Duplex Steel Needle Valves Manufacturer and Supplier in India
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Duplex steel needle valves are precision-engineered instrumentation valves for accurate flow control, throttling and leak-tight isolation in high-pressure systems. These valves are made from dual-certified 2205 duplex stainless steel (UNS S31803 / S32205) and resist pitting. They are highly strong and resist pitting, crevice corrosion, and stress corrosion cracking. Sizes run from 1/8″ to 1″ (up to 2″ on request). The pressure rating of the valves goes up to 6000 psig (414 bar). The valves are available in NPT, BSPP, BSPT, twin ferrule compression, and socket weld fittings. Aashish Metals produces and sells these valves in India that carry EN 10204 3.1 certification, PMI and hydrostatic testing.
Technical data
Specifications of Duplex Steel Needle Valves
| Parameter Category | Technical Specifications & Options |
|---|---|
| Brand Name | Aashish Metals |
| Primary Material | Duplex 2205 (UNS S31803 / S32205 / EN 1.4462) |
| Body Construction | Barstock, Forged Body |
| Body Shapes | Square, Round, Hexagon |
| Valve Sizes | 1/8" to 1" (6 mm to 25 mm) |
| Orifice Sizes | 3.2 mm to 11.5 mm |
| Pressure Ratings | Up to 6000 psig (414 bar) for 1/8" to 1/2", up to 5000 psig (345 bar) for 3/4" to 1" |
| Media Temperature Range | -50°C to 315°C (packing dependent: PTFE 200°C, graphite 315°C) |
| Flow Patterns | Straight Pattern, Angle Pattern, Cross Pattern |
| Valve Functions | 2-Way (Isolation), 3-Way (Diverting/Switching) |
| End Connections | Threaded, Tube End (Compression), Socket Weld (SW), Butt Weld (BW), Flange End |
| Thread Standards | NPT, BSPP, BSPT, JIC, Metric, UNF |
| Handle Types | Bar T-Handle, Knob Handle, Wheel Handle |
| Applicable Media | Hydraulic Oil, Air, Water, Gas, Steam (with graphite packing only), Hot Water, Cold Water, Seawater, Chemicals |
| Compatibility | Dimensionally compatible with common instrumentation fittings on request |
| Packaging Details | Box Packing, Wooden Pallet Packaging |
Chemical Compositions of Duplex Steel Needle Valves
| Element | UNS S31803 (Standard Duplex) | UNS S32205 / Duplex 2205 (Tighter Spec) |
|---|---|---|
| Nickel (Ni) | 4.50 – 6.50 | 4.50 – 6.50 |
| Carbon (C) | 0.030 max | 0.030 max |
| Manganese (Mn) | 2.00 max | 2.00 max |
| Phosphorus (P) | 0.030 max | 0.030 max |
| Sulfur (S) | 0.020 max | 0.020 max |
| Silicon (Si) | 1.00 max | 1.00 max |
| Chromium (Cr) | 21.0 – 23.0 | 22.0 – 23.0 |
| Molybdenum (Mo) | 2.50 – 3.50 | 3.00 – 3.50 |
| Nitrogen (N) | 0.08 – 0.20 | 0.14 – 0.20 |
| Iron (Fe) | Balance | Balance |
Duplex Steel Needle Valves Mechanical Properties
| Grade / Material | Yield Strength 0.2% Offset (MPa, min.) | Ultimate Tensile Strength (MPa, min.) | Elongation (% in 2 in., min.) | Hardness (HBW, max.) |
|---|---|---|---|---|
| UNS S31803 | 450 | 620 | 25 | 290 / 293 |
| UNS S32205 / 2205 | 450 | 655 | 25 | 290 / 293 |
Equivalent Grades of Duplex Steel Needle Valves
| Common Name | Werkstoff Nr. (EN Standard) | UNS Number | Dual Certification |
|---|---|---|---|
| Duplex 2205 | 1.4462 (X2CrNiMoN22-5-3) | UNS S31803 / UNS S32205 | ASTM A276 / A479 (Bar), ASTM A182 F51 / F60 (Forgings) |
Dimensions Chart of Duplex Steel Needle Valves
| Nominal Size | Orifice Dia. (mm) | Face-to-Face L (mm) | Open Height H (mm) | Handle Length W (mm) | Flow Coeff. (Cv) | Weight (kg) |
|---|---|---|---|---|---|---|
| 1/8" NPT (3.18 mm) | 3.2 | 52.0 | 68.0 | 45.0 | 0.20 | 0.35 |
| 1/4" NPT (6.35 mm) | 4.8 | 58.0 | 75.0 | 55.0 | 0.40 | 0.45 |
| 3/8" NPT (9.52 mm) | 6.4 | 64.0 | 82.0 | 55.0 | 0.65 | 0.58 |
| 1/2" NPT (12.7 mm) | 8.0 | 72.0 | 95.0 | 70.0 | 0.95 | 0.85 |
| 3/4" NPT (19.05 mm) | 10.0 | 86.0 | 110.0 | 90.0 | 1.40 | 1.35 |
| 1" NPT (25.4 mm) | 11.5 | 98.0 | 125.0 | 100.0 | 2.10 | 1.95 |
Working Pressure and Temperature Rating of Duplex Steel Needle Valves
| Valve Size | Stem Packing Material | Working Pressure @ -29°C to 38°C (-20°F to 100°F) | Working Pressure @ 150°C (302°F) | Working Pressure @ Max. Rated Temp. | Max. Temperature Limit |
|---|---|---|---|---|---|
| 1/8" to 1/2" | Flexible Graphite | 6000 psig (414 bar) | 5100 psig (351 bar) | 4200 psig (289 bar) | 315°C (600°F) |
| 1/8" to 1/2" | Virgin PTFE | 6000 psig (414 bar) | 3200 psig (220 bar) | 0 psig (0 bar) | 200°C (392°F) |
| 3/4" to 1" | Flexible Graphite | 5000 psig (345 bar) | 4200 psig (289 bar) | 3500 psig (241 bar) | 315°C (600°F) |
| 3/4" to 1" | Virgin PTFE | 5000 psig (345 bar) | 2800 psig (193 bar) | 0 psig (0 bar) | 200°C (392°F) |
Types of Duplex Steel Instrumentation Ball Valves
Applications and Industrial Uses of Duplex Steel Needle Valves
- Offshore Wellhead Instrumentation Panels
- Oil and Gas Pressure Gauge Isolation Lines
- Seawater Reverse Osmosis (SWRO) Sampling Systems
- Chloride Chemical Dosing and Injection Skids
- Refinery Process Analyzer Sample Conditioning Systems
- Desalination Plant Pressure Transmitter Impulse Lines
- Marine Fuel and Hydraulic Control Circuits
- Power Plant Boiler Water Sampling Lines
Frequently Asked Questions
A small-bore valve with a tapered stem for precise flow regulation and shut-off. Made from 2205 duplex stainless steel (UNS S31803/S32205), it offers high strength and excellent chloride corrosion resistance.
Both are 2205 duplex grades. S32205 has tighter chemical composition limits, providing more consistent corrosion resistance. Modern production often dual-certifies both grades.
Choose a needle valve for precise flow control and throttling. Choose a ball valve for quick on/off isolation and minimal pressure drop.
Depending on size, packing, and temperature, heavy-wall duplex needle valves can handle pressures up to 6000 psig (414 bar).
Duplex 2205 is normally used up to about 300°C; graphite packing allows 315°C and PTFE packing 200°C.
Yes, provided they comply with NACE MR0175 / ISO 15156 requirements for hardness, heat treatment, and sour service conditions.
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