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Help CenterCB/T3191 Standard Marine Ball Valve, Carbon Steel Body With Metal Hard Seal, DN100 Max Size
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As a professional manufacturer specializing in industrial valves since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our CB/T3191 Standard Marine Ball Valve. Engineered for demanding marine applications, this valve combines robust carbon steel construction with a durable metal hard seal to deliver reliable shut-off performance in corrosive and high-pressure shipboard environments. With an annual export value demonstrating our global reach across markets from North America to Southeast Asia, we understand the critical need for components that meet stringent maritime standards. This valve is designed to provide shipbuilders, shipyards, and marine system integrators with a dependable solution for fluid control, ensuring operational safety and longevity in harsh sea conditions.
Our CB/T3191 Marine Ball Valve is built to excel where ordinary valves fail. The core of its reliability lies in the precision-engineered metal hard seal, which offers superior resistance to wear, erosion, and chemical attack compared to soft-sealed alternatives. This feature is particularly crucial for handling seawater, fuels, lubricants, and other aggressive media common in marine systems. The carbon steel body provides exceptional structural strength and impact resistance, essential for withstanding the vibrations and mechanical stresses encountered onboard vessels. The valve's design adheres strictly to the CB/T3191 Chinese national standard for shipbuilding, ensuring compatibility and compliance with many international marine projects.
Key Technical Features and Advantages:
- Enhanced Durability: The metal-to-metal sealing surface is hardened through specialized processes, significantly extending service life and reducing maintenance cycles even with abrasive fluids.
- Fire-Safe Design: In the event of high temperatures, the metal seal maintains its integrity longer than polymeric seals, contributing to overall system fire safety—a critical consideration for marine classification societies.
- Bidirectional Sealing: Provides effective shut-off from both flow directions, offering installation flexibility and reliable performance in complex piping layouts.
- Low Torque Operation: Despite its robust seal, the floating ball design and precision machining ensure smooth operation with manageable actuation torque, allowing for efficient manual control.
- Wide Temperature Compatibility: Capable of functioning across a broad temperature range, making it suitable for various shipboard systems from bilge lines to engine cooling circuits.
- Minimal Leakage Path: The design minimizes potential leakage points, enhancing system integrity and environmental protection—a paramount concern in maritime operations.
The valve is available in a range of sizes up to DN100, catering to most standard marine piping requirements. Standard connection is flanged, with specific pressure class and flange standard (e.g., JIS, ANSI, DIN) customizable based on project specifications. The table below outlines typical specifications:
| Parameter | Specification / Description |
| Product Standard | CB/T3191 (Chinese Ship Standard) |
| Valve Type | Floating Ball, Full Port |
| Body Material | Carbon Steel (WCB, A216 WCB, or equivalent) |
| Ball & Stem Material | Stainless Steel (common) or other alloys upon request |
| Seat Material | Metal Hard Seal (e.g., Stellite, hardened stainless steel) |
| Size Range | DN15 to DN100 (1/2" to 4" NPS range) |
| Pressure Rating | PN16, PN25, PN40, Class 150, Class 300 (customizable) |
| Operation | Manual Lever/Handle (standard). Gearbox, pneumatic, or electric actuation optional. |
Benefits for Your Marine Projects: Choosing this valve translates into tangible operational and economic advantages. Its extended service life reduces total cost of ownership by lowering replacement frequency and downtime. Compliance with the CB/T3191 standard simplifies approval processes with ship classification societies for many Asian and international shipyards. The robust construction minimizes the risk of in-service failure, which is critical for safety and avoiding costly maritime incidents. Furthermore, our manufacturing process under an ISO9001 certified quality management system ensures consistent product quality and traceability, giving you confidence in every valve supplied.
Backed by Shanghai Zhibang Valve's experience as an established manufacturer since 2016 and our proven track record of exporting to diverse and demanding markets across five continents—from the shipbuilding hubs of Eastern Asia and Northern Europe to the growing maritime sectors in Africa and Oceania—you can trust in our capability to deliver. Our products ship from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring flexible and efficient logistics. The combination of adherence to the recognized CB/T3191 standard, durable metal hard seal technology, and carbon steel robustness makes this valve a reliable choice for your marine fluid control systems. Contact us today to discuss your specific DN size, pressure rating, and material requirements, and experience the difference that a professionally manufactured, application-engineered marine valve can make.
Frequently Asked Questions (FAQ)
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Q: What is the main advantage of a metal hard seal compared to a soft (PTFE/polymer) seal for marine use?
A: Metal hard seals offer far greater resistance to wear, erosion, and high temperatures. They are not susceptible to degradation from sunlight (UV), many chemicals, or cold flow, making them significantly more durable in the harsh, long-term environment of a ship. This translates to longer maintenance intervals and higher reliability. -
Q: Is the CB/T3191 standard recognized internationally, or only in China?
A: CB/T standards are Chinese national standards for shipbuilding. They are widely recognized and accepted by many international shipyards and classification societies, especially for projects involving Chinese-built vessels or components. They are often considered alongside other standards like ISO, ANSI, or JIS depending on the project specifications. -
Q: Can this valve be used for media other than water, such as fuel oil or compressed air?
A: Yes. The carbon steel body and metal hard seal construction make it suitable for a variety of media including seawater, fresh water, fuel oils, lubricating oils, and compressed air. The specific material grade for the ball and stem can be selected to enhance compatibility with aggressive or specific media upon request. -
Q: What are the available pressure classes for the DN100 size?
A> Standard offerings typically include PN16 and PN25 (metric) or Class 150 and Class 300 (imperial). Higher pressure ratings like PN40 or Class 600 are available as a customization, depending on the specific body and seal material configuration. -
Q: Is the valve suitable for both above-deck and below-deck installations?
A: Absolutely. Its robust carbon steel construction provides good general corrosion resistance. For highly corrosive splash zones or specific environmental conditions, additional surface treatments (e.g., coatings) or alternative material options like stainless steel can be explored to meet the application's needs. -
Q: Do you offer actuated versions (pneumatic/electric) of this valve?
A: Yes. While the standard configuration is a manual lever handle, we can supply the valve prepared for the installation of pneumatic (cylinder) or electric (motorized) actuators. We can also provide complete actuated packages tailored to your control system requirements. -
Q: What is the typical lead time for an order of DN80 and DN100 valves?
A: Lead times vary based on order quantity and specific customization. For standard configurations, we generally maintain efficient production schedules. Accurate lead times are provided with every formal quotation based on current production planning. -
Q: Does the valve come with any documentation or certification?
A> Each valve is supplied with essential documentation. As a manufacturer operating under an ISO9001 quality management system, we can provide material certificates, inspection reports, and a manual. Specific classification society certifications (if required) can be arranged as a separate service.
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