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Home > Industrial Equipment & Components > Valve > Butterfly Valve > CB/T4303 Butterfly Check Valve for Marine Bilge and Ballast Systems, Wafer Design, Corrosion Resistant

CB/T4303 Butterfly Check Valve for Marine Bilge and Ballast Systems, Wafer Design, Corrosion Resistant

CB/T4303 Butterfly Check Valve for Marine Bilge and Ballast Systems, Wafer Design, Corrosion Resistant thumbnail-3

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CB/T4303 Butterfly Check Valve for Marine Bilge and Ballast Systems, Wafer Design, Corrosion Resistant photo-5

Product Spotlights

Marine-grade butterfly check valve designed for bilge/ballast systems. Features compact wafer design for easy flange installation and space/weight savings. Built with corrosion-resistant materials (coated iron body, stainless steel disc) for longevity in seawater. Ensures reliable one-way flow to prevent backflow and protect pumps. Manufactured to CB/T 4303 marine standard, offering a durable, low-maintenance solution for vessel safety and efficiency.

Negotiable MOQ: 1 Unit (Price negotiable depending on order volume and customization)

Key Specifications

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Application:

Other, Marine Bilge & Ballast Systems

Standard:

CB/T 4303, Marine Standard

Type:

Butterfly Check Valve, Non-Return Valve

Contact Supplier Request Quote Chat Now

Shanghai Zhibang Valve Manufacture Co.,ltd

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
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Application Other, Marine Bilge & Ballast Systems

Standard CB/T 4303, Marine Standard

Type Butterfly Check Valve, Non-Return Valve

Design Wafer Type, Lugged Body

Body Material Corrosion Resistant Cast Iron/Ductile Iron

Disc Material Stainless Steel or Corrosion Coated

Seat Material EPDM, NBR, or Viton

Connection Wafer Style, Between Flanges

Size Range DN50 to DN600 (2“ to 24“)

Pressure Rating PN10, PN16, Class 150

As a leading manufacturer with a strong focus on marine fluid control solutions, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our CB/T4303 Butterfly Check Valve, engineered specifically for the demanding environments of marine bilge and ballast systems. With our ISO9001-certified production processes and a commitment to quality since 2016, we deliver valves that combine reliability with superior corrosion resistance. This wafer-design valve is a critical component for preventing backflow, ensuring the safety and operational integrity of vessels worldwide. We understand the challenges of marine applications, which is why our valve is built to withstand harsh seawater conditions, offering a durable and maintenance-friendly solution for shipbuilders and marine engineers.

The core value of our butterfly check valve lies in its effective one-way flow control and robust construction. Its compact wafer design allows for easy installation between existing pipeline flanges, saving significant space and weight compared to conventional check valves – a crucial advantage in marine engineering where every kilogram matters. The valve's disc closes automatically upon flow reversal, providing a tight seal to protect pumps and other upstream equipment from damage caused by backflow. This automatic operation requires no external power or manual intervention, enhancing system reliability.

Key Product Features & Technical Advantages:

Superior Corrosion Resistance: The valve body is typically constructed from corrosion-resistant cast iron or ductile iron, often with specialized coatings like epoxy or nickel plating. The disc and internal components utilize stainless steel (e.g., 304, 316) or other corrosion-resistant alloys, ensuring long service life in saltwater bilge and ballast environments.
Compact & Lightweight Wafer Design: The lugged wafer body installs directly between ANSI or DIN standard flanges using through-bolts. This eliminates the need for separate valve flanges, reducing overall weight, installation time, and cost.
Low Pressure Drop & High Flow Capacity: The streamlined disc design minimizes flow restriction when open, ensuring efficient pumping and reducing energy consumption for bilge and ballast pumps.
Bubble-Tight Sealing: Utilizes a resilient seat (options include EPDM, NBR, or Viton) that provides excellent sealing against both low and high-pressure backflow, preventing system contamination and ensuring operational safety.
Durable & Low Maintenance: Simple construction with minimal moving parts translates to high reliability and reduced maintenance requirements. The materials are selected for wear resistance and compatibility with seawater and typical marine fluids.
Compliance with Marine Standards: Manufactured in accordance with the Chinese CB/T 4303 standard for marine valves, ensuring it meets specific requirements for design, materials, and testing relevant to maritime applications.

