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Home > Industrial Equipment & Components > Valve > Check Valve > Corrosion-Resistant Stop Check Valve For Seawater Service Featuring 316L Trim And Ductile Iron

Corrosion-Resistant Stop Check Valve For Seawater Service Featuring 316L Trim And Ductile Iron

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Corrosion-Resistant Stop Check Valve For Seawater Service Featuring 316L Trim And Ductile Iron photo-5

Product Spotlights

Engineered for harsh seawater service, this stop check valve combines a high-strength ductile iron body with corrosion-resistant 316L stainless steel trim. It provides reliable dual-function operation (isolation and backflow prevention), ensures bubble-tight shut-off, and is built to industry standards (API 594/6D) for long service life and reduced maintenance in marine and offshore applications.

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

Key Specifications

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Application:

Other, Seawater Service

Standard:

Other, API 594, API 6D, ISO9001 Certified

Body Material:

Ductile Iron

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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, Seawater Service

Standard Other, API 594, API 6D, ISO9001 Certified

Body Material Ductile Iron

Trim Material 316L Stainless Steel

Valve Type Stop Check Valve

Pressure Rating Class 150, Class 300

End Connection Flanged

Seat Type Metal to Metal

As a dedicated manufacturer with a strong commitment to quality and reliability, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our advanced Corrosion-Resistant Stop Check Valve engineered specifically for demanding seawater service. Established in 2016 and backed by ISO9001 certification, we understand the critical need for durable and dependable fluid control in harsh marine and offshore environments. This valve is meticulously designed to combine the superior strength of ductile iron with the exceptional corrosion resistance of 316L stainless steel trim, offering a robust solution that ensures long-term operational integrity and minimizes maintenance costs. Trust Zhibang Valve to deliver products that meet the rigorous standards of global markets across North America, Europe, Asia, and beyond.

Our seawater service stop check valve is built to excel where ordinary valves fail. It serves the dual function of a stop valve (isolation) and a check valve (preventing reverse flow), making it an essential component for pump discharge lines, cooling water systems, and other critical seawater applications. The core of its reliability lies in the strategic material selection and precision engineering.

Key Features & Technical Advantages:

Superior Corrosion Resistance: The 316L stainless steel trim (including seat, disc, and stem) provides outstanding resistance to chloride-induced pitting and crevice corrosion, which is paramount in seawater containing high levels of chlorides and other aggressive agents.
High-Strength Body Construction: The ductile iron body offers an excellent balance of strength, toughness, and impact resistance, significantly outperforming standard cast iron, especially in high-pressure seawater lines.
Reliable Dual-Function Design: Functions as both an isolation valve and a non-return check valve. The valve can be manually closed to stop flow or will automatically close to prevent backflow when upstream pressure drops, protecting pumps and equipment.
Bubble-Tight Shut-Off: Features a metal-to-metal seat design that ensures leak-tight closure in both the fully closed (stop) and check valve modes, essential for system safety and efficiency.
Robust Stem & Yoke Design: Engineered for easy operation and durability, even in frequently cycled applications. The design minimizes stem binding and ensures reliable performance over extended periods.
Compliance with Industry Standards: Manufactured following recognized standards such as API 594 (Check Valves) and API 6D, ensuring dimensional interchangeability and performance reliability.

Technical Specifications Table:

Parameter	Specification
Valve Type	Stop Check Valve (Swing Type)
Body Material	Ductile Iron
Trim Material	316L Stainless Steel
Pressure Class	Class 150, Class 300 (Available)
End Connection	Flanged (RF or FF), dimensions per ASME B16.1/ASME B16.5
Seat Type	Metal Seat (Bubble Tight Shut-off)
Size Range	2" to 24" (Custom sizes available upon request)
Temperature Range	Suitable for typical seawater service temperatures
Operation	Manual (Handwheel), Gear Operator Optional

Benefits for Your Operations:

Extended Service Life: The corrosion-resistant construction drastically reduces the rate of degradation, leading to a longer valve lifespan and lower total cost of ownership.
Enhanced System Safety: Prevents damaging reverse flow and provides secure isolation, protecting expensive pumps, compressors, and pipelines from water hammer and other flow-related issues.
Reduced Maintenance Downtime: The durable materials and robust design minimize the frequency of repairs and replacements, ensuring higher system availability and productivity.
Global Supply Capability: With annual export values between US$1-1.5 million and shipment ports including Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure timely and efficient delivery to your project site, wherever it is located.

Choosing Shanghai Zhibang Valve means partnering with a proven manufacturer whose products are trusted across diverse and demanding international markets, from North America and Europe to Southeast Asia and Africa. Our ISO9001-certified quality management system underpins every valve we produce, guaranteeing consistent performance and adherence to specifications. The combination of ductile iron strength and 316L stainless steel's corrosion defense creates a valve solution engineered not just to function, but to endure. For a reliable, long-lasting component that safeguards your seawater systems against the challenges of a corrosive marine environment, contact us today to discuss your requirements or request a detailed quotation.

Frequently Asked Questions (FAQ)

Q: What is the primary advantage of using a stop check valve over a standard check valve?
A: A stop check valve provides manual isolation capability in addition to automatic backflow prevention. This allows operators to positively shut off flow for maintenance or system reconfiguration, offering greater control and safety compared to a standard check valve which only prevents reverse flow.
Q: Why is 316L stainless steel specified for the trim instead of standard 316?
A: 316L has a lower carbon content, which enhances its resistance to sensitization and intergranular corrosion during welding or in high-temperature service. This makes it particularly suitable for the harsh, chloride-rich seawater environment where such corrosion mechanisms can be accelerated.
Q: Is ductile iron suitable for full immersion in seawater?
A: While ductile iron offers good general corrosion resistance and high strength, for full immersion service, appropriate coatings or cathodic protection are often recommended in conjunction with the valve. The 316L trim provides the critical wetted-part corrosion resistance. Specific application details should be reviewed for optimal material selection.
Q: Can this valve be used in applications other than seawater?
A: Absolutely. While optimized for seawater, its corrosion-resistant construction makes it suitable for other aggressive fluids such as brackish water, certain chemical process streams, or wastewater where chlorides and other corrosive elements are present.
Q: What types of face-to-face dimensions do you follow?
A: Our valves are manufactured to standard face-to-face dimensions as per API 594 and ASME B16.10, ensuring easy replacement and installation in existing piping systems. Custom dimensions can be discussed based on project requirements.
Q: Do you offer actuated versions of this stop check valve?
A: Yes, we can provide this valve equipped with electric, pneumatic, or hydraulic actuators for remote or automated operation. Please specify your actuation requirements when inquiring.
Q: What is your lead time for standard sizes?
A: Lead times vary based on size, pressure class, and order quantity. Generally, for standard sizes and classes, we maintain competitive lead times. Our multiple shipment ports facilitate efficient logistics.
Q: Does the valve come with any documentation or testing certification?
A: As an ISO9001-certified manufacturer, we provide standard documentation including material certificates and a certificate of compliance. Additional testing such as hydrostatic shell tests can be performed and certified upon request.