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Help CenterCB/T3191 Standard Ball Valve for Marine Fuel Oil Systems, Low Temperature Carbon Steel, Extended Bonnet
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As a specialized manufacturer with a strong focus on marine and industrial fluid control, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our CB/T3191 Standard Ball Valve, engineered specifically for demanding marine fuel oil systems. Built from low-temperature carbon steel and featuring an extended bonnet design, this valve is a reliable solution for shipbuilders, shipyards, and marine equipment suppliers worldwide. Our commitment to quality, backed by ISO9001 certification, ensures that every valve meets the rigorous standards required for safe and efficient maritime operations. With extensive export experience across global markets, we understand the critical need for durable, high-performance valves that can withstand the harsh marine environment.
This marine-grade ball valve is designed to offer superior control and safety in fuel oil transfer and service lines. The extended bonnet is a key feature, providing essential insulation that protects the valve stem packing from the extreme temperature fluctuations common in fuel oil systems. This design significantly extends the service life of the valve and reduces maintenance requirements. The low-temperature carbon steel construction ensures excellent toughness and impact resistance even in cold operating conditions, preventing brittle fracture and ensuring operational integrity.
- Robust Construction & Material Integrity: The valve body, ball, and stem are manufactured from specially selected low-temperature carbon steel. This material undergoes stringent quality checks to guarantee its chemical composition and mechanical properties, such as yield strength and Charpy impact value, are optimal for sub-zero service conditions often encountered at sea.
- Extended Bonnet Advantage: The extended bonnet moves the stem packing away from the valve body cavity. This critical design isolates the sealing components from the direct flow of hot or cold fuel oil, maintaining a more stable temperature around the stem seals. This results in reduced thermal stress on the packing, minimizing the risk of leaks and the need for frequent tightening or replacement.
- Precision Machining & Sealing: The ball is precision-ground and polished to a mirror finish, ensuring a perfect spherical shape for reliable shut-off. The seats, typically made from reinforced PTFE for standard service or metal for fire-safe applications, are designed to provide a bubble-tight seal with low operating torque. The stem is designed with an anti-blowout feature for enhanced safety.
- Versatile Operation & Configuration: The valve is designed for manual operation via a lever or, for larger sizes or higher pressure applications, can be fitted with a gearbox operator. Various end connections, including raised face flanges conforming to common standards like ANSI or JIS, are available to suit different piping specifications.
Here is a summary of typical specifications and configurations:
| Parameter | Specification / Option |
|---|---|
| Design Standard | CB/T3191 (China Ship Standard) |
| Pressure Rating | PN16, PN25, PN40 (or Class 150, 300) |
| Temperature Range | Suitable for Low-Temperature Service (exact range depends on material grade) |
| Port Type | Full Port (Standard), Reduced Port (Optional) |
| Fire Safe Design | Optional, compliant with API 607/API 6FA standards |
| Anti-Static Device | Standard |
| Blow-Proof Stem | Standard |
The primary benefits for your business are clear. You gain access to a valve that enhances system safety by reducing leak paths, lowers total cost of ownership through extended maintenance intervals, and ensures compliance with marine-specific standards. Its reliable performance contributes to uninterrupted vessel operation, which is paramount in the shipping industry. Furthermore, the valve's adaptability allows for integration into both newbuild projects and retrofit applications on existing vessels.
With an annual export value ranging between US$1 Million and US$1.5 Million and a presence in key maritime markets from North America and Europe to Southeast Asia and Africa, Shanghai Zhibang has proven its capability to deliver quality products on a global scale. Our valves are shipped from major ports like Shanghai, Guangzhou, and Hong Kong, ensuring efficient logistics. Choosing our CB/T3191 ball valve means partnering with an established manufacturer that combines technical expertise with practical maritime application knowledge. We invite you to contact us for detailed quotations, technical drawings, or to discuss custom requirements for your specific marine fuel oil system project.
Frequently Asked Questions (FAQ)
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Q: What is the main purpose of the extended bonnet on this ball valve?
A: The extended bonnet serves to distance the stem sealing components (packing) from the valve body. In fuel oil systems, temperatures can vary significantly. This design stabilizes the temperature around the stem, protecting the packing from thermal cycling, which helps prevent leaks and extends the service life of the seal. -
Q: Can this valve be used for other fluids besides marine fuel oil?
A: While specifically designed and tested for marine fuel oil (like MDO, HFO), its low-temperature carbon steel construction and robust design make it suitable for other similar services in marine and industrial applications, such as lubricating oil, thermal oil, or other hydrocarbons. Please consult with our engineers for specific fluid compatibility. -
Q: Are fire-safe versions of this valve available?
A: Yes, we offer a fire-safe design as an optional feature. These valves incorporate metal secondary seals that maintain sealing integrity in the event of a fire, typically complying with recognized standards like API 607 or API 6FA. This is a critical requirement for many fuel system specifications. -
Q: What end connection standards do you support?
A> We commonly manufacture valves with flanged ends conforming to standards like ANSI B16.5, JIS B2220, or DIN. The specific flange standard, face type (RF, FF), and drilling can be customized according to your piping specifications and project requirements. -
Q: What is the lead time for an order of these valves?
A> Lead time depends on the order quantity, size, and specific configuration (e.g., fire-safe option, operator type). For standard specifications and moderate quantities, typical production lead times range from 4 to 8 weeks. We provide accurate timelines upon receipt of your detailed inquiry. -
Q: Do you provide documentation and certification with the valves?
A> Yes, we provide essential documentation, which typically includes a material test certificate (MTC), hydrostatic test report, and a certificate of conformity. For specific projects, other documentation like NDT reports can be arranged. -
Q: How does the CB/T3191 standard relate to other international standards?
A> CB/T is a Chinese national standard specifically for shipbuilding. The CB/T3191 standard for ball valves outlines requirements for design, materials, testing, and marking suitable for marine use. It is recognized and accepted in many international shipbuilding projects, often considered alongside or equivalent to other marine-oriented specifications. -
Q: What after-sales support do you offer?
A> We provide technical support for installation and operation. While we recommend sourcing spare parts like seals and gaskets from us for optimal compatibility, we can provide guidance on maintenance procedures. Our support aims to ensure the long-term, reliable performance of our products in your systems.
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