Technical Specifications Table:

Parameter	Specification / Option
Product Standard	CB/T 4303
Valve Type	Butterfly Check Valve (Swing Check Type)
Connection Type	Wafer, Lugged Body
Nominal Diameter (DN)	50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600
Pressure Rating	PN10, PN16, Class 150
Body Material	Corrosion Resistant Cast Iron, Ductile Iron (Optional coatings: Epoxy, Ni-plated)
Disc Material	Stainless Steel 304/316, Coated Carbon Steel
Seat Material	EPDM (Standard), NBR, Viton (FKM) upon request
Operating Temperature	-10°C to +120°C (depends on seat material)
Applicable Media	Seawater, Bilge Water, Ballast Water, Oily Water, Fresh Water

Benefits for Your Marine Projects:

Enhanced System Safety: Prevents dangerous backflow in bilge and ballast lines, protecting pumps and preventing potential flooding or stability issues.
Reduced Installation & Lifecycle Cost: The wafer design lowers installation labor and material costs. Durability leads to fewer replacements and lower maintenance expenses.
Space and Weight Savings: Ideal for engine rooms and tight spaces aboard ships, contributing to better vessel design and fuel efficiency.
Reliable Performance: Consistent operation under varying flow conditions ensures your marine systems function as intended, voyage after voyage.
Global Supply Compatibility: Designed to fit standard flange dimensions, making it suitable for both new builds and retrofit projects on vessels worldwide.

Trust in a product backed by a manufacturer with a proven global track record. Shanghai Zhibang Valve has been serving a diverse international clientele across North America, South America, Europe, Asia, Africa, and Oceania since 2016, with an annual export value demonstrating our capacity and reliability. Our valves are shipped efficiently from major ports like Shanghai, Guangzhou, and Hong Kong. We stand behind the quality of our CB/T4303 Butterfly Check Valve, a component designed to meet the rigorous demands of the marine industry. For a reliable, corrosion-resistant, and space-saving solution for your bilge and ballast systems, contact us today to discuss your specifications or request a detailed quotation.

Frequently Asked Questions (FAQ)

What is the main purpose of this valve on a ship?
This butterfly check valve is specifically designed to allow fluid flow in one direction only within marine bilge and ballast piping systems. Its primary function is to automatically prevent backflow, which protects pumps from damage, maintains system pressure, and ensures the correct operation of ballast and bilge management for vessel stability and safety.
How does the 'wafer design' benefit installation?
The wafer design means the valve body is compact and fits directly between two pipeline flanges using long bolts that pass through both flanges and the valve's lugs. This eliminates the need for the valve to have its own flanges, resulting in a lighter, more space-efficient assembly that is generally easier and faster to install compared to flanged check valves.
What materials make it 'corrosion resistant' for marine use?
Corrosion resistance is achieved through material selection and coatings. The body is often made from corrosion-resistant cast/ductile iron with protective epoxy or nickel coatings. Internal parts like the disc and shaft are typically stainless steel (304 or 316). The seat is a chemically resistant elastomer like EPDM, suitable for seawater.
Is this valve suitable for both bilge and ballast water?
Yes, it is engineered for both applications. The materials are selected to handle seawater, which is common in ballast systems, as well as the potentially oily or debris-laden water found in bilge systems. The specific seat material can be chosen based on the exact media and temperature.
What does 'CB/T 4303' mean, and is it recognized internationally?
CB/T is a Chinese industry standard ("T" often stands for "推荐" or recommended) for shipbuilding. CB/T 4303 specifies requirements for marine valves. While it is a Chinese standard, it is widely recognized and accepted in international shipbuilding, especially for vessels built in or sourcing components from Asia. It ensures the valve meets specific marine-grade requirements.
Can this valve be installed in any orientation?
For optimal performance and to ensure the disc closes properly by gravity, it is recommended to install the valve in a horizontal pipeline with the disc shaft horizontal. Installation in vertical lines is possible but should be evaluated based on flow direction and pressure; consulting the manufacturer for specific guidance is advised.
What maintenance does this valve require?
These valves are designed for low maintenance. Periodic external inspection for leaks and corrosion is recommended. Internally, the seat and disc may require inspection during dry-docking schedules. The simple design means seat replacement, if ever needed, is relatively straightforward.
Do you offer different sizes and pressure ratings?
Yes, we offer a standard size range typically from DN50 (2") up to DN600 (24"). Common pressure ratings are PN10, PN16, and Class 150. Other sizes and pressure classes may be available upon request for custom projects.