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Home > Industrial Equipment & Components > Valve > Butterfly Valve > Spring Loaded Marine Butterfly Check Valve, CB/T4303 Standard, for Shipboard Seawater and Cooling Water Lines

Spring Loaded Marine Butterfly Check Valve, CB/T4303 Standard, for Shipboard Seawater and Cooling Water Lines

Spring Loaded Marine Butterfly Check Valve, CB/T4303 Standard, for Shipboard Seawater and Cooling Water Lines thumbnail-3

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Spring Loaded Marine Butterfly Check Valve, CB/T4303 Standard, for Shipboard Seawater and Cooling Water Lines thumbnail-5

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Spring Loaded Marine Butterfly Check Valve, CB/T4303 Standard, for Shipboard Seawater and Cooling Water Lines photo-4

Spring Loaded Marine Butterfly Check Valve, CB/T4303 Standard, for Shipboard Seawater and Cooling Water Lines photo-5

Product Spotlights

Integrates butterfly flow control with automatic check valve function in one compact unit for shipboard seawater/cooling lines. Spring-loaded mechanism ensures reliable backflow prevention. Manufactured to CB/T4303 marine standard using corrosion-resistant materials (bronze, stainless steel). ISO9001 certified production. Reduces installation space, components, and cost while protecting critical marine equipment.

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

Key Specifications

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Standard:

CB/T4303 (China Shipbuilding Standard)

Application:

Other, Shipboard Seawater and Cooling Water Lines

Material:

Bronze, Stainless Steel, or Cast Steel

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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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Standard CB/T4303 (China Shipbuilding Standard)

Application Other, Shipboard Seawater and Cooling Water Lines

Material Bronze, Stainless Steel, or Cast Steel

Size Range DN50 to DN300 (2“ to 12“)

Connection Type Flanged

Spring Mechanism Internal Spring for Automatic Closure

Pressure Rating PN10 to PN16

Temperature Range 0°C to 80°C

Optional Features Lockable Handle, Indicator

As a specialized manufacturer of marine valves since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. designs and produces high-performance valves tailored for demanding maritime applications. Our Spring Loaded Marine Butterfly Check Valve, compliant with the CB/T4303 standard, is engineered specifically for reliability in shipboard seawater and cooling water systems. This valve combines the efficient flow characteristics of a butterfly valve with the automatic backflow prevention of a check valve, offering a compact and durable solution that enhances system safety and operational efficiency.

The core value of this product lies in its integrated design, which eliminates the need for separate check and isolation valves, saving space, weight, and installation costs. The internal spring mechanism ensures prompt and positive closure upon flow reversal, protecting pumps, heat exchangers, and other critical equipment from damage. Manufactured under our ISO9001 certified quality management system, this valve is built to withstand the corrosive and high-pressure environments typical of marine service, providing long-term, maintenance-free performance for vessel operators worldwide.

Key Features & Technical Specifications:

Dual-Function Design: Acts as both a flow control (butterfly) valve and a non-return (check) valve, simplifying piping layouts.
Spring-Assisted Closure: An internal torsion spring automatically returns the disc to the closed position when forward flow stops or reverses, ensuring reliable backflow prevention without external power.
CB/T4303 Compliance: Manufactured according to China's shipbuilding technical standards, ensuring material, design, and testing requirements are met for marine applications.
Corrosion-Resistant Materials: Available in bronze, stainless steel (e.g., 304, 316), or cast steel bodies and discs to match specific fluid compatibility and seawater corrosion resistance needs.
Flanged Connections: Standard flanged ends (e.g., ANSI, JIS, DIN patterns available upon request) facilitate secure and leak-free installation into existing piping.
Compact & Lightweight: Compared to traditional swing check valve assemblies, the butterfly check design offers a significantly smaller profile, advantageous in space-constrained engine rooms.
Low Flow Resistance: The butterfly disc design, when open, presents minimal obstruction to flow, reducing pressure drop and improving system efficiency.
Visual Position Indicator: Optional lockable handle or position indicator provides clear visual confirmation of valve status (open/closed).

