Super duplex needle valves are very accurately constructed instrumentation valves that are used for precise flow control, throttling, and leak-proof isolation in process systems that require extreme conditions. They are made of UNS S32750 (2507) and UNS S32760 (Zeron 100) stainless steel, providing good mechanical properties and highly resistant to chloride pitting, crevice corrosion, and stress corrosion cracking. They have very durable construction that makes them suitable for use in marine, subsea, and highly chloridic applications when traditional stainless steel grades can be affected by corrosion. Aashish Metals is a manufacturer and supplier of super duplex needle valves in India.
Technical data
Specifications of Super Duplex Steel Needle Valves
| Parameter | Specification Detail |
|---|---|
| Body & Stem Material | Super Duplex UNS S32750 (2507 / EN 1.4410), UNS S32760 (EN 1.4501) |
| Size Range | 1/8" to 2" (DN 6 to DN 50); Orifice: 2.0 mm to 9.5 mm |
| Working Pressure | Up to 6000 psig (414 bar) @ 38°C (100°F) |
| Temperature Limit | -50°C to 300°C (graphite packing); PTFE packing to 200°C |
| End Connections | Female NPT, Male NPT, BSPP, BSPT, Twin Ferrule Tube Ends, Socket Weld |
| Valve Patterns | Straight Pattern, Angle Pattern, Panel Mount, Union Bonnet, 3-Way |
| Stem & Tip Design | Non-rotating self-centering regulating tip / blunt shut-off tip |
| Packing Materials | PTFE (Standard), Grafoil / Graphite (High Temp), Viton Seals |
| Handle Options | Stainless Steel T-bar handle, phenolic knob, lockable handwheel |
| Testing & Quality | 100% Factory Hydrostatic & Pneumatic Shell/Seat Test, PMI |
Chemical Compositions of Super Duplex Steel Needle Valves
| Element | S32750 (2507 / EN 1.4410) | S32760 (EN 1.4501) |
|---|---|---|
| Carbon (C) | 0.030 max | 0.030 max |
| Manganese (Mn) | 1.20 max | 1.00 max |
| Silicon (Si) | 0.80 max | 1.00 max |
| Phosphorus (P) | 0.035 max | 0.030 max |
| Sulfur (S) | 0.020 max | 0.010 max |
| Chromium (Cr) | 24.0 – 26.0 | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 5.0 | 3.0 – 4.0 |
| Nitrogen (N) | 0.24 – 0.32 | 0.20 – 0.30 |
| Copper (Cu) | 0.50 max | 0.50 – 1.00 |
| Tungsten (W) | Not Specified | 0.50 – 1.00 |
| Iron (Fe) | Balance | Balance |
Super Duplex Steel Needle Valves Mechanical Properties
| Mechanical Property | UNS S32750 (F53 / 1.4410) | UNS S32760 (F55 / 1.4501) |
|---|---|---|
| Tensile Strength, Min. | 795 MPa (116 ksi) | 750 MPa (109 ksi) |
| Yield Strength (0.2% offset), Min. | 550 MPa (80 ksi) | 550 MPa (80 ksi) |
| Elongation (in 2 inches / 50mm), Min. | 15% | 25% |
| Hardness, Max. | 310 HBW (32 HRC) | 310 HBW (32 HRC) |
| Density | 7.8 g/cm³ | 7.8 g/cm³ |
| Equivalent Specifications | ASTM A182 F53, ASTM A276/A479 S32750 | ASTM A182 F55, ASTM A276/A479 S32760 |
Dimensions of 2507 Super Duplex Steel Needle Valves
| Valve Size | Bore Width b (mm) | Length L (mm) | Port Offset a (mm) | Handle W (mm) | Height H (mm) |
|---|---|---|---|---|---|
| 1/8 inch | 28 | 56 | 28 | 60 | 80 |
| 1/4 inch | 28 | 56 | 28 | 60 | 80 |
| 3/8 inch | 28 | 56 | 28 | 60 | 80 |
| 1/2 inch | 28 | 58 | 28 | 60 | 81 |
| 3/4 inch | 35 | 62 | 35 | 60 | 85 |
| 1 inch | 45 | 70 | 45 | 70 | 100 |
Pressure Rating of Super Duplex Steel Needle Valves
| Operating Temp (°C / °F) | Max Working Pressure (UNS S32750 / S32760) | PTFE Packing Limit | Graphite Packing Limit |
|---|---|---|---|
| -50°C to 38°C (-58°F to 100°F) | 6000 psig (414 bar) | Fully Suitable | Fully Suitable |
| 100°C (212°F) | 5510 psig (380 bar) | Fully Suitable | Fully Suitable |
| 150°C (302°F) | 5070 psig (350 bar) | Fully Suitable | Fully Suitable |
| 200°C (392°F) | 4640 psig (320 bar) | Max limit for standard PTFE | Fully Suitable |
| 250°C (482°F) | 4350 psig (300 bar) | Requires Grafoil / PEEK | Fully Suitable |
| 300°C (572°F) | 4120 psig (284 bar) | Exceeded | Max Code Safe Limit |
Types of Duplex Steel Instrumentation Ball Valves
Applications and Industrial Uses of Super Duplex Steel Needle Valves
- Subsea Wellhead Control Panels
- Offshore Oil and Gas Sampling Systems
- Seawater Desalination Plant Analyzer Lines
- High-Chloride Chemical Injection Skids
- Marine Hydraulic Control Systems
- Refinery Process Gas Sampling Lines
- Offshore Pressure Gauge Isolation Systems
- Subsea Chemical Dosing and Metering Lines
Frequently Asked Questions
A small-bore valve with a tapered stem for precise flow control and shut-off. Made from UNS S32750 or S32760, it offers high strength and excellent chloride corrosion resistance.
S32750 (2507) has the higher nitrogen limit (0.24 to 0.32%), while S32760 adds copper and tungsten (0.50 to 1.00% each) for extra resistance in acidic chloride service
Yes, in severe chloride environments. Super duplex offers higher strength and better resistance to pitting and crevice corrosion than 2205.
Depending on size, packing, and temperature, small-bore needle valves can handle pressures up to 6000 psig (414 bar).
Super duplex generally supports temperatures up to 300°C to 315°C. Actual limits depend on packing material and operating conditions.
Yes, provided they comply with NACE MR0175 / ISO 15156 requirements for hardness, temperature, and sour service conditions.
Common options include NPT, BSPP, BSPT, and tube compression connections. Socket weld and other ends may be available on request.
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