Duplex / Super Duplex Stainless Steel Ball Valves

Engineered for extreme corrosion resistance and strength, our Duplex and Super Duplex ball valves are built to perform in the toughest industrial and offshore environments.
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Key Features

Discover what makes our Duplex and Super Duplex ball valves the trusted choice for the most demanding corrosive and high-pressure environments.
1

Key Features

Higher chromium and molybdenum content gives outstanding resistance to chloride pitting and stress corrosion cracking.
2

Key Features

A duplex microstructure delivers roughly double the yield strength of standard austenitic stainless steel, allowing thinner, lighter valve bodies.
3

Key Features

Trusted in subsea, marine and chemical processing environments where standard stainless steel would fail prematurely.

The Valve Range

Typical Applications

Duplex and Super Duplex stainless steel ball valves are typically used in offshore oil and gas, marine and shipbuilding, chemical processing, petrochemical plants, desalination facilities, water treatment and power generation. Their high strength and excellent resistance to corrosion, pitting and stress-corrosion cracking make them well suited to harsh environments involving seawater, chlorides, aggressive chemicals and high pressures.

Common applications include seawater intake and cooling systems, offshore platforms, subsea pipelines, firewater systems, produced-water treatment, brine handling, chemical injection and high-pressure process lines. Super Duplex is generally selected for the most corrosive or chloride-rich duties, while Duplex provides a cost-effective option where strong corrosion resistance is required but service conditions are less severe.

Why Choose Ball Valve UK

Ball Valve UK offers expert support in selecting the right Super Duplex ball valve for your pressure, temperature, media and connection requirements. With experience across offshore, marine, chemical and high-pressure applications, we can help ensure the valve specification is suited to the conditions rather than supplying a generic option.

Our Super Duplex ball valves are available in a range of sizes, pressure ratings and configurations, with manual or actuated options available. Customers also benefit from reliable technical advice, complete valve and actuator packages, and UK-based support from initial enquiry through to delivery.

Duplex & Super Duplex Ball Valve Automation

Need an automated valve package? We can supply Duplex and Super Duplex ball valves fitted with pneumatic or electric actuators, along with suitable switchboxes, solenoid valves and control accessories. Each package can be selected, assembled and tested to suit your operating conditions and control requirements.
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Standards & Certification

We can supply Duplex and Super Duplex ball valves to meet a wide range of recognised industry standards, with options available for pressure testing, material certification and full traceability. Depending on your project requirements, documentation can include EN 10204 3.1 material certificates, pressure test reports and compliance with relevant standards such as ASME, API and PED.

If your application requires specific approvals, testing or certification, speak to the Ball Valve UK team. We can review your specification and help source the right valve, actuator package and supporting documentation for your project.

Delivery & Lead Times

Delivery times for Duplex and Super Duplex ball valves depend on the size, pressure rating, material grade, configuration and certification required. Standard specifications may be available sooner, while specialist or project-specific valves may require additional manufacturing, testing and documentation time.

Contact Ball Valve UK with your valve specification and required delivery date. Our team will review your requirements and provide current availability and an estimated lead time, without compromising on the correct valve selection or required documentation.

Frequently Asked Questions

Super Duplex contains higher levels of chromium, molybdenum and nitrogen than standard Duplex, giving it greater strength and corrosion resistance for the most demanding environments.

Yes, they are widely specified offshore due to their resistance to seawater corrosion and high mechanical strength.

Yes, their microstructure resists chloride-induced pitting and stress corrosion cracking, making them ideal for chloride-rich media.

Common options include flanged, threaded and butt-weld ends. Let us know your pipework specification and we can advise on the best fit.

Yes, full material test certificates and traceability documentation can be supplied with your order on request.

We stock a wide range of sizes, with larger or bespoke sizes available to order.

Yes, their corrosion resistance makes them well suited to many aggressive chemical processing applications.

Stock sizes are typically despatched quickly, while bespoke or larger valves may need a longer lead time. Contact us for a current estimate.

Yes, our team can help you select the right valve for your application. Call us on the number above.

Yes, these valves can be supplied manually operated or fitted with pneumatic or electric actuators.

They are commonly used in oil & gas, marine, desalination and chemical processing industries.

Our valves are available across a range of pressure classes to suit most pipeline requirements; contact us with your specification for confirmation.

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Duplex / Super Duplex Stainless Steel Ball Valves