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

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

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

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

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

Product Spotlights

GB/T1855 standard marine stop check valve for freshwater. Cast iron construction ensures durability. Dual function integrates shut-off and non-return mechanisms for system protection and simplicity. Available in DN50 to DN200 sizes with PN1.0MPa rating. Suitable for marine and industrial freshwater pipelines. Manufactured by ISO9001 certified company with global export experience.

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

Key Specifications

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Material:

Cast Iron

Standard:

Other, GB/T1855

Application:

Other, Freshwater systems

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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 Cast Iron

Standard Other, GB/T1855

Application Other, Freshwater systems

Function Other, Stop and check (non-return)

Flow Direction Other, Unidirectional

Size Range DN50 to DN200

Pressure Rating PN1.0MPa

Connection Type Flanged (typical)

Sealing Type Metal-to-metal or resilient (optional)

As a professional manufacturer with ISO9001 certified quality management, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in producing robust and reliable valves for demanding applications. Our GB/T1855 Marine Stop Check Valve for freshwater systems is engineered to provide secure backflow prevention and flow control in marine and industrial settings. With an annual export value demonstrating our global reach across North America, South America, Europe, Asia, Africa, and Oceania, we deliver products that meet international expectations for durability and performance.

This valve combines the functions of a stop valve and a check valve, offering a practical solution for pipelines where both flow regulation and prevention of reverse flow are necessary. Constructed from cast iron for strength and corrosion resistance in freshwater environments, it adheres to the GB/T1855 standard, ensuring dimensional and performance consistency.

Key Features & Technical Specifications:

Dual Function Design: Integrates a shut-off capability with a non-return (check) mechanism, simplifying system design and installation.
Robust Construction: Cast iron body provides excellent mechanical strength and suitability for freshwater applications without highly corrosive elements.
Standard Compliance: Manufactured according to GB/T1855, guaranteeing interchangeability and reliable performance metrics.
Size Flexibility: Available in a range of nominal diameters from DN50 to DN200, catering to various pipeline dimensions.
Pressure Rating: Designed for a nominal pressure of PN1.0MPa (10 bar), suitable for many standard freshwater system pressures.
Reliable Sealing: The check mechanism ensures tight closure against reverse flow, protecting pumps and upstream components.
Manual Operation: The stop function is typically operated via a handwheel, allowing for straightforward flow control.

Primary Advantages & Customer Benefits:

System Protection: Prevents backflow which can damage pumps, cause contamination, or disrupt system pressure.
Operational Convenience: One valve serves two purposes, reducing the number of components needed, saving space, and potentially lowering installation costs.
Durability & Long Service Life: The cast iron material and sturdy design ensure the valve withstands operational stresses over extended periods.
Wide Application Suitability: Ideal for freshwater lines on ships, in ports, water treatment plants, irrigation systems, and general industrial water supply networks.
Global Supply Capability: Supported by our established export channels from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely delivery to international markets.

Typical Technical Parameters Table:

Parameter	Specification / Range
Product Standard	GB/T1855
Nominal Diameter (DN)	50, 65, 80, 100, 125, 150, 200
Nominal Pressure (PN)	1.0 MPa
Main Body Material	Cast Iron
Primary Application Medium	Freshwater
Function	Stop (shut-off) & Check (non-return)
Typical Connection	Flanged
Operation (Stop part)	Manual (Handwheel)

Backed by our ISO9001 certification and nearly a decade of manufacturing experience since 2016, Shanghai Zhibang Valve guarantees a consistent and reliable product. Our presence in diverse global markets from Eastern Europe to Southeast Asia and North America underscores the adaptability and acceptance of our valves. This specific Marine Stop Check Valve offers a dependable, standardized solution for critical freshwater flow management. For detailed quotations, customization options, or to discuss your specific DN and pressure requirements, please contact our sales team.

Frequently Asked Questions (FAQ):

Q: What exactly is a "Stop Check Valve" and how does it work?
A: A Stop Check Valve combines two functions. It acts as a standard stop (or shut-off) valve that can manually close to block flow. Simultaneously, it incorporates an automatic check valve mechanism that prevents reverse flow (backflow) whenever the downstream pressure exceeds the upstream pressure, even if the manual stop is open.
Q: Is this valve suitable for seawater or other corrosive liquids?
A: This model is designed specifically for freshwater applications as per the title. The cast iron material is suitable for non-aggressive freshwater. For seawater or corrosive media, alternative materials like bronze or stainless steel would be recommended, which may be available upon request.
Q: Does the GB/T1855 standard imply compatibility with international standards?
A: GB/T1855 is a Chinese national standard for check valves. While it ensures quality and dimensional specifications within its framework, compatibility with specific international standards (like ANSI, DIN) should be verified based on flange dimensions and pressure ratings. Our valves are widely accepted in many international markets.
Q: What are the typical installation scenarios for this valve?
A: Common installations include pump discharge lines to prevent backflow through pumps when they stop, in boiler feedwater systems, in ship freshwater piping networks, and in industrial water supply lines where flow direction control is critical.
Q: Can the valve be installed in any orientation?
A: Check valve functionality typically requires specific orientation for proper operation (usually with flow direction arrow pointing correctly). The valve should be installed according to the flow direction marked on the body, and the stem/handwheel orientation should consider operational accessibility.
Q: What maintenance does this cast iron valve require?
A: Cast iron valves are known for durability and generally require minimal maintenance. Periodic inspection for external corrosion, checking the operation of the handwheel and stem, and ensuring the internal check mechanism is free from debris are recommended practices.
Q: Are other sizes or pressure ratings available beyond DN200 and PN1.0MPa?
A: The standard range offered is DN50 to DN200 at PN1.0MPa. Other sizes or higher pressure ratings may be available as customized products. Please inquire with us for specific requirements.
Q: What is the lead time for delivery, especially for export orders?
A: Lead times vary based on order quantity, specific size, and destination. With our shipment capabilities from multiple major Chinese ports, we strive to offer competitive lead times. Contact us for an estimated delivery schedule based on your order.