Industrial, marine, mining and oil & gas pipeline systems require valves capable of handling corrosive fluids, chloride-containing media and demanding pressure conditions. African Valve, an Duplex Valves Manufacturer in South Africa, provides duplex stainless steel valves designed for reliable isolation and flow control in severe-service applications. Duplex stainless steel combines austenitic and ferritic phases, providing a useful combination of high mechanical strength and corrosion resistance. Common valve grades include Duplex 2205 / UNS S31803 or S32205 / ASTM A182 F51 and Super Duplex 2507 / UNS S32750 / ASTM A182 F53.
Technical Specifications
Parameter | Specification |
Valve Type | Duplex Gate / Globe / Ball / Check / Butterfly / Plug Valve |
Material Grade | Duplex 2205 / Super Duplex 2507 |
Forged Material | ASTM A182 F51 / F53 / F55 |
Cast Material | ASTM A995 Grade 4A / 5A / 6A |
Application | Oil & Gas / Marine / Chemical / Mining / Water / Process Piping |
Size Range | Typically DN15 to DN600 or larger, depending on valve type |
Pressure Rating | Class 150 / 300 / 600 / 900 / 1500 / 2500 or PN-rated options |
End Connection | Flanged / Threaded / Socket Weld / Butt Weld |
Operation | Handwheel / Lever / Gear Operated / Pneumatic / Electric / Hydraulic |
Flow Direction | Bi-Directional or Uni-Directional, depending on valve design |
Testing | Pressure and Leakage Testing according to applicable standards |
Materials & Components
- Body: ASTM A182 F51 / F53 / F55 or ASTM A995 4A / 5A / 6A
- Bonnet: Duplex / Super Duplex
- Disc / Ball: Duplex / Super Duplex
- Stem / Shaft: Duplex / Super Duplex / Stainless Steel
- Seat: PTFE / RPTFE / Graphite / Metal
- Bearing: Stainless Steel / PTFE-Based Materials
- Gasket: Graphite / PTFE / Spiral Wound
- Packing: Graphite / PTFE
- Fasteners: Duplex / Super Duplex / Stainless Steel
- Trim: F51 / F53 / F55 / Compatible Alloy
Applications
- Oil & Gas – Onshore and offshore piping
- Mining – Mineral and slurry processing
- Chemical Processing – Corrosive fluid handling
- Desalination – Seawater systems
- Water Treatment – Water and utility pipelines
- Power Generation – Cooling-water systems
- Marine – Seawater and marine infrastructure
Testing & Standards
- Design Standards: ASME B16.34 and applicable valve-specific standards
- Valve Standards: API 600, API 602, API 594, API 609, API 6D, ISO 17292
- Testing: API 598, where applicable
- Flange & Dimensions: ASME B16.5, ASME B16.10 and ASME B16.25
Standard Duplex Valve Products
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