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

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

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

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GB/T1855 DN50 DN200 Marine Stop Check Valve For Freshwater, Flanged Connection PN1.0MPa photo-1

GB/T1855 DN50 DN200 Marine Stop Check Valve For Freshwater, Flanged Connection PN1.0MPa photo-2

GB/T1855 DN50 DN200 Marine Stop Check Valve For Freshwater, Flanged Connection PN1.0MPa photo-3

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

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

Product Spotlights

GB/T1855 compliant marine stop check valve for freshwater. Dual-function design combines check and isolation in one unit, saving space and cost. Features flanged connections (DN50-DN200, PN1.0MPa), robust construction for marine environments, and reliable backflow prevention. Manufactured under ISO9001, ideal for global shipbuilding and repair applications.

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

Key Specifications

Get Latest Price

Application:

Other, Marine Freshwater Systems

Product Standard:

GB/T1855

Connection Type:

Flanged

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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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Application Other, Marine Freshwater Systems

Product Standard GB/T1855

Connection Type Flanged

Nominal Diameter (DN) DN50, DN65, DN80, DN100, DN125, DN150, DN200

Pressure Rating (PN) PN1.0 MPa

Valve Type Stop Check Valve

Body Material Cast Iron / Ductile Iron (Optional)

Seal Material Nitrile Rubber / EPDM (Optional)

Operation Mode Lift Check, Manual Stop

As a leading manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in producing high-performance marine valves for global clients. Our GB/T1855 DN50-DN200 Marine Stop Check Valve is engineered to deliver reliable, unidirectional flow control in freshwater systems aboard vessels. Combining the functions of a check valve and a stop valve, it offers superior safety and operational flexibility, making it an essential component for shipbuilders, repair yards, and marine equipment suppliers seeking durable and compliant solutions.

Core Product Features & Technical Advantages:

Dual-Function Design: Acts as both a non-return check valve to prevent backflow and a manual isolation (stop) valve, simplifying piping layouts and reducing the need for separate valves.
Robust Construction for Marine Environments: Designed to withstand the corrosive and high-vibration conditions typical of marine applications. Standard body materials include high-grade cast iron, with ductile iron or other materials available upon request for enhanced strength.
Flanged Connection for Secure Installation: The flanged ends ensure a leak-proof, bolted connection that is easy to install, maintain, and inspect, conforming to common marine piping standards.
Precise Flow Control: The lift check mechanism ensures quick, positive sealing upon flow reversal, minimizing water hammer and protecting pumps and other upstream equipment.
Compliance with Recognized Standards: Manufactured in accordance with the Chinese GB/T1855 standard for marine valves, ensuring dimensional interchangeability and performance reliability recognized in many international markets.

Detailed Technical Specifications:

Parameter	Specification
Product Model / Standard	GB/T1855 Marine Stop Check Valve
Nominal Diameter (DN)	DN50, DN65, DN80, DN100, DN125, DN150, DN200
Pressure Rating (PN)	PN1.0 MPa (10 bar)
Connection Type	Flanged (RF face common)
Suitable Medium	Freshwater
Operation Temperature Range	-20°C to +120°C (dependent on seal material)
Body Material (Typical)	Cast Iron (HT200/250), Ductile Iron (QT450-10) optional
Disc & Stem Material	Bronze or Stainless Steel
Seal Material	NBR (Nitrile), EPDM (Standard for freshwater)
Operation	Manual handwheel for stop function; Automatic check function

Benefits for Your Marine Projects:

Enhanced System Safety: Prevents backflow contamination and protects pumps from damage, contributing to the overall safety and integrity of the freshwater system.
Space and Cost Efficiency: The integrated stop-check design saves valuable space in engine rooms and piping runs and can reduce procurement and installation costs compared to using two separate valves.
Reduced Maintenance: The robust design and quality materials minimize wear, leading to longer service intervals and lower lifetime operating costs.
Global Supply Compatibility: With an annual export value between US$1-1.5 million and shipments from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, we reliably supply valves to key markets worldwide, including North America, Europe, Southeast Asia, and the Middle East.

Trusted Manufacturer Backing:

Shanghai Zhibang Valve, established in 2016, has built a strong reputation by adhering to a strict ISO9001 quality management system. Our valves are trusted by partners across diverse global markets, from Eastern Europe and Africa to Oceania and the Americas. This specific Marine Stop Check Valve embodies our commitment to delivering compliant, durable, and value-driven products. By choosing our valve, you are not just purchasing a component; you are securing a reliable partnership with a manufacturer dedicated to supporting your marine engineering needs with consistent quality and professional service.

Frequently Asked Questions (FAQ):

Q: What is the main advantage of a stop check valve over a standard check valve?
A: The primary advantage is operational control. A standard check valve operates automatically. A stop check valve allows manual closure via its handwheel, enabling you to completely isolate a line for maintenance or emergency purposes while retaining the automatic check function.
Q: Is this valve suitable for seawater applications?
A: This specific model is designed for freshwater systems as indicated. For seawater, different body and seal materials (such as bronze body and special seals) would be required to resist higher corrosion. Please inquire for seawater-rated options.
Q: Do you provide certificates for the materials and pressure testing?
A: Yes, as an ISO9001 certified manufacturer, we can provide standard material certificates and factory hydrostatic test reports for the valves upon request.
Q: What are the flange standards? Are they compatible with ISO, ANSI, or JIS standards?
A: The flanges are manufactured to the dimensions specified in GB/T1855, which are generally compatible with common international standards like ISO and certain ANSI classes for the corresponding pressure rating. Detailed flange face and drilling details can be provided for your compatibility check.
Q: Can I order sizes outside the DN50-DN200 range?
A: Our standard production covers DN50 to DN200. Sizes smaller than DN50 or larger than DN200 may be available as a custom order. Please contact our sales team with your specific requirements.
Q: What is the typical lead time for an order?
A: For standard sizes and materials, lead times are competitive, typically ranging from 30 to 45 days depending on order quantity. We ship from major Chinese ports for efficient global logistics.
Q: Are other pressure ratings (like PN1.6MPa) available?
A: Yes, we produce marine check valves in different pressure classes. PN1.6MPa and other ratings are available. Please specify your required pressure rating when inquiring.
Q: Do you offer any customization, such as special coatings or locking devices?
A: Customization is possible, including epoxy coatings, locking devices on the handwheel, or specific packing materials. Discuss your project needs with our engineering team for a tailored solution.