Super Duplex Valve Manufacturer in Europe

ValvesOnly Europe manufactures and supplies Super Duplex valves for high-pressure and corrosive applications involving seawater, chlorides, and sour service. Manufactured in UNS S32750 and UNS S32760 grades, our range includes ball, gate, globe, butterfly, check, knife gate, and pressure reducing valves for offshore, marine, desalination, chemical processing, and oil & gas industries.

What is a Super Duplex Valve?

Super Duplex valve is an alloy of two phase stainless steel, which means it is a combination of austenitic and ferritic stainless steel with high content of chromium, molybdenum, and nitrogen. The two phase nature of stainless steel enables it to combine strength and resistance to corrosion properties that cannot be achieved by single phase stainless steel. It is for this reason that Super Duplex valves are suitable for applications such as sea water injection and sour service due to the high chloride environments.

Types of Super Duplex Valve:

• Super Duplex Ball Valve – A quarter turn valve with a spherical bore, built for tight shut off and minimal pressure loss.
• Super Duplex Globe Valve – A linear valve that uses a disc and seat arrangement to regulate flow.
• Super Duplex Butterfly Valve – A rotary disc valve, compact and lightweight, suited to large diameter lines.
• Super Duplex Check Valve – A non return valve that stops backflow and protects pumps and other equipment downstream.
• Super Duplex Gate Valve – A linear motion valve made for full on/off isolation with barely any pressure drop.
• Super Duplex Knife Gate Valve – A gate valve with a sharp edged blade, built to cut through slurries, fibrous material, and viscous fluids.
• Super Duplex Pressure Reducing Valve – A control valve that brings downstream pressure down and holds it steady.

Pressure and Temperature Ratings:

• Pressure Classes: ASME Class 150 to Class 2500
• Pressure Rating: PN 10 to PN 420
• Operating Temperature Range: -50°C to +260°C, depending on grade and design
• Sizes: DN 15 (½”) to DN 1200 (48″)

Design and Manufacturing Standards:

• Design: API 6D, API 600, API 602, BS EN 12516, ASME B16.34
• Face-to-Face: ASME B16.10, EN 558
• Flange Dimensions: ASME B16.5, EN 1092-1
• Testing: API 598, EN 12266
• Fire Safe Design: API 607 / API 6FA
• Certification: EN 10204 3.1 / 3.2, PED 2014/68/EU, NACE MR0175 / MR0103

Material Grades:

Mechanical Properties:

Benefits of Super Duplex Valve:

Once installed, these valves tend to earn their keep over the long run rather than the short one:

• Longer service life in seawater and high chloride streams
• Thinner walls and lighter valve bodies for the same pressure rating
• Standing up to pitting, crevice corrosion, and stress corrosion cracking
• Holding up in sour gas and high H2S conditions
• Fewer maintenance stops and less downtime offshore and at sea
• Working across subsea, topside, and onshore setups alike
• Full material traceability, backed by recognized certification bodies
• A wide operating window across pressure classes and temperature extremes

Industries and Applications:

• Offshore oil and gas platforms
• Subsea production systems
• Seawater injection and firewater systems
• Desalination plants
• Chemical and petrochemical processing
• Marine shipbuilding and shipboard piping
• Pulp and paper bleaching lines
• Flue gas desulfurization systems

Why Choose Super Duplex Valve?

• Stands up to pitting and crevice corrosion in seawater, brine, and chloride heavy media
• Yield strength roughly double that of ordinary austenitic stainless steel
• Resistance to chloride stress corrosion cracking at elevated temperatures
• Compliant with NACE MR0175 / MR0103 sour service and H2S service requirements
• Helps to increase maintenance cycles in seawater injection, desalination, and offshore applications
• Better strength to weight ratio means thinner walls and lighter valves, without giving up performance