Duplex Steel Gate Valve Manufacturer & Exporter

ASTM A995 4A / A182 F51 (UNS S31803 / 2205) · 2" to 36" (DN50–DN900) · Class 150 / 300 / 600 / 900 / 1500 · API 600 / API 603 / BS 1414. Exported to Saudi Arabia, UAE & 40+ countries with full documentation.

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Why Duplex Steel for Gate Valves?

Duplex Steel gate valves combine the gate valve's proven shutoff design with twice the yield strength of SS316 with far better chloride pitting and stress-corrosion resistance. This makes them the standard specification for seawater below 20°C, brackish water, brine, FGD systems, chemical processing, and offshore topside piping.

Supreme Valves manufactures duplex steel gate valves in ASTM A995 4A / A182 F51 (UNS S31803 / 2205) with design and testing per API 600 / API 603 / BS 1414. Every valve ships with EN 10204 3.1 material certificates and full pressure test reports; third-party inspection by Lloyd's, BV, or TÜV is available for project orders.

Duplex Steel Gate Valve Specifications

ParameterSpecification
Body MaterialsASTM A995 4A / A182 F51 (UNS S31803 / 2205)
Corrosion IndexPREN 34–35
Temperature Range-50°C to +250°C
Size Range2" to 36" (DN50–DN900)
Pressure ClassClass 150 / 300 / 600 / 900 / 1500
End ConnectionsFlanged RF/RTJ, Butt Weld
Design StandardAPI 600 / API 603 / BS 1414
TestingAPI 598, hydrostatic shell & seat; NDE (RT/PT/UT) on request
DocumentationEN 10204 3.1/3.2 MTC, NACE MR0175 compliance, IBR where applicable

Available Designs

Solid & Flexible Wedge
Bolted Bonnet, OS&Y Rising Stem
Pressure Seal Bonnet (Class 900+)
Full Port Through-Conduit
Bypass & Drain Options
Gear Operator / MOV Ready

Industries We Serve

Offshore oil & gas platforms
Desalination plants (GCC region)
Chemical & petrochemical plants
FGD & scrubber systems
Pulp & paper bleach plants
Marine & shipbuilding

Frequently Asked Questions

What duplex steel grades do you use for gate valves?
We manufacture Duplex Steel Gate Valve bodies in ASTM A995 4A / A182 F51 (UNS S31803 / 2205). All castings/forgings are supplied with EN 10204 3.1 material test certificates; 3.2 certification with Lloyd's, BV, or TÜV witness is available on request. PREN 34–35.
What services is a duplex steel gate valve recommended for?
Duplex Steel construction is proven in seawater below 20°C, brackish water, brine, FGD systems, chemical processing, and offshore topside piping. The material offers twice the yield strength of SS316 with far better chloride pitting and stress-corrosion resistance. Operating temperature range is -50°C to +250°C.
What sizes, ratings, and designs are available?
Sizes 2" to 36" (DN50–DN900), pressure classes Class 150 / 300 / 600 / 900 / 1500, end connections Flanged RF/RTJ, Butt Weld. Designs include: Solid & Flexible Wedge, Bolted Bonnet, OS&Y Rising Stem, Pressure Seal Bonnet (Class 900+), Full Port Through-Conduit. Design and testing per API 600 / API 603 / BS 1414, pressure tested per API 598.
Do you export duplex steel gate valves to the Middle East?
Yes. We export to Saudi Arabia, UAE, Qatar, Kuwait, Oman, and Bahrain with complete documentation — MTCs, test certificates, NACE MR0175 compliance where specified, and third-party inspection. Typical delivery 4–8 weeks with DAP/CIF terms to GCC ports.

Related Pages

Duplex Steel Valve Manufacturer (all types) → Duplex Steel Ball Valve → Duplex Steel Globe Valve → Duplex Steel Check Valve → Super Duplex Steel Gate Valve → Hastelloy C276 Gate Valve →

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