Contact Platform Support
Help Center
Home > Industrial Equipment & Components > Valve > Butterfly Valve > CB/T4303 Marine Check Valve For Oil, Cast Steel Body With NBR Seal DN50-DN300
CB/T4303 Marine Check Valve For Oil, Cast Steel Body With NBR Seal DN50-DN300
Product Spotlights
CB/T 4303 standard marine check valve designed for oil systems. Features a durable cast steel body for strength and corrosion resistance, paired with an oil-resistant NBR seal for reliable, long-lasting performance. Available in a comprehensive range from DN50 to DN300 to fit various pipeline needs. Ensures safe, unidirectional flow to protect marine equipment. Customizable options for materials and flange standards are available to meet specific project requirements.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
Get Latest Price
Application:
Other, Marine Oil Systems
Material (Body):
Cast Steel
Seal Material:
NBR (Nitrile Rubber)
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
Related Products
-
Marine Oil Check Valve CB/T4303, Cast Steel Construction, PN4.0MPa Pressure RatingNegotiableMOQ: 1 Unit -
CB/T4303 Marine Oil Check Valve With Mill Test Report and 2-Year WarrantyNegotiableMOQ: 1 Unit
-
Marine Check Valve Standard Compliant With CB/T4303, Includes Installation SupportNegotiableMOQ: 1 Unit
-
Wafer Type Marine Check Valve for Oil, Compliant With CB/T4303 Standard, DN300 SizeNegotiableMOQ: 1 Unit
-
Marine Check Valve for Lube Oil Systems, Engine Room Application, CB/T4303 StandardNegotiableMOQ: 1 Unit
Application
Other, Marine Oil Systems
Material (Body)
Cast Steel
Seal Material
NBR (Nitrile Rubber)
Nominal Diameter (DN)
DN50 to DN300
Product Standard
CB/T 4303
Connection Type
Flanged (Standard)
Pressure Rating
Available upon request
Temperature Range
Suitable for marine environments
Body Style
Globe or Wafer (Customizable)
Surface Treatment
Optional coatings available
As a professional manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in producing high-performance marine valves tailored for demanding offshore and shipboard applications. Our CB/T 4303 Marine Check Valve for Oil, featuring a robust cast steel body and a reliable NBR seal, is engineered to prevent backflow and ensure the safety and efficiency of your marine oil systems. With nearly a decade of experience since our establishment in 2016, we have supplied our valves to key markets worldwide, including North America, Southeast Asia, and Europe, building a reputation for durability and precision in marine engineering.
This valve is designed to meet the rigorous standards of marine operations, offering exceptional resistance to corrosion, pressure surges, and the harsh conditions found at sea. Its primary function is to allow fluid flow in one direction while automatically preventing reverse flow, which is critical for protecting pumps, compressors, and other vital equipment in oil transfer lines, fuel systems, and bilge systems. The combination of materials and design ensures long service life with minimal maintenance, reducing operational downtime and costs for ship operators and offshore platform managers.
Key Features & Technical Advantages:
- Superior Material Construction: The valve body is manufactured from high-grade cast steel, providing excellent mechanical strength and impact resistance. This material is chosen for its ability to withstand high pressures and corrosive elements commonly encountered in marine oil applications.
- Reliable Sealing Performance: The seal is made from Nitrile Butadiene Rubber (NBR), a material known for its excellent oil resistance, flexibility, and durability across a wide temperature range. This ensures a tight seal even after prolonged exposure to hydrocarbons.
- Compliant Design: The valve is produced in accordance with the Chinese CB/T 4303 standard, which specifies requirements for marine valves, ensuring compatibility and reliability within marine piping systems.
- Wide Size Range: Available in nominal diameters from DN50 (2") to DN300 (12"), offering flexibility for various pipeline configurations and flow capacity requirements on vessels and offshore installations.
- Optimized Flow Design: The internal design minimizes pressure drop and turbulence, promoting efficient fluid flow and reducing energy consumption for associated pumping systems.
- Robust Hinge Mechanism: Features a sturdy hinge pin and disc assembly that allows for quick, positive closure upon flow reversal, preventing water hammer and protecting upstream equipment.
- Easy Installation & Maintenance: Standard flanged connections facilitate straightforward installation. The design may allow for in-line servicing without complete removal from the pipeline, depending on the specific model configuration.
- Customization Options: While the standard model includes cast steel and NBR, alternative materials for the body (e.g., stainless steel, cast iron) and seals (e.g., Viton, EPDM) are available upon request to suit specific fluid media or environmental conditions.
Technical Specifications Table:
| Parameter | Specification / Details |
| Product Standard | CB/T 4303 |
| Nominal Diameter (DN) | DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300 |
| Body Material | Cast Steel (Standard) |
| Seal Material | NBR (Nitrile Rubber) |
| Connection Type | Flanged (RF or FF faces customizable) |
| Pressure Class | PN10 to PN40 (Specific rating available upon request) |
| Suitable Medium | Marine Fuel Oils, Lubricating Oils, Crude Oil (non-aggressive), Bilge Water with oil content |
| Mounting Orientation | Horizontal or Vertical (flow direction upward) |
Benefits for Your Operations:
- Enhanced System Safety: Prevents dangerous backflow in oil systems, mitigating risks of contamination, overpressure, and equipment damage.
