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Help CenterCB/T3191 Manual Gear Marine Ball Valve With 2-Year Warranty and Mill Test Report
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As a professional manufacturer of industrial valves with ISO9001 certification and a strong presence in global maritime markets, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our CB/T3191 Manual Gear Marine Ball Valve. Engineered for reliability in demanding marine environments, this valve is a cornerstone for shipbuilding, offshore platform construction, and port facility maintenance. Our commitment to quality, backed by an annual export value exceeding US$1 million, ensures that every valve delivers exceptional performance, durability, and safety for critical fluid control applications on board.
This manual gear-operated ball valve is specifically designed to meet the rigorous standards of marine engineering. The gearbox mechanism provides significant mechanical advantage, allowing for smooth and effortless operation even under high differential pressures or with larger valve sizes. This feature is crucial for onboard systems where manual operation is preferred for reliability or required by safety protocols. The robust construction ensures long-term, maintenance-free service in saltwater atmospheres and with various media, including seawater, fuel oil, lubricating oil, and compressed air.
Key Features and Technical Advantages:
Gear Operation for High Torque Applications: The integrated manual gear operator reduces the required handwheel force by up to 90%, making it possible to open and close large-diameter valves (up to DN300/12") manually. This is essential for systems without pneumatic or hydraulic power sources.
Superior Corrosion Resistance: Available in a range of marine-grade materials. Bronze valves offer excellent resistance to seawater corrosion, while stainless steel (CF8/CF8M) and coated cast steel versions provide solutions for more aggressive chemical services or higher pressure ratings.
Bubble-Tight Shut-off: Features precision-machined ball and seat assemblies. Standard PTFE seats ensure a reliable seal with low operating torque, while reinforced PTFE or metal seats are available for elevated temperature services.
Robust Stem Design: The stem incorporates an anti-blowout design, preventing it from being ejected under pressure if the packing gland is removed, enhancing operator safety. A high-quality stem seal packing system minimizes fugitive emissions.
Fire-Safe Design Option: Optional fire-safe design per API 607/API 6FA standards is available, where secondary metal seats maintain sealing integrity in the event of a fire, protecting critical systems.
Full Port or Standard Port: Choose between full port (full bore) design for minimal pressure drop and pigging capability, or standard port for general applications where space and cost are considerations.
Technical Specifications Table:
| Parameter | Specification |
|---|---|
| Design & Manufacturing Standard | CB/T3191, with options for GB, JIS, DIN, ANSI/ASME |
| Pressure-Temperature Rating | PN10/16/25, 150LB, 300LB (as per selected standard) |
| Size Range | DN15 to DN300 (1/2" to 12") |
| Body Material | Bronze (C95800), Cast Steel (WCB), Stainless Steel (CF8/CF8M), Ductile Iron |
| Ball & Stem Material | Stainless Steel (304/316), Chrome Plated/Bronze, Material matched to body |
| Seat & Seal Material | Standard: PTFE. Optional: Reinforced PTFE, PEEK, Metal (Stainless Steel) |
| Operation Temperature | Standard: -20°C to 180°C. Extended range available upon request. |
| Connection Ends | Flanged (RF, FF), Threaded (NPT, BSPT, BSPP), Butt Weld (BW) |
| Gearbox Ratio | Typically 5:1 to 20:1, depending on valve size and required output torque |
Benefits for Our Clients:
Enhanced Operational Safety & Ease: The gear operator eliminates the need for excessive physical force, reducing the risk of operator injury and ensuring valves can be operated quickly during emergencies.
Reduced Lifecycle Cost: Durable materials and precision engineering minimize wear, leading to fewer replacements and lower maintenance costs over the vessel's lifetime. The 2-year warranty provides added financial security.
System Reliability: Consistent, bubble-tight sealing prevents leaks that could lead to system contamination, environmental hazards, or operational downtime, which is critical for uninterrupted maritime operations.
Flexibility in Procurement: With major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, and extensive experience exporting to markets from North America and Europe to Southeast Asia and Africa, we offer reliable logistics and supply chain support.
Quality Assurance: Each valve is supplied with a comprehensive Mill Test Report (MTR) detailing material chemical composition and mechanical properties, providing full traceability and compliance verification for shipyard inspectors and classification societies.
Trust in a manufacturer with a proven track record since 2016, serving a diverse global clientele across six continents. Our ISO9001-certified quality management system governs every step of production, from raw material inspection to final testing. The included 2-Year Warranty and detailed Mill Test Report are not just promises but tangible proof of our confidence in the durability and performance of the CB/T3191 Manual Gear Marine Ball Valve. For shipbuilders, repair yards, and marine equipment suppliers seeking a reliable, manually operated valve solution that combines robust engineering with certified quality, contact Shanghai Zhibang Valve today to discuss your project requirements and request a quotation.
Frequently Asked Questions (FAQ):
Q1: What is the main advantage of a gear-operated ball valve over a standard handwheel-operated one?
A1: The primary advantage is the significant reduction in operating torque. The gear mechanism provides a mechanical advantage, allowing a single operator to easily open or close large-diameter valves (e.g., 10" or 12") that would otherwise require a large wrench or multiple people with a standard handwheel, enhancing safety and operational efficiency in manual systems.
Q2: Can this valve be used for seawater service?
A2: Yes, absolutely. For seawater applications, we highly recommend selecting the bronze (C95800) or super duplex stainless steel body material options, as they offer superior corrosion resistance in chloride-rich marine environments. The seat and seal materials can also be specified to be compatible.
Q3: What is included in the Mill Test Report (MTR)?
A3: The MTR is a material certificate that provides traceability. It typically includes the heat number/heat code, chemical composition analysis, mechanical property test results (yield strength, tensile strength, elongation), and the results of any supplementary tests like hardness or impact tests, as per the ordered material specification.
Q4: Is the gearbox sealed and protected from the marine environment?
A4: Yes. The gear operator housing is designed to be weatherproof and offers a degree of protection against water splash and salt spray. For particularly harsh environments, additional protective coatings or enclosures can be discussed as a customization option.
Q5: Do you offer different gear ratios?
A5: Yes. The standard gearbox is selected to provide optimal torque output for the valve's size and pressure class. However, specific gear ratios can be customized upon request to meet unique system pressure conditions or specific operational torque requirements outlined by the client.
Q6: What classification society approvals do you hold for marine valves?
A6: While our production is under an ISO9001 quality system, specific approvals from classification societies like ABS, DNV, BV, LR, etc., are typically project-specific. We can manufacture valves to meet the relevant rules and can arrange for third-party inspection and certification as required by the client's project, which should be specified during the inquiry stage.
Q7: How does the 2-year warranty work?
A7: Our warranty covers defects in materials and workmanship under normal use and service conditions as specified for a period of 24 months from the date of shipment. It includes repair or replacement of the defective valve. The warranty terms and claim procedure are detailed in our commercial documents.
Q8: Can you provide valves with different end connections, like NPT threads for the American market?
A8: Certainly. We are experienced in global standards. The valve can be supplied with flanged ends per ANSI/ASME B16.5, threaded ends per NPT or BSP standards, or butt-weld ends. Please specify your required connection standard and pressure class when inquiring.
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