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

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

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Product Spotlights

GB/T1855 compliant marine valve combining stop and check functions for freshwater systems. Available in DN50-DN200 sizes with PN1.0MPa rating. Features robust materials (cast steel/stainless steel), flanged connections, and automatic backflow prevention. Simplifies piping design, enhances safety, and is backed by ISO9001 manufacturing from a globally exporting supplier.

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

Key Specifications

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Standard:

Other, GB/T1855

Application:

Other, Marine freshwater systems

Material:

Other, Cast steel or stainless steel

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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
Company Profile
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Standard Other, GB/T1855

Application Other, Marine freshwater systems

Material Other, Cast steel or stainless steel

Function Other, Stop check (prevent reverse flow)

Pressure Rating PN1.0MPa

Size Range DN50 to DN200

Connection Type Flanged

Design Globe or angle pattern

As a leading manufacturer established in 2016, Shanghai Zhibang Valve Manufacture Co., Ltd specializes in producing high-quality valves for demanding marine applications. Our GB/T1855 Marine Stop Check Valves for freshwater systems are engineered to provide reliable, one-way flow control and prevent dangerous reverse flow in ship piping networks. With an annual export value exceeding US$1 million and ISO9001-certified production processes, we ensure every valve meets stringent performance and durability standards for global clients across North America, Europe, Asia, and beyond.

Product Overview & Core Advantages:
This valve combines the functions of a stop valve and a check valve, crucial for marine freshwater lines where both flow regulation and backflow prevention are essential. Its design ensures operational safety and system integrity.

Dual Functionality: Acts as a shut-off valve for manual flow control while automatically preventing reverse flow when pressure differentials occur.
Robust Construction: Manufactured from materials like cast steel or stainless steel to withstand marine environments, including corrosion from treated freshwater.
Standard Compliance: Designed according to the Chinese national standard GB/T1855 for marine valves, ensuring compatibility and reliability in shipbuilding specifications.
Precision Engineering: Features a tight-sealing mechanism that minimizes leakage, maintaining system pressure and efficiency.
Operational Safety: The check function automatically engages, protecting pumps and other equipment from damage due to backflow.

Technical Specifications & Detailed Parameters:
The valve is available in a range of sizes to suit various pipeline diameters within marine freshwater systems.

Parameter	Specification / Range
Product Standard	GB/T1855
Nominal Diameter (DN)	50, 65, 80, 100, 125, 150, 200
Pressure Rating (PN)	1.0 MPa (10 bar)
Primary Application	Freshwater systems on ships and marine platforms
Common Material Options	Cast Steel (WCB), Stainless Steel (304/316)
Connection Type	Flanged (RF or FF), dimensions per standard
Temperature Range	Typically -20°C to 120°C, depending on material
Seat & Disc Design	Metal-to-metal or soft seat for tight sealing
Operation Mode	Manual handwheel for stop function; automatic check function

Benefits for Your Marine Projects:

Simplified System Design: One valve replaces two, saving space, weight, and installation costs in compact marine environments.
Enhanced Reliability: The integrated design reduces potential failure points compared to using separate stop and check valves.
Maintenance Efficiency: Streamlined design allows for easier inspection and servicing.
Global Supply Assurance: With major shipment ports in Shanghai, Guangzhou, Hongkong, and Beijing, we offer flexible logistics to meet your project timelines worldwide.

Trust & Performance Commitment:
Shanghai Zhibang's commitment to quality is backed by our ISO9001 certification and a track record of supplying valves to diverse markets, from Eastern Europe to Oceania. Our annual export volume reflects the trust of international buyers in our products' performance and durability. When you choose our GB/T1855 Marine Stop Check Valve, you are selecting a component designed for long-term, trouble-free operation in critical freshwater applications, supported by a manufacturer with proven global delivery capabilities. Contact us today to discuss your specific DN and material requirements.

Frequently Asked Questions (FAQ):

Q: What exactly is a "stop check" valve, and how does it differ from a standard check valve?
A: A stop check valve incorporates two functions: it can be manually closed like a stop (globe) valve to shut off flow completely, and it also contains a check valve mechanism that automatically closes to prevent reverse flow when downstream pressure exceeds upstream pressure. A standard check valve only provides the automatic backflow prevention function.
Q: Is this valve suitable for seawater applications?
A: This specific model is designed for freshwater systems as per GB/T1855. For seawater, different material specifications (such as higher-grade stainless steel) and potentially different standards would be required. We offer valves for various media; please inquire for seawater-specific solutions.
Q: What are the available end connection types?
A: The standard connection for these sizes (DN50 to DN200) is flanged, with raised face (RF) or flat face (FF) finishes according to common flange standards. Other connection types may be customizable upon request.
Q: Can the valve be operated remotely or automatically?
A: The primary design features a manual handwheel for the stop function. The check function is entirely automatic based on pressure. For remote operation of the stop function, modifications like actuator attachment are possible as a customizable option.
Q: What is the typical delivery lead time for these valves?
A> Lead times vary based on specific size, material, and order quantity. With our manufacturing base in Shanghai and multiple export ports, we generally maintain efficient production and shipping schedules. Please contact us for a precise timeline based on your order.
Q: Does the 1.0MPa pressure rating cover both the stop and check functions?
A: Yes, the PN1.0MPa rating indicates the valve's design pressure for both its manual shut-off capability and its automatic check function under normal operating conditions.
Q: Are spare parts like seals or gaskets readily available?
A: Yes, as the manufacturer, we provide comprehensive support and can supply all necessary spare parts to ensure long-term maintenance and serviceability of the valve.
Q: What documentation is provided with the valve?
A> Standard documentation includes a material test report, dimensional drawings, and a certificate of conformity. More detailed test reports or certifications are available upon request.