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Home > Industrial Equipment & Components > Valve > Check Valve > Seawater Stop Check Valve With PN1.0MPa Pressure Rating And Flanged End Connection

Seawater Stop Check Valve With PN1.0MPa Pressure Rating And Flanged End Connection

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Product Spotlights

Dual-function seawater valve combining manual shut-off and automatic backflow prevention in one unit. Features corrosion-resistant alloys (Bronze/Duplex) for harsh marine environments, PN1.0MPa flanged connections for easy installation, and a robust design for low maintenance. Saves space and cost versus two separate valves, enhancing safety and reliability in shipbuilding, offshore, and desalination systems.

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

Key Specifications

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Product Type:

Stop Check Valve

Connection Type:

Flanged End

Pressure Rating:

PN1.0MPa

Contact Supplier Request Quote Chat Now

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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Product Type Stop Check Valve

Connection Type Flanged End

Pressure Rating PN1.0MPa

Application Medium Seawater, Marine Fluids

Body Material Corrosion-Resistant Alloy (e.g., Duplex, Bronze)

Seat Material Resilient or Metal

Operation Manual Stop & Automatic Check

Suitable Standards ISO, DIN, ANSI/ASME flanges

Installation Position Horizontal or Vertical (flow upward)

As a specialized manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. brings you a robust and reliable solution for critical marine and offshore piping systems: the Seawater Stop Check Valve with PN1.0MPa pressure rating and flanged end connection. Engineered to withstand the harsh, corrosive environment of seawater applications, this valve combines the crucial functions of a manual isolation valve and an automatic check valve into a single, space-saving unit. It is designed to provide secure backflow prevention while offering the operational flexibility to manually stop flow when required, making it an indispensable component for shipbuilding, offshore platforms, desalination plants, and coastal power stations. Our commitment to quality, evidenced by our annual export value of US$1-1.5 million to global markets, ensures you receive a product built for performance and longevity.

This valve is meticulously crafted to address the unique challenges of handling seawater and other corrosive media. Its design prioritizes durability, ease of maintenance, and operational safety in demanding marine environments.

Key Features & Technical Advantages:

Dual-Function Design: Integrates a manual stop valve (globe or gate type mechanism) with an automatic check valve. The handwheel allows positive shut-off for maintenance or system isolation, while the internal swing or lift check mechanism automatically prevents reverse flow upon flow cessation.

Superior Corrosion Resistance: Constructed from materials specifically selected for seawater service. Common body materials include:

Material Option	Key Characteristics	Typical Applications
Bronze (Naval Brass)	Excellent resistance to seawater corrosion and biofouling.	General seawater lines, ballast systems.
Duplex/Super Duplex Stainless Steel	High strength and exceptional resistance to pitting and crevice corrosion.	High-pressure seawater systems, offshore oil & gas.
Cast Iron with Epoxy Coating	Cost-effective with a protective internal/external coating.	Cooling water systems, less critical services.

Flanged End Connection (PN1.0MPa): Features standard flanges (e.g., ISO, DIN, ANSI/ASME) rated for PN10 (1.0MPa), ensuring a leak-proof, bolted connection that is easy to install, inspect, and maintain compared to welded ends. The flanges facilitate a secure interface with existing piping.
Robust Pressure Containment: The PN1.0MPa (10 bar) pressure rating signifies its suitability for a wide range of marine and industrial seawater systems, providing a significant safety margin against pressure surges.
Reliable Sealing: Utilizes resilient seals (like EPDM, NBR) or metal-to-metal seats (for high temperatures) to ensure tight shut-off in both the manual stop and automatic check functions, minimizing internal leakage.
Low Maintenance Design: The flanged body often allows for in-line maintenance. The internals (disc, hinge, seat) can be accessible without removing the entire valve from the pipeline, reducing downtime and maintenance costs.
Versatile Installation: Can be installed in both horizontal and vertical pipelines (with flow direction upward). Clear flow direction marking is provided on the body for correct installation.

Benefits for Your Operations:

Enhanced System Safety: Prevents backflow which can damage pumps, cause contamination, or disrupt processes. The manual stop feature adds a layer of operational control.
Space and Cost Efficiency: Replaces the need for two separate valves (a stop valve and a check valve), saving valuable space on ships or platforms and reducing overall installation costs.
Extended Service Life: Corrosion-resistant materials and robust construction minimize degradation from saltwater, leading to lower lifetime costs and fewer replacements.
Reduced Risk of Failure: The dedicated design for seawater service lowers the risk of unexpected valve failure due to corrosion or scaling, ensuring system reliability.
Global Compliance: Manufactured to meet international standards for marine valves, facilitating use in projects worldwide.

With a proven track record since 2016 and exports reaching North America, Europe, Southeast Asia, Africa, and other key global markets, Shanghai Zhibang Valve has established itself as a trusted partner for industrial valve solutions. Our ISO9001 certified manufacturing process guarantees consistent quality and performance in every Seawater Stop Check Valve we produce. Sourced directly from the manufacturer and shipped efficiently from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, you benefit from competitive pricing, reliable supply, and technical support. Choose this valve to safeguard your marine piping systems with a component designed for durability, functionality, and peace of mind. Contact us today for a quotation or to discuss your specific application requirements.

Frequently Asked Questions (FAQ):

Q: What is the primary advantage of a stop check valve over a standard check valve?
A: The key advantage is control. A standard check valve only prevents backflow automatically. A stop check valve adds a manual handwheel or stem that allows an operator to positively hold the check mechanism closed ("stop") even if forward flow is present, enabling isolation for maintenance or system control.
Q: Can this valve be used with media other than seawater?
A: Yes, absolutely. While optimized for seawater's corrosiveness, it is suitable for various other corrosive or aggressive fluids in industrial settings, such as brackish water, certain chemicals, or wastewater, provided the material compatibility is verified.
Q: What flange standards do you offer?
A: We commonly produce valves with ISO, DIN, ANSI/ASME, or JIS standard flanges to match global piping specifications. The specific standard and flange facing (e.g., RF, FF) can be specified at the time of ordering.
Q: Is the PN1.0MPa rating sufficient for high-pressure seawater pumps?
A: PN1.0MPa (approx. 145 PSI) is suitable for many marine cooling, ballast, and general service systems. For higher-pressure applications (e.g., reverse osmosis feed), valves with higher pressure ratings (PN1.6MPa, PN2.5MPa) are available upon request.
Q: How do I determine the correct material (Bronze vs. Duplex Stainless Steel) for my application?
A: Material selection depends on water chemistry, temperature, pressure, and budget. Bronze is excellent for standard seawater. Duplex stainless steel is recommended for higher chloride content, higher pressures/temperatures, or where superior strength is needed. Our technical team can assist you.
Q: What is the typical lead time for an order?
A: Lead times vary based on order quantity and material specifications. For standard configurations, we often have stock or can produce within a few weeks. We provide accurate lead time estimates with every quotation.
Q: Do you provide testing certificates for these valves?
A> Yes, as an ISO9001 certified manufacturer, we can provide standard factory test reports (e.g., shell test, seat test). Additional certified documentation like 3.1 material certificates is available upon request.
Q: Can the valve be repaired in-place if it starts leaking?
A: The flanged design and often modular internals facilitate in-line maintenance. In many cases, the bonnet can be removed with the valve under pressure to inspect or replace internal components like the disc or seals, minimizing system downtime.