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Home > Industrial Equipment & Components > Valve > Ball Valve > 3-Piece Marine Duplex Stainless Steel Ball Valve, Flanged End, Fire Safe Design

3-Piece Marine Duplex Stainless Steel Ball Valve, Flanged End, Fire Safe Design

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3-Piece Marine Duplex Stainless Steel Ball Valve, Flanged End, Fire Safe Design photo-4

3-Piece Marine Duplex Stainless Steel Ball Valve, Flanged End, Fire Safe Design photo-5

Product Spotlights

Engineered for critical marine and industrial service, this 3-piece ball valve combines Duplex Stainless Steel for superior corrosion resistance with a certified fire-safe design for ultimate safety. Its flanged ends ensure secure connections, while the 3-piece construction allows for easy inline maintenance, reducing downtime and lifecycle costs. Ideal for offshore, oil & gas, and chemical applications demanding reliability and compliance.

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

Key Specifications

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Material:

Other, Duplex Stainless Steel (e.g., UNS S31803/S32205)

Application:

Other, Marine

Standard:

ISO9001 Certified Manufacturing

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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
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Material Other, Duplex Stainless Steel (e.g., UNS S31803/S32205)

Application Other, Marine

Standard ISO9001 Certified Manufacturing

End Connection Flanged (RF/RTJ, ASME B16.5)

Design 3-Piece, Fire Safe Design per API 607/API 6FA/ISO 10497

Operation Lever Handle, Gearbox, Pneumatic/Hydraulic Actuator (Optional)

Size Range DN15 (1/2“) to DN300 (12“)

Pressure Rating PN16/PN25/PN40, Class 150/Class 300

Seat Material PTFE, Reinforced PTFE, Metal Seated (Fire Safe)

Brand Zhibang Valve

As a leading manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in delivering high-performance industrial valves for demanding global markets. Our 3-Piece Marine Duplex Stainless Steel Ball Valve with Flanged End and Fire Safe Design represents our commitment to safety, durability, and reliability in critical applications. Engineered for the harsh conditions of marine and offshore environments, this valve combines superior corrosion resistance with certified fire safety, offering a robust solution for fluid control systems where failure is not an option. With an annual export value of US$1-1.5 million and a strong presence across North America, Europe, Asia, and beyond, we have built our reputation on quality and customer trust.

This valve is meticulously crafted to meet the highest industry standards, providing exceptional performance in corrosive and high-pressure services. Its design addresses the common pain points of valve maintenance, seat integrity under fire conditions, and long-term lifecycle costs. Below are the key features and technical specifications that set our valve apart:

Superior Material Construction: Manufactured from Duplex Stainless Steel (UNS S31803/S32205), this valve offers excellent resistance to stress corrosion cracking, pitting, and crevice corrosion, especially in chloride-rich environments like seawater. Its high strength allows for a more compact and lighter design compared to standard stainless steels.
Certified Fire Safe Design: The valve is designed and tested to comply with recognized fire safety standards such as API 607, API 6FA, or ISO 10497. In the event of a fire, the primary soft seats (like PTFE) may degrade, but a secondary metal-to-metal seal engages to prevent catastrophic leakage, maintaining a critical level of isolation.
3-Piece Bolted Body Construction: This design offers significant advantages for installation and maintenance. The center section containing the ball and seats can be easily removed without disturbing the pipeline flanges, drastically reducing downtime and maintenance costs. It also allows for easy inline maintenance and seat replacement.
Versatile Flanged End Connections: Equipped with standard ASME B16.5 flanges (Raised Face or Ring Type Joint), the valve ensures a secure, leak-proof connection to the piping system, facilitating easy installation and removal. Flanges are precision machined to ensure proper gasket seating and bolt alignment.
Robust Sealing Options: Standard seats are made from advanced polymers like PTFE or reinforced PTFE for tight shut-off and low torque operation. For fire-safe applications, the design incorporates secondary metal seats (often Stellite-hardened) that provide the essential seal after a fire event.
Multiple Actuation Options: Available with a standard lever handle for manual operation. For automated process control, it can be fitted with pneumatic (double-acting or spring-return) or hydraulic actuators, as well as gear operators for larger sizes requiring higher torque.