Detailed Parameters Table:

Parameter	Specification / Range
Standard	CB/T4303
Nominal Diameter (DN)	50, 80, 100, 150, 200, 250, 300 (Other sizes customizable)
Pressure Rating (PN)	10, 16
Body Material	Bronze, Stainless Steel (304/316), Cast Steel
Disc Material	Same as body or coated variants
Seat Material	EPDM, NBR, or PTFE (depending on temperature)
Operating Temperature	0°C to 80°C (Extended range available)
Connection Type	Flanged (Pattern customizable)
Spring Type	Internal torsion spring, stainless steel

Benefits for Your Operations:

Enhanced System Protection: Prevents backflow that can damage pumps, coolers, and filters, reducing maintenance costs and downtime.
Space & Cost Savings: One valve performs two functions, reducing the number of components, pipe fittings, and installation labor required.
Improved Flow Efficiency: Low-pressure drop design helps maintain optimal flow rates in cooling and seawater systems, supporting engine and equipment performance.
Reliable Marine Performance: Built with marine-grade materials and standards, it offers dependable service in challenging saltwater and variable pressure conditions.
Easy Installation & Maintenance: Standard flanged connections and a simple, robust design make installation straightforward and future inspections easier.

Shanghai Zhibang Valve has established a strong reputation since 2016, supported by an ISO9001 certified manufacturing process that guarantees consistent quality. With an annual export value ranging between US$1 Million and US$1.5 Million, our products have gained trust in diverse markets across North America, South America, Europe, Asia, Africa, and Oceania. Our valves are shipped from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring efficient logistics for global clients. This Spring Loaded Marine Butterfly Check Valve embodies our commitment to providing specialized, reliable solutions for the shipping industry. Its compliance with the CB/T4303 standard and adaptable design make it a prudent choice for upgrading or constructing seawater and cooling water lines. We encourage you to contact us for detailed quotations, technical drawings, or to discuss custom requirements tailored to your specific vessel's needs.

Frequently Asked Questions (FAQ):

Q: How does the spring mechanism work in this butterfly check valve?
A: An internal torsion spring is connected to the valve disc. When forward flow pressure decreases or reverses, the spring torque automatically rotates the disc back to the closed position, sealing the flow path. No external actuator or signal is required.
Q: Can this valve be used for other fluids besides seawater and cooling water?
A: Yes, provided the material selection (body, disc, seat) is compatible with the fluid's chemical properties, temperature, and pressure. Consult with our engineers for specific applications like bilge water, fuel oil service water, or other shipboard systems.
Q: Is the CB/T4303 standard recognized internationally?
A: CB/T4303 is a Chinese national standard for shipbuilding, widely accepted and respected in global shipbuilding and repair, particularly in markets sourcing from or operating in Asia. It ensures the valve meets rigorous marine-specific requirements.
Q: What is the difference between this valve and a standard swing check valve?
A: A traditional swing check valve only prevents backflow and requires a separate butterfly or gate valve for flow isolation/regulation. Our product integrates both functions, is more compact, and typically has a lower flow resistance due to the butterfly disc design.
Q: Are custom flange patterns (ANSI, JIS, DIN) available?
A: Yes. While standard production often aligns with common Chinese marine flange standards, we can manufacture valves with specific flange dimensions, face types, and bolt patterns upon request to match your existing piping.
Q: What maintenance is required for this valve?
A: The design is aimed at minimal maintenance. Periodic inspection of the external components and checking for smooth operation is recommended. The spring mechanism and sealing elements are internally protected; however, seat replacement kits are available if needed after extended service.
Q: Does the valve come with a manual override or locking feature?
A: An optional lockable handle or manual override lever can be provided. This allows operators to manually secure the valve in the open or closed position for maintenance or specific operational scenarios.
Q: What is the typical delivery time for standard sizes?
A: For standard DN50-DN300 sizes in common materials, delivery can typically be arranged within 4-6 weeks ex-works, depending on order quantity and current production schedule. Faster delivery may be possible for stock items.