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Help CenterWafer Type Marine Check Valve Compliant With CB/T4303, Dual Plate Design, Cast Steel Construction
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As a specialized manufacturer of industrial valves since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to introduce our high-performance Wafer Type Marine Check Valve. Engineered specifically to meet the demanding requirements of marine and offshore applications, this valve is designed to prevent backflow and protect critical pipeline systems with reliability and efficiency. Our commitment to quality, evidenced by our ISO9001 certification, ensures that every valve delivers consistent performance under harsh operating conditions. This dual-plate design, constructed from durable cast steel and compliant with the CB/T4303 standard, represents a robust solution for shipbuilding, offshore platforms, and coastal industrial facilities seeking dependable flow control.
The core value of this valve lies in its ability to provide unidirectional flow assurance with minimal pressure drop and a compact, space-saving design. Its construction and features are tailored for the marine environment.
- Dual Plate (Double Door) Design: Features two spring-assisted hinged plates that open with forward flow and snap shut instantly upon flow reversal. This design offers faster closing times compared to single-plate valves, minimizing water hammer effects.
- Cast Steel Construction: The valve body and plates are manufactured from quality cast steel (such as WCB), providing excellent strength, corrosion resistance, and longevity in seawater and other corrosive marine media.
- Wafer Type Installation: The valve is installed between two pipeline flanges using through-bolts, eliminating the need for additional flange connections on the valve itself. This results in a lighter, more compact, and cost-effective installation.
- CB/T4303 Compliance: Manufactured in accordance with China's CB (Shipbuilding) standards, specifically CB/T4303 for marine wafer check valves, ensuring it meets recognized specifications for marine use.
- Versatile Sealing Options: The seat ring can be furnished with different seal materials (like Stainless Steel or NBR) based on the fluid service temperature and chemical compatibility requirements.
- Low Maintenance: The simple, robust design with minimal moving parts translates to high reliability and reduced maintenance needs, a critical factor for marine operations.
The technical specifications of our Wafer Type Marine Check Valve can be customized to suit various project requirements. Below is a table outlining common standard specifications:
| Parameter | Specification / Option |
| Valve Type | Wafer, Dual Plate Check Valve |
| Size Range | DN50 to DN600 (2" to 24") |
| Pressure Rating | PN10, PN16, PN25, PN40 (Customizable) |
| Body Material | Cast Steel (WCB), other grades available upon request |
| Disc/Plate Material | Cast Steel + Stainless Steel Trim |
| Seat Seal Material | Stainless Steel (Standard for H76H), NBR (Optional for H76W) |
| Applicable Medium | Water, Seawater, Oil, Gas, Steam (compatible with seat material) |
| End Connection | Wafer, RTJ (Ring Type Joint) face optional |
| Operation | Automatic (Flow-dependent) |
Choosing our valve provides distinct advantages for your marine projects. The compact wafer design saves significant space and weight on board vessels or platforms, where these factors are paramount. Compliance with CB/T4303 gives engineers and procurement teams confidence in its suitability for marine service. Furthermore, the dual-plate mechanism ensures quick, positive sealing, protecting pumps and other upstream equipment from damage due to backflow. The use of cast steel offers a favorable balance of mechanical properties and cost for widespread marine use.
Shanghai Zhibang Valve backs this product with a proven track record. Our valves are trusted in global markets, including North America, Europe, Southeast Asia, and the Middle East, with an annual export value ranging between US$1 Million and US$1.5 Million. Our ISO9001 certified manufacturing processes guarantee consistent quality control from raw material inspection to final testing. We support flexible shipment from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing to ensure timely delivery worldwide. For your next marine or offshore project requiring reliable backflow prevention, consider our Wafer Type Marine Check Valve—a product built to perform and endure. Contact us today for detailed quotations, technical data sheets, or to discuss custom requirements.
Frequently Asked Questions (FAQ):
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Q: What is the main advantage of a wafer-type check valve over a flanged-end type?
A: The wafer type is installed between two flanges, making it lighter, more compact, and often more economical than a flanged-end valve which has its own flanges. It saves space and reduces the total number of bolted connections. -
Q: Can this valve be installed in any orientation?
A: For optimal performance and to ensure proper closing by gravity and spring force, installation in a horizontal pipeline is recommended. Vertical installation (with upward flow) is possible but should be confirmed based on specific spring selection and application details. -
Q: What does compliance with CB/T4303 mean?
A: CB/T4303 is a Chinese professional standard for "Marine wafer type check valves." Compliance indicates the valve's design, materials, dimensions, and testing procedures conform to specifications recognized for marine and shipbuilding applications. -
Q: Is the valve suitable for seawater service?
A: Yes, the cast steel body with appropriate corrosion protection and the option for stainless steel sealing surfaces makes it suitable for seawater. Material specifications should be confirmed based on specific water chemistry and temperature. -
Q: What is the difference between the H76W and H76H model designations?
A: Typically, "H76W" indicates a valve with a soft seal (like NBR), while "H76H" indicates a metal-to-metal seal (Stainless Steel). The choice depends on the fluid temperature, pressure, and required sealing tightness. -
Q: Do you offer different pressure classes like ANSI?
A: Yes. While the standard is PN (DIN/ISO), we can manufacture valves to ANSI pressure classes (e.g., 150#, 300#) based on customer requirements. Please specify your needed standard during inquiry. -
Q: How do you test the valve before shipment?
A: Each valve undergoes a shell test (body pressure test) and a seat leakage test according to relevant standards. Test reports can be provided upon request. -
Q: Can the spring force be adjusted for different flow conditions?
A: The spring is pre-set for standard conditions. For applications with very low pressure or specific closing characteristics, spring options can be discussed and customized.
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