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Home > Industrial Equipment & Components > Valve > Check Valve > Ductile Iron GB/T1855 Marine Check Valve With Non-Return Function

Ductile Iron GB/T1855 Marine Check Valve With Non-Return Function

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Product Spotlights

GB/T1855 compliant marine check valve crafted from durable ductile iron for superior strength in harsh saltwater environments. Features a reliable non-return mechanism to prevent backflow, protecting critical shipboard systems. Available in a wide DN50-DN600 size range with customizable pressure ratings (PN10-PN25) and international flange standards. Manufactured under ISO9001 with global export expertise, ensuring dependable performance and seamless integration for marine applications worldwide.

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

Key Specifications

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Material:

Other, Ductile Iron

Standard:

Other, GB/T1855

Function:

Other, Non-Return / Check

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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, Ductile Iron

Standard Other, GB/T1855

Function Other, Non-Return / Check

Application Other, Marine Pipeline Systems

Connection Type Flanged (common), Threaded (optional)

Pressure Rating PN10, PN16, PN25 (customizable)

Size Range DN50 to DN600 (2“ to 24“)

End Connection Standard GB, ANSI, JIS, DIN (available)

Temperature Range -20°C to 120°C

Coating/Finish Epoxy Coated, Galvanized (optional)

As a leading manufacturer with a strong foothold in the global valve market, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our specialized Ductile Iron GB/T1855 Marine Check Valve. Engineered for reliability in demanding marine environments, this valve is a critical component for ensuring unidirectional flow and protecting sensitive equipment aboard vessels and in offshore installations. With our ISO9001-certified manufacturing processes and a decade of industry experience since 2014, we deliver valves that combine robust construction, precise performance, and long-term durability, offering shipbuilders and marine engineers a dependable solution for their fluid control needs.

Our marine check valve is meticulously designed to meet the rigorous standards of maritime applications. The non-return function is its core purpose, preventing backflow which could lead to pump damage, system inefficiency, or even hazardous situations. Crafted from high-grade ductile iron, the valve body offers superior strength and impact resistance compared to standard cast iron, making it ideal for withstanding the corrosive and high-pressure conditions often encountered at sea.

Key Features & Technical Advantages:

Robust Ductile Iron Construction: Provides excellent tensile strength, toughness, and resistance to shock loads, ensuring longevity in harsh marine service.
GB/T1855 Compliance: Manufactured in accordance with the Chinese national standard for iron and steel check valves, guaranteeing dimensional accuracy, performance consistency, and interchangeability.
Reliable Non-Return Mechanism: Features a precision-engineered swing disc or lift design (depending on model) that allows forward flow with minimal pressure drop and automatically seals tightly to prevent reverse flow.
Marine-Grade Protection: Standard epoxy coating offers effective corrosion resistance against saltwater, while optional galvanization or specialized coatings are available for enhanced protection.
Versatile Connection Options: Primarily supplied with flanged ends per GB standards, but can be configured to meet ANSI, JIS, or DIN specifications upon request, ensuring global compatibility.
Low Maintenance Design: Simple internal structure allows for easy inspection and maintenance, reducing downtime and operational costs.

Technical Specifications Table:

Parameter	Specification
Body Material	Ductile Iron (QT400-18, QT450-10)
Disc Material	Ductile Iron / Stainless Steel (optional)
Seat Material	NBR, EPDM, Viton (customizable)
Design Standard	GB/T 1855
Pressure Rating (PN)	PN10, PN16, PN25
Size Range (DN)	DN50, DN80, DN100, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600
Temperature Range	-20°C to 120°C (standard); wider ranges available
End Connection	Flanged (GB/T 17241), Threaded (NPT, BSPT/BSPP optional)
Face-to-Face Dimension	Per GB/T 12221 standard
Test Standard	GB/T 13927 (Shell Test, Seat Test)

Benefits for Your Marine Operations:

System Protection: Safeguards pumps, compressors, and other equipment from damage caused by reverse flow or water hammer.
Operational Safety: Ensures the intended direction of fluid flow in critical systems like ballast, bilge, cooling, and fuel lines.
Reduced Energy Consumption: Minimizes pressure loss during forward flow, contributing to overall system efficiency.
Global Supply Chain Compatibility: Our valves are shipped from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, facilitating smooth logistics to our main markets across North and South America, Europe, Asia, Africa, and Oceania.

Trust in Zhibang Valve is built on a solid foundation. As an established manufacturer since 2016, we have consistently achieved an annual export value between US$1 Million and US$1.5 Million, a testament to the reliability and quality demanded by our international clientele. Our ISO9001 certification underpins our commitment to consistent quality control in every production batch. Choosing our Ductile Iron Marine Check Valve means selecting a component backed by proven manufacturing expertise, global logistical support, and a product designed to perform under pressure. Contact us today to discuss your specific requirements and experience the Zhibang difference in marine fluid management.

Frequently Asked Questions (FAQ):

Q: What is the main advantage of using ductile iron over cast iron for a marine check valve?
A: Ductile iron offers significantly higher tensile strength, impact resistance, and elongation properties. This makes it less brittle and more resistant to cracking under shock loads or pressure surges common in marine piping systems, leading to a safer and more durable valve.
Q: Can this valve be used with media other than seawater?
A: Absolutely. While designed for marine environments, it is suitable for a wide range of fluids including fresh water, oil, gas, and certain chemicals, provided the fluid is compatible with the valve's construction materials (body, disc, seat). Please consult our technical team for specific media compatibility.
Q: Are the flanges compatible with international standards like ANSI or DIN?
A: Yes. While our standard offering complies with GB standards, we regularly produce valves with flanges machined to ANSI, JIS, or DIN specifications. This is a common customization to ensure seamless integration into existing global shipboard systems.
Q: What is the typical lead time for an order?
A: Lead times vary based on order quantity, size, and customization requirements. For standard sizes and specifications, we generally maintain stock for faster delivery. We provide accurate lead time estimates upon receipt of your detailed inquiry.
Q: Does the valve require regular maintenance?
A: It is designed for low maintenance. However, periodic inspection is recommended as part of a routine marine system maintenance schedule to check for seal wear or debris accumulation, ensuring optimal performance over its long service life.
Q: Can you provide documentation such as material certificates and test reports?
A> Yes. As an ISO9001-certified manufacturer, we can provide standard documentation including material test reports (MTRs) and factory acceptance test reports per GB/T 13927. Certificates of Conformity are also available upon request.
Q: What is the difference between a swing check valve and a lift check valve in your range?
A> Our marine line primarily features swing check valves, where the disc swings on a hinge. They offer low flow resistance. Lift check valves, where the disc lifts vertically, are better for pulsating flows. We can advise on the best type for your specific application parameters.
Q: Do you offer any warranty on your marine check valves?
A> We stand behind the quality of our products. A standard warranty period is provided against manufacturing defects. The specific terms and duration will be detailed in our commercial contract.