ALL CATEGORIES

Seller Center
- Product Management
  
  Post Product
  
  Manage Products
  
  Featured Products
- Blog Management
  
  Post Blog Article
  
  Manage Blog Articles
  
  Manage Blog Categories
- Inquiry Management
  
  My Inquiries
  
  Buying Requests
- Analytics Center
  
  Performance Dashboard
  
  Product Analytics
  
  Visitor Analytics
Connect Your Store to WeChat

Follow Our Official Service Account
Manage Products & Inquiries Anywhere
Seller Services

Seller Services

Goldsupplier.com: 20 years of Global Trade Expertise, Empowering Your Business to Go Global!

Join GoldSupplier.com

Free & Instant Registration

Showcase Company & Products

Access Global Buying Requests

Register Now

Activate Verified Supplier Membership

Priority Verified Visibility

Claim Exclusive Buying Requests

Automated Multi-language Store

Verified Now

Launch Your EasyOcean Website

Full-Service Website Management

Google Page 1 Guarantee

Enhanced Brand Credibility

Launch Now
Buyer Services
Post Buying Request

Browse Product Categories

Featured Suppliers
Contact Platform Support

Help Center

Home > Industrial Equipment & Components > Valve > Other Valves & Parts > Marine Butterfly Check Valve, Cast Steel Body With Nitrile Rubber Seat, CB/T4303, PN16 Pressure

Marine Butterfly Check Valve, Cast Steel Body With Nitrile Rubber Seat, CB/T4303, PN16 Pressure

Marine Butterfly Check Valve, Cast Steel Body With Nitrile Rubber Seat, CB/T4303, PN16 Pressure thumbnail-3

Marine Butterfly Check Valve, Cast Steel Body With Nitrile Rubber Seat, CB/T4303, PN16 Pressure thumbnail-4

Marine Butterfly Check Valve, Cast Steel Body With Nitrile Rubber Seat, CB/T4303, PN16 Pressure thumbnail-5

Marine Butterfly Check Valve, Cast Steel Body With Nitrile Rubber Seat, CB/T4303, PN16 Pressure photo-1

Marine Butterfly Check Valve, Cast Steel Body With Nitrile Rubber Seat, CB/T4303, PN16 Pressure photo-2

Marine Butterfly Check Valve, Cast Steel Body With Nitrile Rubber Seat, CB/T4303, PN16 Pressure photo-3

Marine Butterfly Check Valve, Cast Steel Body With Nitrile Rubber Seat, CB/T4303, PN16 Pressure photo-4

Marine Butterfly Check Valve, Cast Steel Body With Nitrile Rubber Seat, CB/T4303, PN16 Pressure photo-5

Product Spotlights

Marine-grade butterfly check valve with cast steel body and nitrile rubber seat, compliant with CB/T4303 standard and rated for PN16 pressure. Features a compact, dual-plate design for automatic, non-slam closure to prevent backflow and water hammer in ship piping systems. Offers space-saving installation, low maintenance, and reliable performance for ballast, cooling, and other critical marine applications.

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

Key Specifications

Get Latest Price

Body Material:

Cast Steel

Seat Material:

Nitrile Rubber (NBR)

Standard:

CB/T4303

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
Company Profile
Contact Us

Body Material Cast Steel

Seat Material Nitrile Rubber (NBR)

Standard CB/T4303

Pressure Rating PN16

Connection Type Wafer or Lug (Optional)

Application Marine, Shipbuilding, Offshore Platforms

Operation Automatic, Non-Slam

Size Range DN50 to DN600 (2“ to 24“)

Temperature Range -20°C to +80°C

Design Type Butterfly, Dual-Plate, Non-Return

As a professional manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in providing high-performance and reliable fluid control solutions for the demanding marine industry. Established in 2016, we have built a solid reputation by exporting our products to over 14 major global markets, including North America, Southeast Asia, and Europe. Our Marine Butterfly Check Valve, designed and manufactured in strict compliance with the CB/T4303 standard, represents our commitment to quality and engineering excellence. This valve is specifically engineered to prevent backflow in ship piping systems, offering a robust, compact, and maintenance-friendly solution that ensures operational safety and system integrity in harsh maritime environments.

This valve combines a durable cast steel body with a resilient nitrile rubber seat, creating a perfect balance between strength and sealing performance. Its butterfly-style, dual-plate design allows for quick, automatic closure upon flow reversal, effectively preventing water hammer and protecting pumps and other critical equipment. Below, we detail its key features, technical specifications, and the distinct advantages it brings to your marine applications.

