Contact Platform Support
Help Center
Home > Industrial Equipment & Components > Valve > Check Valve > Industrial Ductile Iron Stop Check Valve for Marine Pipeline Systems, GB/T1855
Industrial Ductile Iron Stop Check Valve for Marine Pipeline Systems, GB/T1855
Product Spotlights
Integrates stop and check functions in one robust ductile iron body for marine systems, saving space and weight. Complies with GB/T1855, features corrosion-resistant trim for seawater durability, and offers optional automation. Enhances pipeline safety by preventing reverse flow while allowing positive isolation, backed by ISO9001 manufacturing and global export experience.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
Get Latest Price
Application:
Other, Marine Pipeline Systems
Standard:
Other, GB/T1855
Body Material:
Ductile Iron
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
Related Products
-
Ductile Iron Stop Check Valve With Mill Test Report, Conforms to GB/T1855NegotiableMOQ: 1 Unit -
GB/T1855 Valve for Water Supply and Fire Protection Pipelines, Ductile Iron ConstructionNegotiableMOQ: 1 Unit
-
GB/T1855 Compliant Valve With 12-Month Warranty, Epoxy Coated for Corrosion ResistanceNegotiableMOQ: 1 Unit
-
DN80 Cast Iron Stop Check Valve for Marine Applications, GB/T1855 CompliantNegotiableMOQ: 1 Unit
-
GB/T1855 Flanged Stop Check Valve, DN50 to DN200 Size Range for Marine Pump LinesNegotiableMOQ: 1 Unit
Application
Other, Marine Pipeline Systems
Standard
Other, GB/T1855
Body Material
Ductile Iron
Valve Type
Stop Check Valve
Connection Type
Flanged (typical)
Pressure Class
PN16/PN25 (common)
Operation
Manual or Actuated (optional)
Seat Material
Stainless Steel or Enhanced Seal
As a dedicated valve manufacturer since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in engineering robust flow control solutions for demanding industrial environments. Our Industrial Ductile Iron Stop Check Valve, designed specifically for marine pipeline systems and manufactured in compliance with the GB/T1855 standard, represents a critical component for ensuring system safety and reliability. This valve combines the functions of a stop valve and a check valve, providing superior protection against reverse flow while allowing for positive shut-off, making it an indispensable asset for shipboard piping, offshore platforms, and coastal infrastructure.
Engineered for durability in corrosive marine atmospheres and with high-strength ductile iron construction, this valve offers a reliable safeguard for your piping networks. Its integrated design simplifies installation, reduces potential leak points, and enhances overall system integrity. We understand the critical nature of marine applications where failure is not an option, which is why this product is built to deliver consistent performance under pressure, temperature fluctuations, and harsh conditions.
Core Features & Technical Advantages:
- Dual-Function Design: Acts as both a reliable shut-off (stop) valve and a non-return (check) valve, eliminating the need for two separate components and saving space.
- Superior Material Construction: The valve body is crafted from high-grade ductile iron (nodular cast iron), known for its excellent tensile strength, impact resistance, and durability compared to standard cast iron, providing a longer service life in demanding marine environments.
- Marine-Grade Corrosion Resistance: Critical internal components, such as the seat and disc, are often furnished with stainless steel or other corrosion-resistant alloys to withstand seawater, brackish water, and other aggressive fluids common in marine systems.
- GB/T1855 Standard Compliance: Manufactured according to the Chinese national standard GB/T1855 for iron gate valves, ensuring dimensional interchangeability, specified material grades, and performance benchmarks recognized in many international markets.
- Bubble-Tight Sealing: Features a precision-machined seat and disc interface that ensures leak-proof closure in both the stop and check functions, preventing media loss and protecting downstream equipment.
- Flexible Operation: Typically operated via a handwheel for manual control, with options for gear operators or pneumatic/hydraulic/electric actuators for remote or automated operation, adapting to various levels of automation on vessels or platforms.
- Robust Stem Design: Incorporates a rising stem mechanism that provides visual indication of valve position (open or closed) and is designed to resist seizing and galling, even after prolonged periods of inactivity.
- Flanged Connection: Standard flanged ends (e.g., ANSI, JIS, DIN, or GB standards) facilitate secure, bolted connections to the pipeline, ensuring a robust and pressure-tight joint that is maintainable.
Detailed Specifications & Configurations:
| Parameter | Specification / Option |
|---|---|
| Valve Type | Stop Check Valve (Globe Pattern Common) |
| Body Material | Ductile Iron (QT400-18, QT450-10, or equivalent) |
| Size Range | Commonly available from DN50 (2") to DN600 (24") |
| Pressure Rating | PN10, PN16, PN25, PN40 (or corresponding Class 150, 300) |
| Seat/Disc Material | Stainless Steel (304/316), Bronze, or Ductile Iron with Seal |
| Stem Material | Stainless Steel (common) |
| End Connection | Flanged (RF, FF), specific standard customizable |
| Operating Temp Range | -20°C to +200°C (dependent on seat material) |
| Applicable Media | Sea Water, Fresh Water, Oil, Gas, Steam (compatible) |
Benefits for Your Marine Operations:
- Enhanced System Safety: Prevents dangerous reverse flow scenarios (water hammer, backflow) which can damage pumps, compressors, and other equipment, while allowing for positive isolation for maintenance.
