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Help CenterMarine Check Valve CB/T4303, Cast Steel Body NBR Seal for Oil Service DN50-DN300
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As a professional manufacturer with a focus on industrial valve solutions, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our specialized Marine Check Valve compliant with the CB/T4303 standard. Engineered for reliability in demanding oil service applications, this valve series combines a robust cast steel body with a durable NBR (Nitrile Rubber) seal to ensure secure backflow prevention and long-term performance in marine and offshore environments. Our commitment to quality, backed by ISO9001 certification, ensures that each valve from our factory meets stringent requirements for safety and durability, providing a dependable solution for your critical fluid control needs.
This valve is designed to offer superior sealing performance and operational reliability. Key features and benefits include:
- Robust Construction: The cast steel body provides excellent strength and corrosion resistance, suitable for harsh marine atmospheres and oil-based media.
- Effective Sealing: The Nitrile Rubber (NBR) seal offers excellent resistance to oils, fuels, and hydrocarbons, ensuring a tight seal and preventing backflow effectively.
- Wide Size Range: Available in sizes from DN50 to DN300, offering flexibility for various pipeline configurations in marine systems.
- Low Pressure Drop: The swing disc design allows for full, unobstructed flow when open, minimizing pressure loss across the valve.
- Automatic Operation: Functions automatically based on flow direction, requiring no external power or manual intervention for normal operation.
- Easy Maintenance: Many models feature a bolted cover design, allowing for relatively straightforward inspection and seal replacement if necessary.
The valve's design is tailored for the specific challenges of marine oil service. The swing check mechanism ensures quick closure upon flow reversal, preventing water hammer and protecting upstream equipment. The materials selected prioritize compatibility with marine fuels, lubricating oils, and other hydrocarbon-based fluids commonly found on vessels and offshore platforms.
Below is a summary of typical technical specifications for this valve series. Please note that specific parameters may vary slightly based on size and pressure rating. Detailed dimensional drawings and pressure-temperature ratings are available upon request.
| Parameter | Specification / Description |
| Product Standard | CB/T4303 (Chinese Ship Standard) |
| Body Material | Cast Steel (e.g., WCB, LCB, etc., customizable) |
| Seal / Disc Seal Material | Nitrile Rubber (NBR) - Standard for Oil Service |
| Nominal Diameter (DN) | 50, 65, 80, 100, 125, 150, 200, 250, 300 mm |
| Pressure Rating (Nominal Pressure, PN) | Commonly PN16, PN25. Other ratings available. |
| Connection Type | Flanged (RF, FF). Flange standards can be specified. |
| Suitable Medium | Marine Diesel Oil (MDO), Fuel Oil, Lubricating Oil, Seawater (with compatible trim) |
| Operating Temperature | -20°C to +80°C (with standard NBR seal) |
For clients, the primary advantages translate into tangible operational benefits. The valve's reliability reduces the risk of system failure and costly downtime. Its compliance with the marine-specific CB/T4303 standard provides assurance of its suitability for shipboard use. The durability of cast steel and NBR extends service intervals, lowering the total cost of ownership. Furthermore, the availability across a common size range simplifies procurement and inventory management for shipyards and fleet operators.
Established in 2016 and with an annual export value ranging between US$1 Million and US$1.5 Million, Shanghai Zhibang Valve has built a solid reputation for supplying quality industrial valves to a global clientele across North America, South America, Europe, Asia, Africa, and Oceania. Our products are shipped from major ports including Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring efficient logistics. Our ISO9001 certified manufacturing process is your guarantee of consistent quality and performance. We understand the critical nature of marine components and stand behind our Marine Check Valves as a reliable, cost-effective solution for backflow prevention in oil systems. Contact us today to discuss your project requirements, request detailed specifications, or to place an order. Our team is ready to provide technical support and competitive quotations.
Frequently Asked Questions (FAQ)
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Q: What is the main advantage of using a check valve according to CB/T4303 for marine applications?
A: The CB/T4303 standard is specifically developed for shipbuilding and marine equipment in China. Valves manufactured to this standard are designed and tested to meet the unique environmental and operational demands of marine service, including vibration, corrosion, and specific safety requirements, ensuring higher suitability and reliability compared to general industrial valves. -
Q: Is the NBR seal suitable for all types of oil on a ship?
A: Nitrile Rubber (NBR) offers very good resistance to a wide range of oils, including marine diesel oil (MDO), lubricating oils, and hydraulic oils. It is a standard and reliable choice for general oil service. For specific, aggressive chemicals or high-temperature oils, alternative seal materials like Fluorocarbon (FKM/Viton) may be recommended. -
Q: Can this valve be used for seawater service?
A: While the standard configuration with a cast steel body and NBR seal is optimized for oil service, it can be used for seawater if the material specifications are adjusted. This typically involves upgrading the body material to a corrosion-resistant alloy like bronze or stainless steel (e.g., CF8M) and potentially changing the seal material. Please inquire for seawater-specific configurations. -
Q: What flange standards are available for these valves?
A: We can supply valves with flanges machined to common international standards such as ISO, DIN, ANSI/ASME, JIS, or GB (Chinese national standard). The specific standard, face type (RF, FF), and pressure class (e.g., PN16, Class 150) should be specified at the time of inquiry to ensure compatibility with your existing piping. -
Q: What is the typical delivery lead time for an order of DN100 valves?
A: Lead times vary based on order quantity, specific configuration, and current production schedule. For standard configurations in common sizes, we often maintain some inventory or can produce within a few weeks. We provide estimated lead times with every quotation to help you plan your project. -
Q: Do you offer any testing or certification with the valves?
A> Yes. As an ISO9001 certified manufacturer, we perform routine factory tests which may include shell strength tests and seat leakage tests according to relevant standards. Standard material certificates (MTC) are provided. Specific third-party inspections or certifications can be arranged upon request and may incur additional charges and time. -
Q: Are spare parts like the seal or disc available for purchase separately?
A: Absolutely. We supply genuine spare parts for all our valves, including seal kits, discs, hinges, and springs. Using original spare parts ensures optimal fit and performance, maintaining the valve's designed reliability and service life. -
Q: Can you customize the valve for a non-standard pressure rating or connection?
A: We have engineering and manufacturing capabilities to handle custom requirements. This includes special pressure ratings, exotic materials, unique connection types, or modifications to meet specific project specifications. Please provide detailed requirements for a feasibility study and quotation.
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