and system vibration. Its duplex SS construction offers excellent resistance to chloride stress corrosion cracking, making it ideal for seawater and flue gas desulfurization (FGD) systems. With annual export values exceeding US$1 million, our valves are trusted by customers across North America, South America, Europe, Asia, Africa, and Oceania.
Key Features & Technical Specifications
- Dual Plate Design: Two spring-loaded plates provide low opening pressure and quick closing, preventing reverse flow efficiently.
- Duplex Stainless Steel Material: Superior corrosion resistance in acidic, chloride-rich environments (e.g., FGD slurry, seawater).
- High Temperature Capability: Rated for continuous operation up to 300°C (572°F), suitable for hot flue gas lines.
- High Pressure Rating: PN40 (Class 300) ensures safe operation in demanding high-pressure systems.
- Compact Wafer Style: Lightweight and short face-to-face dimension for easy installation between flanges.
- Low Pressure Drop: Streamlined flow path minimizes energy losses.
- Customizable Options: Sizes from DN50 to DN600, various end connections (wafer, lug, or flange), and optional coatings available upon request.
- ISO9001 Quality Assurance: Manufactured under strict quality control procedures.
| Parameter | Value |
| Material | Duplex Stainless Steel (ASTM A995 / A890) |
| Design Standard | API 594, BS 5153, or equivalent |
| Pressure Rating | PN40 (Class 300) |
| Temperature Range | -20°C to +300°C |
| Connection Type | Wafer (Lug or Flange optional) |
| Size Range | DN50 – DN600 (custom sizes available) |
| Applicable Media | Seawater, flue gas, chemicals, steam |
| Certification | ISO9001:2015 |
Our dual plate marine check valves offer distinct advantages for desulfurization tower applications. The duplex stainless steel body withstands the corrosive attack of sulfuric acid formed in FGD systems, while the spring-assisted plates close instantly at any flow rate. The wafer design reduces weight by up to 60% compared to conventional swing check valves, simplifying support structures and lowering installation costs. Additionally, the low cracking pressure (typically 0.5–1.0 psi) allows operation in low-flow conditions without risk of chatter or damage.
For marine environments, the valve's corrosion resistance is critical. Duplex SS offers twice the strength of austenitic stainless steel and superior pitting resistance (PREN > 35). This translates to longer service life and reduced maintenance intervals even in highly aggressive desulfurization liquor. The PN40 rating covers typical high-pressure feed lines, and optional spring materials (Hastelloy, Inconel) are available for extreme chemical compatibility.
Trusted Supply Chain & Global Reach
Shanghai Zhibang Valve Manufacture Co., Ltd. has been a reliable partner since 2016, exporting over US$1 million annually. Our products are shipped from major Chinese ports (Shanghai, Guangzhou, Hong Kong, Beijing) to all continents. With ISO9001 certification, we ensure consistent quality and on-time delivery. Whether you need standard sizes or custom designs, our engineering team can provide tailored solutions for your desulfurization tower and marine systems.
Contact us today to discuss your specific requirements. We offer competitive pricing, technical documentation, and post-sales support to ensure your operations run smoothly.
Frequently Asked Questions
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Q: What is the working principle of a dual plate check valve?
A: The dual plate check valve uses two spring-loaded hinged plates that open when forward flow occurs and close automatically when flow stops or reverses, preventing backflow. -
Q: Can this valve be used for seawater desulfurization?
A: Yes, the duplex stainless steel material provides excellent resistance to chloride attack and acidic conditions typical in seawater desulfurization processes. -
Q: What is the maximum temperature this valve can handle?
A: The standard design is rated up to 300°C. For higher temperatures, consult our engineering team for material upgrades (e.g., super duplex or nickel alloys). -
Q: Is the valve suitable for vertical installation?
A: Yes, the dual plate design can be installed in vertical, horizontal, or inclined piping. Spring tension ensures reliable closing in any orientation. -
Q: What certifications do you have?
A: Our factory is ISO9001:2015 certified. Additional certifications (such as NACE, CE, or ABS) can be provided upon request and may affect lead time. -
Q: Can I get custom sizes or flanged ends?
A: Absolutely. We offer wafer, lug, and flanged connections. Custom sizes outside the standard range are available, please provide your specifications. -
Q: How do I install a wafer check valve?
A: Center the valve between two flanges, ensure gaskets are properly placed, and bolt through the studs. Do not use the valve as a pipe support. -
Q: What is the typical lead time?
A: For standard sizes (DN50–DN300), lead time is 15–25 working days. Larger or custom orders may require 30–45 days. We offer expedited shipping options.
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