- Space and Cost Efficiency: Replaces two valves (a gate/globe valve plus a check valve) with one unit, reducing weight, footprint, installation time, and overall procurement costs.
- Reduced Maintenance: The robust ductile iron construction and corrosion-resistant trim minimize wear and degradation, leading to fewer replacements and lower lifecycle costs.
- Operational Flexibility: The manual override feature (via handwheel) ensures control even if automated systems fail, a critical factor for marine safety protocols.
- Global Supply Compatibility: Adherence to GB/T1855 and common flange standards ensures the valve can integrate into both new builds and retrofit projects worldwide.
Frequently Asked Questions (FAQ):
-
Q: What is the primary advantage of a stop check valve over separate stop and check valves?
A: The key advantage is integration. It saves significant space and weight—critical on ships—and reduces the number of potential leak paths (flanges, connections) by half. It also simplifies operation and procurement. -
Q: Is ductile iron suitable for full seawater immersion service?
A: Ductile iron offers excellent strength and impact resistance. For prolonged seawater immersion, the valve body is typically protected with suitable coatings (epoxy, etc.), and the critical wetted internal parts are made from stainless steel or other seawater-resistant alloys. -
Q: Can this valve be supplied with actuators for automated control?
A: Yes. We can provide this stop check valve configured with mounting pads for pneumatic (double-acting or spring-return), hydraulic, or electric actuators. The specific actuator type can be selected based on your available power source and control requirements. -
Q: How does the "stop" function differ from a standard gate or globe valve?
A: The stop function operates identically to a globe valve. When the handwheel is turned to close, the disc is forced onto the seat, providing a positive, bubble-tight shut-off. The valve can be held in any intermediate position for throttling if required. -
Q: What standards are the flanges compatible with?
A: We commonly manufacture flanges to GB, ANSI, JIS, or DIN standards. The specific standard, pressure class (PN/Class), and facing (RF, FF) can be specified at the time of order to match your existing pipeline flanges. -
Q: What is the lead time for a custom-sized or specially coated valve?
A: Standard sizes and configurations typically have shorter lead times. For customized orders involving special coatings, exotic trim materials, or non-standard dimensions, please contact us directly for an accurate production schedule based on your detailed requirements. -
Q: Do you provide documentation like test reports and material certificates?
A: Yes. As an ISO9001 certified manufacturer, we provide essential documentation including material test reports (MTR), hydrostatic test reports, and a full set of operational manuals. Third-party inspection can be arranged upon request. -
Q: What after-sales support do you offer for marine clients?
A: We provide detailed installation guidelines, maintenance recommendations, and spare parts lists. Technical support is available for troubleshooting. For critical marine applications, we can discuss extended warranty or service agreements.
Backed by our ISO9001 quality management system and nearly a decade of manufacturing expertise, Shanghai Zhibang Valve delivers products that meet rigorous international standards. Our valves are trusted by clients across North America, Europe, Southeast Asia, Africa, and Oceania, with an annual export value consistently ranging between US$1 million and US$1.5 million. We ensure reliable logistics through major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, facilitating smooth delivery to your project site anywhere in the world. Choose our Industrial Ductile Iron Stop Check Valve for a robust, space-saving, and highly reliable solution that protects your marine pipeline investment. Contact us today for a detailed quotation or to discuss your specific application requirements.
Send Inquiry to This Supplier
1Yr
Business Type
Manufacturer
Year Established
2016
Annual Export Value
US$1 Million - US$1.5 Million
Product Certifications
ISO9001
You May Also Like
-
Cast Steel Marine Stop Check Valve for Pump Protection, Compliant With GB/T1855 StandardNegotiableMOQ: 1 Unit
-
GB/T1855 Marine Stop Check Valve With One-Year Warranty Against DefectsNegotiableMOQ: 1 Unit
-
Stop Check Valve for Seawater Cooling Pump Systems on Vessels, GB/T1855 StandardNegotiableMOQ: 1 Unit
-
Marine Stop Check Valve for Pump, GB/T1855 Compliant With Technical Data SheetNegotiableMOQ: 1 Unit
-
Industrial Cast Iron Stop Check Valve, GB/T1855 Compliant, Flanged Ends DN80-DN150NegotiableMOQ: 1 Unit
-
GB/T1855 Marine Stop Check Valve for Pump Systems, Cast Iron Body, PN1.0MPaNegotiableMOQ: 1 Unit
-
Marine Engine Room Pump Protection Valve, Installs in Discharge Line per GB/T1855NegotiableMOQ: 1 Unit
-
Marine Pump Stop Check Valve With Mill Test Report, Manufactured to GB/T1855NegotiableMOQ: 1 Unit
-
Precision Machined GB/T1855 Stop Check Valve, Cast Iron Body, PN1.0MPa Pressure ClassNegotiableMOQ: 1 Unit
-
GB/T1855 Marine Valve for Pump Suction Lines, Prevents Backflow on Pump ShutdownNegotiableMOQ: 1 Unit
