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Home > Industrial Equipment & Components > Valve > Butterfly Valve > CB/T3191 Reduced Bore Marine Ball Valve With Warranty and Spare Parts Kit

CB/T3191 Reduced Bore Marine Ball Valve With Warranty and Spare Parts Kit

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Product Spotlights

CB/T3191 standard marine ball valve featuring a space and weight-saving reduced bore design. Built with corrosion-resistant materials for harsh marine environments, it ensures reliable, bubble-tight shut-off. Each valve is backed by a manufacturer's warranty and includes a practical spare parts kit for reduced maintenance downtime. Ideal for seawater, fuel, air, and other shipboard piping systems.

Negotiable MOQ: 1 Unit (Price negotiable depending on order volume and customization)

Key Specifications

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Application:

Other, Marine & Offshore Piping Systems

Product Standard:

CB/T3191

Port Type:

Reduced Bore (Reduced Port)

Contact Supplier Request Quote Chat Now

Shanghai Zhibang Valve Manufacture Co.,ltd

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
Company Profile
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Application Other, Marine & Offshore Piping Systems

Product Standard CB/T3191

Port Type Reduced Bore (Reduced Port)

Body Material Carbon Steel, Stainless Steel, Duplex Steel

Seat Material PTFE, RPTFE, Metal Seated

End Connection Flanged (RF, RTJ), Threaded, Welded

Pressure Rating PN10, PN16, PN25, PN40, Class150, Class300

Operation Type Lever, Gear Operator, Pneumatic, Electric

Temperature Range -20°C to 200°C (Standard)

Valve Size Range DN15 to DN600 (1/2“ to 24“)

Welcome to Shanghai Zhibang Valve Manufacture Co., Ltd. As a professional valve manufacturer established in 2016, we specialize in providing high-performance and reliable fluid control solutions for the demanding marine industry. Our CB/T3191 Reduced Bore Marine Ball Valve is engineered to meet the rigorous standards of shipbuilding and offshore applications, offering exceptional durability and precise flow control in a compact, space-saving design. This valve is supplied with a comprehensive warranty and a dedicated spare parts kit, ensuring long-term operational security and minimizing vessel downtime for our clients worldwide, from North America to Southeast Asia.

This valve is not just a component; it's a commitment to the safety and efficiency of your marine operations. The reduced bore design is a key feature, providing a smaller flow passage than the connecting pipeline. This offers significant advantages in marine systems where space and weight are critical factors, and where pressure drop can be managed or is even desirable for certain control functions. The robust construction and adherence to the CB/T3191 Chinese ship standard ensure compatibility and reliability in seawater, fuel oil, lubricating oil, compressed air, and other shipboard service lines.

Core Product Features & Technical Advantages:

Standard-Compliant Design: Manufactured in strict accordance with the CB/T3191 standard for marine valves, guaranteeing dimensional interchangeability, material suitability, and performance metrics required for marine classification society approvals.
Optimized Reduced Bore Construction: The bore is typically reduced to approximately one pipe size smaller than the valve's nominal size. This design reduces the overall valve weight, requires less actuator torque, and can lower initial cost, making it ideal for large-diameter lines where full flow is not essential.
Superior Sealing & Long Service Life: Features advanced seat materials like reinforced PTFE (RPTFE) or metal seats for fire-safe applications. The precision-machined ball and seats ensure bubble-tight shut-off, even after prolonged cycles, critical for preventing leaks in sensitive marine environments.
Robust & Corrosion-Resistant Materials: Available in a range of materials to combat harsh marine conditions:
- Body/Ball/Stem: Carbon Steel (WCB), Stainless Steel (CF8/CF8M/CF3/CF3M), Duplex Steel (F51/F53).
- Surfaces are often treated with epoxy coatings or electroless nickel plating for enhanced corrosion resistance against saltwater spray and atmospheric conditions.
Versatile Operation & Actuation: Can be fitted with a standard lever, a gearbox for larger sizes, or automated with pneumatic or electric actuators. The stem is designed with an anti-blowout feature for safety.
Comprehensive Warranty & Spare Parts Kit: Each valve is backed by a clear warranty against manufacturing defects. The included spare parts kit typically contains critical wear items like seat seals, stem packing, and gaskets, enabling quick onboard maintenance and repair.

