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Help CenterCBT4303 Marine Wafer Check Valve, 316 Stainless Steel, DN50-DN600
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As a professional manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents the CBT4303 Marine Wafer Check Valve. Engineered specifically for demanding marine and offshore applications, this valve is constructed from premium 316 stainless steel to withstand corrosive seawater environments. With over seven years of industry experience since our establishment in 2016, we have refined this product to offer reliable, maintenance-free backflow prevention for critical shipboard systems. Our annual export value of US$1-1.5 million reflects the trust placed in our products by clients across six continents.
Core Product Features & Technical Advantages:
- Superior Corrosion Resistance: The entire valve body, disc, and spring are made from 316 stainless steel (AISI 316), which provides excellent resistance to pitting and crevice corrosion in chloride-rich seawater, far exceeding the performance of 304 stainless steel.
- Compact Wafer Design: The wafer-style construction allows for easy installation between ANSI or DIN flanges, saving significant space and weight compared to lug-style or flanged check valves—a critical factor in marine engineering.
- Dual-Spring Assisted Closure: Features a dual-spring mechanism that ensures rapid, positive closing upon flow cessation, preventing water hammer and protecting upstream pumps and equipment.
- Low Pressure Drop: The streamlined internal profile and guided disc design minimize flow resistance, optimizing system efficiency and reducing pumping energy costs.
- Bidirectional Sealing Capability: The valve provides reliable sealing in both forward and reverse pressure conditions, a feature essential for complex marine piping layouts.
- Versatile Size Range: Available from DN50 (2") to DN600 (24"), covering the vast majority of marine piping requirements for ballast, bilge, cooling, firefighting, and fuel transfer systems.
Detailed Technical Specifications:
| Parameter | Specification |
| Product Model | CBT4303 Series |
| Body & Trim Material | 316 Stainless Steel (CF8M) |
| Size Range (Nominal Diameter) | DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600 |
| Pressure Rating (Standard) | PN16 (150 lbs), PN25 (300 lbs), PN40 (600 lbs) available upon request |
| Temperature Range | -20°C to +200°C (-4°F to +392°F) |
| Connection Standard | Wafer per ISO 5211, compatible with ANSI B16.5 / DIN / JIS flanges |
| Seat Material | Standard: 316SS Metal Seat; Optional: PTFE Soft Seat for bubble-tight shutoff |
| End Face Finish | Ra 3.2 μm or better, suitable for standard spiral-wound gaskets |
Benefits for Your Marine Operations:
- Enhanced System Reliability: Prevents backflow in ballast, cooling, and bilge systems, ensuring operational safety and compliance with marine classification society rules.
- Reduced Maintenance & Lifetime Cost: The corrosion-resistant 316SS construction and robust design significantly reduce the frequency of replacements and downtime.
- Simplified Inventory & Installation: The standardized wafer design fits common flange standards, simplifying procurement and allowing for faster installation by shipyard crews.
- Global Supply Chain Support: With major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely delivery to shipyards and repair docks worldwide.
Frequently Asked Questions (FAQ):
Q1: Is this check valve suitable for seawater service?
A: Absolutely. The use of 316 stainless steel, particularly the molybdenum-enhanced grade, provides superior resistance to chloride-induced corrosion, making it a preferred choice for seawater, brine, and other aggressive marine media.
Q2: What is the main advantage of a wafer-style check valve over other types?
A: The wafer design offers a compact, lightweight solution that installs directly between two flanges without needing its own bolt holes. This saves considerable space and weight—critical factors in marine applications—and often reduces installation time and cost.
Q3: Can this valve handle vertical installation with upward flow?
A: Yes, the CBT4303 is designed for installation in any orientation, including vertical lines with upward flow. The spring-assisted closing mechanism ensures reliable operation regardless of mounting position.
Q4: What pressure classes are available?
A: Standard offerings include PN16 (150 lbs) and PN25 (300 lbs). For higher pressure requirements up to PN40 (600 lbs), please contact our sales team for a customized solution.
Q5: Are the valves certified by marine classification societies?
A: While our manufacturing process is ISO9001 certified, specific classification society approvals (like ABS, DNV, LR, BV) are typically obtained by the shipyard or project contractor based on their project specifications. We can provide all necessary material documentation (MTC) to support such certification processes.
Q6: What is the lead time for an order of DN200 valves?
A: For standard DN200 valves in PN16/PN25, our typical lead time is 4-6 weeks. Larger sizes or special pressure ratings may require slightly longer. We maintain strategic stock for common sizes to expedite urgent requirements.
Q7: Do you offer different seat materials?
A: Yes. The standard configuration features a metal-to-metal seat (316SS) for durability. For applications requiring bubble-tight shutoff or handling media with fine particles, we offer an optional PTFE soft seat insert.
Q8: How do you ensure quality control?
A: Every valve undergoes a stringent production process under our ISO9001 quality management system. This includes material verification, dimensional checks, pressure testing (shell & seat tests per API 598/ISO 5208), and final inspection before packing.
Backed by our established presence as a manufacturer since 2016 and a proven export track record reaching markets from North America and Europe to Southeast Asia and Africa, the CBT4303 Marine Wafer Check Valve represents a combination of robust engineering and practical value. We invite shipowners, shipyards, and marine equipment distributors to experience the reliability our products deliver. Contact us today for a detailed quotation, technical drawings, or to discuss your specific project requirements.
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