Super Duplex Steel Check Valve Manufacturer & Exporter

ASTM A995 5A / A182 F53 (UNS S32750 / 2507) · 2" to 36" (DN50–DN900) · Class 150 / 300 / 600 / 900 · BS 1868 / API 594 / API 6D. Exported to Saudi Arabia, UAE & 40+ countries with full documentation.

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Why Super Duplex Steel for Check Valves?

Super Duplex Steel check valves combine the check valve's proven shutoff design with PREN above 40 for warm seawater and high-chloride service where standard duplex pits. This makes them the standard specification for warm seawater, seawater injection, produced water, concentrated brines, and NORSOK-specified offshore systems.

Supreme Valves manufactures super duplex steel check valves in ASTM A995 5A / A182 F53 (UNS S32750 / 2507) with design and testing per BS 1868 / API 594 / API 6D. 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.

Super Duplex Steel Check Valve Specifications

ParameterSpecification
Body MaterialsASTM A995 5A / A182 F53 (UNS S32750 / 2507)
Corrosion IndexPREN 40–43
Temperature Range-50°C to +250°C
Size Range2" to 36" (DN50–DN900)
Pressure ClassClass 150 / 300 / 600 / 900
End ConnectionsFlanged RF/RTJ, Wafer, Lug, Butt Weld
Design StandardBS 1868 / API 594 / API 6D
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

Swing Check (Bolted Cover)
Dual Plate Wafer & Lug (API 594)
Piston / Lift Check
Non-Slam Spring Assisted
Retainerless Design Option
Soft or Metal Seated

Industries We Serve

Subsea & offshore production
Seawater injection systems
Desalination high-pressure trains
Produced water re-injection
Chlorinated cooling water
FPSO topside packages

Frequently Asked Questions

What super duplex steel grades do you use for check valves?
We manufacture Super Duplex Steel Check Valve bodies in ASTM A995 5A / A182 F53 (UNS S32750 / 2507). 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 40–43.
What services is a super duplex steel check valve recommended for?
Super Duplex Steel construction is proven in warm seawater, seawater injection, produced water, concentrated brines, and NORSOK-specified offshore systems. The material offers PREN above 40 for warm seawater and high-chloride service where standard duplex pits. 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, end connections Flanged RF/RTJ, Wafer, Lug, Butt Weld. Designs include: Swing Check (Bolted Cover), Dual Plate Wafer & Lug (API 594), Piston / Lift Check, Non-Slam Spring Assisted. Design and testing per BS 1868 / API 594 / API 6D, pressure tested per API 598.
Do you export super duplex steel check 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

Super Duplex Steel Valve Manufacturer (all types) → Super Duplex Steel Gate Valve → Super Duplex Steel Butterfly Valve → Duplex Steel Check Valve → Cryogenic Service Check Valve →

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