Key Technical Specifications:

Parameter	Specification / Option
Design & Manufacturing Standard	CB/T3191
Pressure-Temperature Rating	PN16, PN25, PN40; Class150, Class300 (ASME)
Size Range (Nominal Diameter)	DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300, and larger upon request.
End Connection Standards	Flanged: GB/T 9113, JB/T 79, ANSI B16.5, DIN, JIS. Threaded: NPT, BSPT, BSPP.
Fire Safe Design	Optional, compliant with API 607/API 6FA standards.
Test & Inspection	Shell Test, Seat Leakage Test (Air or Water), according to GB/T 13927 or API 598.

Benefits for Your Marine Projects:

Enhanced System Reliability: Reduces the risk of in-service failure, contributing to vessel safety and uninterrupted operations.
Reduced Lifecycle Cost: The combination of durable construction, included spare parts, and a solid warranty lowers total cost of ownership by extending service intervals and simplifying maintenance.
Simplified Procurement & Inventory: Compliance with the widely recognized CB/T3191 standard simplifies specification and ensures parts compatibility across your fleet.
Flexibility in Design: The reduced bore option allows system designers to optimize pipe and valve sizing for cost and space efficiency without compromising on valve functionality.

Choosing Shanghai Zhibang means partnering with an experienced manufacturer whose products are trusted in over a dozen global markets, from Eastern Europe to Oceania. Our annual export volume reflects the consistent quality and reliability we deliver. Operating under an ISO9001 certified quality management system, every CB/T3191 valve undergoes rigorous testing before shipment from major ports like Shanghai and Guangzhou. We understand the critical nature of marine components and stand behind our products. For a valve solution that balances performance, economy, and long-term support for your marine or offshore application, contact us today for a detailed quotation or technical consultation.

Frequently Asked Questions (FAQ):

Q: What is the main difference between a reduced bore and a full bore ball valve in marine use?
A: A full bore valve has an internal diameter matching the pipe, minimizing pressure drop. A reduced bore valve has a smaller flow passage, which reduces weight, size, and cost. It's suitable for applications where a slight pressure increase is acceptable, such as in many shipboard utility lines.
Q: Is the CB/T3191 standard accepted by international marine classification societies?
A: Yes, the CB/T3191 is a Chinese national standard specifically for ship valves. It is widely recognized and can be used as a basis for approval by major classification societies (like ABS, DNV, LR, BV) when supported by the necessary material certificates and test reports. We can provide documentation to facilitate this process.
Q: What is typically included in the spare parts kit?
A: The kit is designed for common maintenance needs and usually includes items like a set of seat seals (PTFE/RPTFE rings), stem packing set (graphite or PTFE), body gaskets, and sometimes a set of bolts/nuts. The exact contents can be customized based on valve size and service.
Q: Can this valve be used for cryogenic services or high-temperature applications beyond the standard range?
A: The standard valve is rated for -20°C to 200°C. For cryogenic (e.g., LNG) or higher temperature services, special design considerations for materials (e.g., extended stem, low-temperature seat materials) and manufacturing are required. We offer customized solutions for such demanding conditions.
Q: What is the lead time for an order of these valves?
A: Lead time depends on the order quantity, size, material, and any special requirements. For standard configurations in common sizes and materials, we typically maintain stock or can produce within 4-6 weeks. We provide a confirmed timeline with every quotation.
Q: Do you offer actuated versions of this valve?
A: Absolutely. We can supply the valve pre-fitted with pneumatic (double-acting or spring-return) or electric actuators. We will select an appropriately sized actuator based on your valve size, pressure differential, and required operating speed/torque.
Q: How does the warranty work, and what does it cover?
A: Our warranty covers defects in materials and workmanship under normal use and service for a specified period (e.g., 12-24 months from shipment). It includes repair or replacement of the defective valve. The warranty terms are clearly stated in our commercial contract. Proper installation and use per our instructions are required for warranty validity.
Q: Can you provide valves with different face-to-face dimensions than CB/T3191?
A: While we primarily manufacture to the CB/T3191 standard dimensions, we have the capability to produce valves to other international standards like ISO 17292, API 6D, or to specific customer drawings, subject to engineering review and quotation.