Core Features & Technical Advantages:

Superior Construction for Marine Duty: The valve body is crafted from high-grade cast steel, offering exceptional resistance to corrosion, pressure (PN16), and the mechanical stresses encountered in shipboard service. The nitrile rubber (NBR) seat provides excellent sealing against seawater, oils, and a wide range of other fluids commonly found in marine systems.
Compact & Lightweight Design: Compared to traditional swing check valves, the butterfly check valve features a significantly more compact profile and lower weight. This saves crucial space and simplifies installation in the confined machinery spaces of vessels, from cargo ships to offshore platforms.
Non-Slam, Low-Pressure Drop Operation: The dual-plate design ensures a swift and smooth closure mechanism. The plates close under spring-assisted action before reverse flow fully develops, minimizing the risk of damaging water hammer and associated noise. The streamlined flow path also results in a very low pressure drop, enhancing overall system efficiency.
Versatile Installation & Configuration: Available in both wafer and lug body styles to suit different piping connection requirements. The lug style allows for easy installation between flanges without the need for long through-bolts, which is a significant advantage for maintenance. Sizes are comprehensive, covering a standard range to fit various system diameters.
Minimal Maintenance Requirements: With no complex external linkages or actuators (operates automatically based on flow), the valve has fewer moving parts prone to wear. The robust seat and disc design ensure long service life with minimal intervention, reducing downtime and lifecycle costs.

Detailed Technical Specifications:

Parameter	Specification
Design & Manufacturing Standard	CB/T4303 (Chinese Ship Standard)
Pressure Rating	PN16
Body Material	Cast Steel (WCB or equivalent)
Seat/Disc Sealing Material	Nitrile Rubber (NBR)
Disc Material	Stainless Steel (e.g., 304/316) or Coated Carbon Steel
Connection Type	Wafer or Lug (Optional)
Nominal Diameter (DN)	50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600
Temperature Range	-20°C to +80°C (Standard NBR Seat)
Suitable Media	Sea Water, Fresh Water, Oils, Air, and other non-aggressive fluids

Benefits for Your Operations:

Enhanced System Protection: Prevents reverse flow that can damage pumps, compressors, and other equipment, ensuring continuous and safe operation of ballast, cooling, firefighting, and bilge systems.
Space and Cost Savings: The compact design reduces the footprint and weight of the piping system, which can lead to material savings and more flexible ship design.
Improved Reliability: Built to marine standards with quality materials, this valve offers dependable performance that shipowners and operators can trust for critical applications.
Global Compliance: Manufactured according to the recognized CB/T4303 standard, making it a suitable choice for vessels requiring components that meet specific marine engineering guidelines.

Backed by our ISO9001-certified quality management system and an annual export value reflecting consistent global trust, Shanghai Zhibang Valve stands as a reliable partner for your marine valve needs. Our products are shipped from major ports like Shanghai, Guangzhou, and Hong Kong, ensuring efficient logistics to your location worldwide. Choose our Marine Butterfly Check Valve for a combination of robust construction, intelligent design, and proven performance. Contact us today to discuss your project requirements, request a detailed quotation, or learn more about our full range of marine valve solutions.

Frequently Asked Questions (FAQ):

Q: What is the main advantage of a butterfly check valve over a swing check valve for marine use?
A: The primary advantages are its compact size, lighter weight, and faster closing action which helps prevent water hammer. These features are particularly valuable in the space-constrained and vibration-prone environments onboard ships.
Q: Is the Nitrile Rubber (NBR) seat suitable for seawater applications?
A: Yes, NBR offers good resistance to seawater, oils, and many hydrocarbons, making it a common and reliable choice for standard marine service. For specific media or higher temperatures, alternative seat materials like EPDM or Viton may be available upon request.
Q: What does the "PN16" pressure rating mean?
A: PN16 indicates a nominal pressure rating of 16 bar at room temperature (20°C). This means the valve is designed to safely handle working pressures up to 16 bar in the specified temperature range.
Q: Can this valve be installed in any orientation?
A: Yes, one of the benefits of this dual-plate butterfly check valve design is that it can be installed in horizontal or vertical pipelines without affecting its function, providing great installation flexibility.
Q: Do you offer valves with different end connections besides wafer type?
A: Yes. This model is typically available in both wafer and lug styles. The lug style has threaded inserts, allowing it to be installed using bolts on one side only, which is beneficial for system maintenance.
Q: What is the significance of the CB/T4303 standard?
A: CB/T4303 is a Chinese national professional standard specifically for shipbuilding, covering butterfly check valves. It defines requirements for design, materials, manufacturing, testing, and inspection to ensure suitability for marine applications.
Q: Are spare parts like the seat or disc available for purchase?
A: Yes, as the manufacturer, we maintain an inventory of critical spare parts. We recommend keeping a set of common wear parts on hand to minimize downtime during maintenance.
Q: What is your typical lead time for an order of these valves?
A: Lead time varies based on order quantity, size, and specific configuration. Standard sizes are often available from stock or have shorter production cycles. Please contact our sales team with your detailed requirements for an accurate delivery schedule.