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Home > Industrial Equipment & Components > Valve > Check Valve > DN50 To DN200 Marine Stop Check Valve Compliant With GB/T1855 Standard For Seawater Systems

DN50 To DN200 Marine Stop Check Valve Compliant With GB/T1855 Standard For Seawater Systems

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Product Spotlights

Dual-function marine valve combining manual shut-off and automatic backflow prevention. GB/T1855 compliant for guaranteed marine suitability. Available in DN50 to DN200 sizes with corrosion-resistant material options (bronze/stainless steel trim). Flanged design for easy installation. Manufactured under ISO9001, exported globally. Protects seawater cooling, ballast, and firefighting systems from reverse flow damage.

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

Key Specifications

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Application:

Other, Marine and Seawater Systems

Product Type:

Stop Check Valve

Standard Compliance:

GB/T1855

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
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Application Other, Marine and Seawater Systems

Product Type Stop Check Valve

Standard Compliance GB/T1855

Nominal Diameter Range DN50 to DN200

Body Material Cast Iron, Ductile Iron, Stainless Steel (optional)

Seat Material Bronze, Stainless Steel (optional)

End Connection Flanged

Pressure Rating PN10, PN16, PN25 (customizable)

Operation Mode Lift-type, Non-return

Certification ISO9001 Quality Management System

As a specialized manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our high-performance Marine Stop Check Valves, engineered for demanding seawater applications. With years of expertise and a global export footprint spanning from North America to Oceania, we understand the critical need for reliable, corrosion-resistant flow control in marine environments. Our DN50 to DN200 valves, rigorously compliant with the GB/T1855 standard, are designed to offer superior sealing, durability, and safety, ensuring uninterrupted operation and protecting your valuable seawater systems from reverse flow damage.

Our Marine Stop Check Valve is a versatile component that combines the functions of a stop valve and a check valve. It allows manual shut-off while automatically preventing backflow, making it indispensable for seawater cooling lines, ballast systems, firefighting systems, and other critical onboard piping. The valve's robust construction is tailored to withstand the harsh, corrosive nature of seawater, featuring material selections and design principles that prioritize longevity and maintenance-free operation.

Key Features & Technical Advantages:

Dual-Function Design: Integrates manual flow shut-off capability with automatic, spring-assisted check valve action, simplifying system layout and enhancing operational control.
Superior Corrosion Resistance: Critical wetted parts, such as the disc and seat, are available in bronze or stainless steel options, providing excellent resistance to seawater pitting and erosion.
Robust Pressure Containment: The valve body, crafted from high-grade cast iron or ductile iron, is designed to handle standard pressure ratings of PN10, PN16, and PN25, ensuring reliable performance under varying system pressures.
Leak-Tight Sealing: Precision-machined seat and disc interface, often enhanced with resilient sealing materials, guarantees a bubble-tight seal in both the closed and check positions, minimizing water loss and maintaining system efficiency.
Easy Operation & Maintenance: Features a standard handwheel for straightforward manual operation. The flanged end connections (ASME/EN/DIN standards available) facilitate easy installation and integration into existing piping networks.
Compliance & Reliability: Manufactured in strict accordance with the GB/T1855 standard for marine valves, ensuring dimensional interchangeability, material suitability, and performance consistency expected in the maritime industry.

Detailed Technical Specifications:

Parameter	Specification
Valve Type	Lift-Type Stop Check Valve
Size Range	DN50, DN65, DN80, DN100, DN125, DN150, DN200
Body Material	Cast Iron (GG25), Ductile Iron (GGG40), Stainless Steel (CF8M/316) optional
Trim Material (Disc/Seat)	Bronze, Stainless Steel (optional for enhanced corrosion resistance)
End Connection	Flanged (RF face), Standards: EN1092-1, ASME B16.5, JIS, etc.
Pressure Rating	PN10 (10 bar), PN16 (16 bar), PN25 (25 bar) - customizable
Temperature Range	-10°C to 120°C (for standard materials, specific ranges available upon request)
Applicable Fluid	Seawater, Fresh Water, Other non-aggressive liquids
Operation	Manual (Handwheel), Gearbox operation available for larger sizes
Design Standard	GB/T1855

Benefits for Your Operations:

System Protection: Prevents damaging reverse flow in seawater systems, safeguarding pumps, heat exchangers, and other downstream equipment.
Operational Flexibility: Allows for isolated maintenance of specific system sections without needing a separate shut-off valve, saving space and cost.
Reduced Maintenance Costs: The corrosion-resistant materials and reliable design lead to extended service intervals and lower lifetime ownership costs.
Global Compatibility: Compliance with GB/T1855 and availability in common flange standards ensure easy integration into both new builds and retrofit projects worldwide.

Backed by our established manufacturing expertise since 2016 and an annual export value consistently ranging between US$1-1.5 million, Shanghai Zhibang Valve delivers products you can trust. Our valves are shipped from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring efficient logistics to our global clientele across North America, South America, Europe, Asia, Africa, and Oceania. Choosing our GB/T1855 compliant Marine Stop Check Valve means investing in a component that delivers proven reliability, protects your critical assets, and minimizes operational downtime. Contact us today to discuss your specific requirements and receive a competitive quotation.

Frequently Asked Questions (FAQ):

Q: What is the primary function of a stop check valve in a seawater system?
A: It serves a dual purpose: it allows an operator to manually stop the flow of seawater (like a gate valve) and also automatically acts as a check valve to prevent reverse flow when the system pressure drops, protecting equipment from damage.
Q: Why is compliance with the GB/T1855 standard important?
A: The GB/T1855 standard specifies requirements for marine valves, including materials, dimensions, pressure ratings, and testing. Compliance ensures the valve is suitable for marine service, offers reliable performance, and often guarantees interchangeability with other valves built to the same standard.
Q: Can this valve be used with fluids other than seawater?
A: Yes, while optimized for seawater, it is suitable for various non-aggressive liquids like fresh water, cooling water, and oil in marine and industrial applications, provided the material compatibility and pressure/temperature ratings are verified.
Q: What are the recommended maintenance procedures for this valve?
A: Routine maintenance typically involves periodic operational checks to ensure smooth opening/closing and visual inspection for external leaks. Depending on service conditions, internal inspection and seal replacement might be recommended during major system overhauls.
Q: Are different flange standards available for international projects?
A: Absolutely. We can supply valves with flanges conforming to various international standards such as EN, ASME, JIS, and others. Please specify your required standard when inquiring.
Q: How does the automatic check function work?
A: The valve utilizes a spring-assisted lift disc. Under forward flow pressure, the disc is lifted, allowing passage. If forward flow ceases or reverses, the spring and backpressure force the disc back onto its seat, creating a positive seal against reverse flow.
Q: Is the valve suitable for both above-deck and below-deck installations?
A: The standard materials (cast iron, bronze) are generally suitable for below-deck, protected environments. For exposed above-deck installations or more aggressive conditions, we recommend discussing stainless steel material options for enhanced durability.
Q: What is the typical lead time for an order of DN150 valves?
A: Lead times vary based on order quantity, specific material configuration, and current production schedule. Generally, standard configurations have shorter lead times. We provide accurate delivery estimates with every quotation.