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Help CenterCB/T4303 Butterfly Check Valve for Bilge and Ballast Systems
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As a leading manufacturer with ISO9001-certified quality management, Shanghai Zhibang Valve is dedicated to providing robust and reliable fluid control solutions for the marine industry. Our CB/T4303 Butterfly Check Valve is engineered specifically for the demanding environments of bilge and ballast systems, offering superior backflow prevention to protect vital shipboard equipment and ensure operational safety. This valve combines a compact, lightweight design with dependable sealing performance, making it an essential component for modern vessel piping networks.
This valve features a simple yet effective butterfly disc design that opens with forward flow and closes automatically to prevent reverse flow. Its spring-assisted mechanism ensures quick, positive closure, minimizing water hammer and protecting pumps and other upstream components. Manufactured to the CB/T4303 standard, it is designed to meet the rigorous requirements of marine applications.
- Reliable Backflow Prevention: The primary function is to automatically prevent the reversal of fluid flow in bilge and ballast lines, safeguarding pumps and maintaining system integrity.
- Compact & Lightweight Design: The wafer-style body offers significant space and weight savings compared to traditional swing check valves, crucial for shipboard installations.
- Low Pressure Drop: The streamlined disc design creates minimal flow resistance when open, contributing to system efficiency and reducing pump energy consumption.
- Durable Construction: Available in a variety of material combinations to withstand corrosive seawater, bilge water, and the mechanical stresses of marine service.
- Easy Installation & Maintenance: The wafer design allows for installation between standard pipe flanges without the need for additional gaskets in many cases, simplifying the process. Internal components are accessible for inspection or replacement.
- Versatile Mounting: Can be installed in horizontal or vertical pipelines (with flow direction upward), providing flexibility in system layout.
Below is a summary of key technical specifications for our standard range:
| Parameter | Specification |
| Design Standard | CB/T4303 |
| Nominal Diameter (DN) | 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800 |
| Pressure Rating | PN10, PN16, Class 150 |
| Body Material (Common) | Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel 316 |
| Disc Material (Common) | Stainless Steel 316, Aluminum Bronze |
| Seat Material (Common) | EPDM (for water), NBR, PTFE, Metal |
| Connection Type | Wafer, Double Flanged, Lugged |
| Temperature Range | -10°C to +120°C (depends on seat material) |
The valve's spring is calibrated to ensure closure before reverse flow begins, a critical feature for preventing slam. For bilge systems, this prevents backflow that could flood compartments. In ballast systems, it maintains the intended water distribution for vessel stability and trim. Our manufacturing process includes rigorous pressure testing and inspection to ensure every valve meets performance expectations.
With an annual export value reflecting our global reach, Shanghai Zhibang Valve has established trust with partners across North America, South America, Europe, Asia, Africa, and Oceania. Our ISO9001 certification underpins our commitment to consistent quality, from material sourcing to final shipment from major ports like Shanghai, Guangzhou, and Hong Kong. This valve is not just a component; it's a safeguard for your vessel's critical systems. Contact us today to discuss your specific requirements for bilge and ballast check valves, and let our expertise provide a reliable solution for your fleet.
Frequently Asked Questions (FAQ)
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Q: What is the main purpose of this butterfly check valve in marine systems?
A: Its primary purpose is to allow fluid flow in one direction and automatically prevent reverse flow (backflow) in bilge and ballast piping systems. This protects pumps from damage and maintains the intended operation of these critical systems. -
Q: How does this valve differ from a standard swing check valve?
A: The butterfly check valve has a more compact, lighter wafer-style design and typically uses a spring to assist in rapid closure, which can reduce water hammer. Swing check valves are larger, heavier, and rely more on gravity and reverse flow for closure. -
Q: Can this valve be installed in any orientation?
A: It can be installed in both horizontal and vertical pipelines. For vertical installation, the flow direction must be upward to allow the disc to open properly against gravity and spring force. -
Q: What material choices are recommended for seawater ballast service?
A: For optimal corrosion resistance in seawater, we recommend a body and disc made of stainless steel (e.g., 316/316L) or aluminum bronze, paired with an EPDM or PTFE seat. Other material combinations are available upon request. -
Q: Is the spring inside the valve adjustable or replaceable?
A: The spring is pre-calibrated for specific pressure ratings and is not field-adjustable. It is, however, a replaceable component during maintenance if required. -
Q: Do you provide custom sizes or pressure ratings outside the standard range?
A: Yes, as a manufacturer, we have the capability to produce valves in non-standard sizes and for higher pressure classes based on customer specifications and engineering review. -
Q: What testing is performed on these valves before shipment?
A: Each valve undergoes a shell test and a seat leakage test according to relevant standards to verify pressure containment and sealing performance under both open and closed conditions. -
Q: What is the typical lead time for an order?
A: Lead time depends on the order quantity and specification. Standard configurations are often available from stock or have shorter production cycles. We provide specific lead time quotes upon receipt of your inquiry.
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