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Home > Industrial Equipment & Components > Valve > Check Valve > GB/T1855 Standard Marine Stop Check Valve For Freshwater, Cast Iron Body DN50 DN200 PN1.0MPa

GB/T1855 Standard Marine Stop Check Valve For Freshwater, Cast Iron Body DN50 DN200 PN1.0MPa

GB/T1855 Standard Marine Stop Check Valve For Freshwater, Cast Iron Body DN50 DN200 PN1.0MPa thumbnail-3

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GB/T1855 Standard Marine Stop Check Valve For Freshwater, Cast Iron Body DN50 DN200 PN1.0MPa photo-2

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GB/T1855 Standard Marine Stop Check Valve For Freshwater, Cast Iron Body DN50 DN200 PN1.0MPa photo-4

GB/T1855 Standard Marine Stop Check Valve For Freshwater, Cast Iron Body DN50 DN200 PN1.0MPa photo-5

Product Spotlights

GB/T1855 compliant marine stop check valve for freshwater systems. Features a robust cast iron body and dual stop/check functionality in one unit for space savings. Available in sizes DN50 to DN200 with a 1.0MPa pressure rating. Manufactured under ISO9001, ensuring reliability for global maritime applications. Ideal for shipbuilders and operators seeking a dependable, standard-compliant valve solution.

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

Key Specifications

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Standard:

Other, GB/T1855

Application:

Other, Freshwater systems on marine vessels

Flow Direction:

Other, Vertical or horizontal installation

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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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Standard Other, GB/T1855

Application Other, Freshwater systems on marine vessels

Flow Direction Other, Vertical or horizontal installation

Body Material Cast Iron

Nominal Diameter (DN) DN50 to DN200

Pressure Rating (PN) 1.0 MPa

Connection Type Flanged (common for marine valves)

Seat Material Optional (e.g., Nitrile Rubber, EPDM)

Disc Material Optional (e.g., Cast Iron, Ductile Iron)

Operation Mode Automatic (spring-loaded or swing type)

As a specialized manufacturer with a strong presence in global marine markets, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our GB/T1855 Standard Marine Stop Check Valve. Engineered for reliability in freshwater systems onboard vessels, this valve combines robust construction with precise functionality to meet the demanding conditions of maritime operations. Our commitment to ISO9001-certified manufacturing processes ensures that every valve delivers consistent performance and durability, supporting the smooth and safe operation of your marine fluid control systems.

Product Features and Technical Advantages:

Dual-Function Design: Integrates the features of a stop valve (isolation) and a check valve (preventing backflow) into a single unit, saving space and simplifying piping layouts.
Robust Cast Iron Construction: The body is manufactured from high-grade cast iron, offering excellent corrosion resistance against freshwater and providing long-term structural integrity.
Compliance with GB/T1855: Manufactured in strict adherence to the Chinese national standard for marine valves, ensuring compatibility and reliability for shipbuilding and repair projects, particularly in markets familiar with this standard.
Wide Size Range: Available in nominal diameters from DN50 to DN200, catering to various pipeline requirements in engine room cooling, ballast, firefighting, and general service freshwater systems.
1.0 MPa Pressure Rating: Suitable for low to medium-pressure freshwater applications commonly found on ships, barges, and offshore platforms.
Reliable Sealing: The valve is designed to provide tight shut-off when closed and effective one-way flow control when open, minimizing pressure drop and preventing water hammer.
Easy Operation and Maintenance: Features a standard handwheel for manual operation. The design allows for relatively easy maintenance or replacement of internal components like the disc and seat without removing the entire valve body from the pipeline.

Technical Specifications Table:

Parameter	Specification
Product Standard	GB/T1855
Body Material	Cast Iron
Nominal Diameter (DN)	DN50, DN65, DN80, DN100, DN125, DN150, DN200
Pressure Rating (PN)	1.0 MPa
Seat Material (Typical)	Nitrile Rubber / EPDM / Metal (Optional)
Disc Material (Typical)	Cast Iron / Ductile Iron
Test Pressure	Shell: 1.5 MPa; Seal: 1.1 MPa (Per standard)
Temperature Range	Suitable for freshwater at 0°C to 80°C
Operation	Manual (Handwheel)
Connection	Flanged (Standard as per GB/T)

Benefits for Our Clients:

Space and Cost Efficiency: The combined stop-check function reduces the number of valves and fittings needed, lowering installation costs and saving valuable space in tight engine rooms.
Enhanced System Safety: Prevents reverse flow effectively, protecting pumps and other sensitive equipment from damage. The positive shut-off capability allows for safe isolation during maintenance.
Reduced Maintenance Downtime: Durable materials and reliable design lead to a longer service life and fewer failures, minimizing operational interruptions for vessel owners and operators.
Global Supply Assurance: With annual export values between US$1-1.5 million and shipments from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely delivery to your location, whether in North America, Europe, Southeast Asia, Africa, or beyond.

Backed by our ISO9001 quality management system and nearly a decade of manufacturing expertise since 2016, Shanghai Zhibang's Marine Stop Check Valve represents a dependable choice for shipbuilders, shipyards, and marine equipment suppliers worldwide. Our proven track record of supplying to diverse markets across five continents underscores our capability to understand and meet international marine standards and client requirements. We invite you to experience the reliability and value of our valves. Contact us today to discuss your specific DN size needs, request a detailed quotation, or learn more about our full range of marine valve solutions.

Frequently Asked Questions (FAQ):

Q: What is the primary function of this marine stop check valve?
A: It serves two main functions: firstly, as a manual shut-off (stop) valve to completely isolate a section of pipeline. Secondly, it acts as an automatic check valve, allowing flow in one direction only and preventing backflow when the system pressure drops.
Q: Is this valve suitable for seawater applications?
A: This specific model is designed and constructed for freshwater systems. The cast iron body provides good corrosion resistance in freshwater, but for seawater, valves with materials like bronze, stainless steel, or specially coated cast iron are typically recommended. Please inquire about our seawater-grade options.
Q: How does the GB/T1855 standard benefit international buyers?
A: GB/T1855 is a recognized Chinese national standard for marine valves. Many shipyards, especially in Asia and for vessels destined for certain markets, specify or accept valves built to this standard. It ensures a defined level of quality, dimensions, and performance, providing assurance of compatibility and reliability.
Q: Can this valve be installed in both horizontal and vertical pipelines?
A: Yes, the design typically allows for installation in both orientations. However, for optimal check valve function and to ensure the disc closes properly by gravity or spring force, it is advisable to follow the installation instructions provided. The flow direction arrow on the valve body must be observed.
Q: What are the available end connections?
A: These valves are commonly supplied with flanged ends, conforming to standard flange dimensions (e.g., GB, ANSI, JIS) as required. The specific flange standard can be confirmed at the time of order based on your piping system.
Q: Are spare parts like seals and discs readily available?
A: Yes, as the manufacturer, we maintain an inventory of common spare parts. We recommend keeping a set of critical seals (like the seat ring) as part of your vessel's spare parts kit to facilitate quick maintenance.
Q: What is your typical lead time for an order of DN100 valves?
A: Lead times vary based on order quantity and current production schedule. For standard sizes like DN100, we often have stock or can produce within a few weeks. We provide accurate lead time estimates with every quotation.
Q: Do you offer customization, such as different pressure ratings or special coatings?
A: Yes, we have customization capabilities. While the standard model is PN1.0MPa, other pressure classes can be explored. Special internal or external coatings for enhanced corrosion protection can also be arranged upon request. Please discuss your specific needs with our technical sales team.