- Reduced Maintenance Costs: The durable cast steel body and oil-resistant NBR seal are built to last, decreasing the frequency of replacements and associated labor costs.
- Operational Reliability: Ensures consistent, uninterrupted flow direction, which is vital for the automated and often remote-controlled systems on modern vessels.
- Regulatory Compliance: Adherence to the CB/T 4303 standard supports compliance with many marine equipment specifications, simplifying the approval process for shipbuilders and repair yards.
- Global Supply Chain Support: With major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we offer flexible logistics to get your valves to shipyards and ports worldwide efficiently.
Our commitment to quality is underscored by our ISO9001-certified manufacturing processes, ensuring every valve that leaves our Shanghai facility meets stringent performance criteria. With an annual export value reflecting consistent global demand, our products have proven their worth across diverse marine sectors from Eastern Europe to Oceania. Choosing our CB/T 4303 Marine Check Valve means investing in a component backed by professional engineering, reliable manufacturing, and a track record of satisfying international clients. We encourage you to contact us with your specific DN size, pressure rating, and any customization needs to receive a detailed quotation and technical support.
Frequently Asked Questions (FAQ)
-
Q: Is this check valve suitable for seawater applications?
A: While designed for oil systems, the cast steel body offers good corrosion resistance. For direct seawater service, specifying alternative materials like bronze or stainless steel for the body and a different seal material would be recommended. Please inquire for a customized solution. -
Q: What is the main advantage of the NBR seal in this application?
A: Nitrile Rubber (NBR) is highly resistant to oils, fuels, and hydrocarbons, making it an ideal sealing material for marine oil pipelines. It maintains its elasticity and sealing properties over a typical marine operating temperature range. -
Q: Can you provide valves with different flange standards, like ANSI or JIS?
A: Yes, customization is available. While the standard follows dimensions typical for CB/T standards, we can manufacture valves with ANSI, DIN, JIS, or other flange face and drilling specifications upon request. Please provide the required standard when inquiring. -
Q: What is the typical lead time for an order of DN200 valves?
A: Lead times depend on order quantity and current production schedule. For standard DN200 valves in cast steel with NBR seals, typical lead times range from 4-6 weeks. We provide more accurate timelines upon receipt of your formal inquiry. -
Q: Does the valve come with any documentation or certification?
A: As an ISO9001-certified manufacturer, we provide a material certificate (CMTR) for the body and seal materials, along with a standard inspection report. Specific marine classification society certifications (e.g., ABS, DNV, LR) can be arranged as an optional service. -
Q: What maintenance does this check valve require?
A: Designed for minimal maintenance, periodic external inspection for leaks and listening for proper operation (quiet closure) is recommended. Depending on the model, the internal disc and seal may be accessible for inspection or replacement without removing the entire valve body from the line. -
Q: Are spare parts like seals available for purchase separately?
A: Yes, we supply spare part kits containing the NBR seal, hinge pin, and disc assembly. Using genuine spare parts ensures optimal performance and longevity of your valve. -
Q: How do I determine the correct pressure rating (PN) for my application?
A: The required pressure class depends on your system's maximum working pressure. We offer a range from PN10 to PN40. Please provide your system's design pressure and any relevant safety factors, and our engineers can recommend the appropriate rating.
Send Inquiry to This Supplier
1Yr
Business Type
Manufacturer
Year Established
2016
Annual Export Value
US$1 Million - US$1.5 Million
Product Certifications
ISO9001
You May Also Like
-
CB/T4303 Standard Marine Check Valve, For Shipboard Oil Pipelines, PN1.6-4.0MPaNegotiableMOQ: 1 Unit
-
Marine Check Valve CB/T4303, Cast Steel Body NBR Seal for Oil Service DN50-DN300NegotiableMOQ: 1 Unit
-
CB/T4303 Swing Check Valve for Marine Seawater Applications, 200mm to 600mm Size RangeNegotiableMOQ: 1 Unit
-
CB/T4303 Marine Check Valve With Extended Warranty for Seawater Corrosion ResistanceNegotiableMOQ: 1 Unit
-
CB/T4303 Wafer Type Marine Check Valve, DN50 to DN600, Designed for Seawater ServiceNegotiableMOQ: 1 Unit
-
CB/T4303 Seawater Check Valve Supplied With Full Material Traceability DocumentationNegotiableMOQ: 1 Unit
-
Marine Engine Room Seawater Line Check Valve, CB/T4303 Standard, Wafer ConnectionNegotiableMOQ: 1 Unit
-
Cast Iron Marine Check Valve for Seawater Piping, CB/T4303 Compliant, PN16 Pressure RatingNegotiableMOQ: 1 Unit
-
Marine Seawater Check Valve With Mill Test Report, Manufactured to CB/T4303 SpecificationNegotiableMOQ: 1 Unit
-
CB/T4303 Check Valve for Seawater Cooling Systems on Marine VesselsNegotiableMOQ: 1 Unit