Here is a summary of typical technical specifications:

Parameter	Specification
Body Material	Duplex Stainless Steel (UNS S31803/S32205)
Ball & Stem Material	Duplex Stainless Steel
Seat Material (Primary)	PTFE, Reinforced PTFE, PEEK
Seat Material (Secondary/Fire Safe)	Metal (e.g., 316SS with Stellite facing)
Size Range	DN15 (1/2") to DN300 (12")
Pressure Rating	PN16, PN25, PN40 / Class 150, Class 300
End Connection	Flanged, ASME B16.5 RF or RTJ
Fire Safe Standard	API 607, API 6FA, ISO 10497 (as specified)
Temperature Range	-29°C to +200°C (with standard seats)
Operation	Lever Handle, Gear Operator, Pneumatic/Hydraulic Actuator (Optional)

Benefits for Our Clients:

Enhanced Safety & Compliance: The certified fire-safe design provides peace of mind and helps meet stringent safety regulations in oil & gas, marine, and chemical industries.
Reduced Lifecycle Cost: The duplex stainless steel construction offers exceptional corrosion resistance, minimizing replacement frequency. The 3-piece design slashes maintenance time and costs.
High Reliability in Harsh Conditions: Ideal for seawater cooling, offshore platforms, chemical tankers, and FPSO applications where reliability is paramount.
Operational Flexibility: Easy to install, maintain, and automate, adapting to various system requirements.
Global Supply Chain Support: With major shipment ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure efficient logistics to our main markets worldwide.

Shanghai Zhibang Valve's commitment to quality is backed by our ISO9001 certification, ensuring consistent manufacturing processes and product reliability. Since our establishment in 2016, we have successfully supplied valves to diverse and demanding regions including North America, Eastern Europe, Southeast Asia, and the Middle East. Our experience in these markets has honed our ability to deliver products that meet specific regional and application standards. Choosing our 3-Piece Marine Duplex Stainless Steel Ball Valve means investing in a component engineered for longevity, safety, and performance. We invite you to contact us for a detailed quotation or to discuss how this valve can be tailored to your specific project requirements.

Frequently Asked Questions (FAQ):

Q: What makes Duplex Stainless Steel suitable for marine applications?
A: Duplex stainless steel possesses a mixed austenitic-ferritic microstructure, granting it approximately twice the yield strength of standard 316 stainless steel and superior resistance to chloride-induced stress corrosion cracking, which is a common failure mode in marine environments.
Q: How does the "Fire Safe" feature actually work in this ball valve?
A: In a fire-safe design, the valve incorporates a secondary sealing system, typically a metal seat located behind the primary polymer seat. During a fire, the primary seat may melt or degrade, but the ball is forced against the secondary metal seat by thermal expansion or spring mechanisms, maintaining a seal to prevent major fluid release.
Q: Can this valve be supplied with different flange standards, like DIN or JIS?
A: Yes, while ASME B16.5 flanges are standard, we can provide valves with DIN, EN, JIS, or other flange standards upon request to match your existing piping specifications.
Q: What is the advantage of a 3-piece design over a one-piece or two-piece ball valve?
A: The 3-piece design allows the valve body to be split, enabling easy removal of the internal components (ball, seats, stem) for inspection, cleaning, or seat replacement without needing to remove the entire valve from the pipeline. This drastically simplifies maintenance.
Q: Is the valve suitable for cryogenic services?
A: The standard temperature range is typically from -29°C to +200°C. For cryogenic applications below -29°C, special seat materials and extended bonnet designs may be required; such configurations can be discussed as a custom option.
Q: Do you provide actuation packages, and what information is needed for a quote?
A: Yes, we offer integrated actuation packages (pneumatic, hydraulic, electric). For a quote, we require details such as required operation time (fail-safe or double-acting), available supply pressure, required torque, and any specific control signals or accessories.
Q: What documentation accompanies the valve upon delivery?
A: Standard documentation includes a Material Test Report (MTR/Certificate of Conformity), product manual, and packing list. Fire safe test certificates (if applicable and ordered) are also provided.
Q: What is your typical lead time for an order of these valves?
A: Lead time depends on size, material grade, and quantity. For standard configurations in moderate quantities, lead times generally range from 4 to 8 weeks. We provide precise lead time estimates upon order confirmation.