Duplex Stainless Steel A995 4A Flanged Globe Valve - 150LB, API, BS 1873
Tengs Valve supplies high-quality Duplex Stainless Steel A995 4A Flanged Globe Valves for ANSI Class 150LB, manufactured to API, ANSI, and BS 1873 standards. These globe valves feature straight body, rising stem, OS&Y, bolted bonnet design with plug or parabolic disc. Available in duplex stainless steel (A995-4A, A995-5A, A890-4A, A890-5A) with flanged (RF, FF) ends. Sizes range from 2″ to 24″ (DN50 to DN600). Operated by handwheel, bevel gear, or bare stem. Ideal for chemical, petrochemical, offshore, and seawater applications requiring high strength and excellent corrosion resistance.
4A Flanged Globe Valve Specifications
• Design Standards: ANSI B16.34, BS 1873
• Type of Valve: Globe Valve, Stop Valve
• Body Structure: Straight Type
• End Connections: Flanged, Raised Face (RF), Flat Face (FF)
• Disc Type: Plug Disc or Parabolic Disc
• Bonnet Type: Bolted Bonnet (B.B.)
• Stem Type: Rising Stem (RS)
• Body Materials: Duplex Stainless Steel: A995-4A, A995-5A, A890-4A, A890-5A
• Trim Materials: Stainless Steel F51, F53
• Drive Type: Handwheel, Bevel Gear, Bare Stem
• Pressure Rating: 150LB, PN20
• Size Range: 2″ to 24″ (DN50 to DN600)
• Sour Service: NACE MR 0175
✓ Duplex 2205 (A995 4A) provides superior resistance to chloride stress corrosion cracking and pitting compared to standard 304/316 stainless steels
A995 4A vs A995 5A: Duplex Stainless Steel Grade Comparison
| Grade | UNS / Wrought Equivalent | PREN | Tensile Strength | Typical Application |
|---|---|---|---|---|
| A995 4A (CD3MN) | J92205 / S32205 (2205) | ~35 | ≥ 620 MPa | Chemical processing, seawater desalination, shipbuilding, general duplex service |
| A995 5A (CD3MWCuN) | J93404 / S32760 (2507) | > 40 | ≥ 690 MPa | Offshore oil & gas, subsea, aggressive chemical environments requiring superior corrosion resistance |
Reference: ASTM A995. PREN (Pitting Resistance Equivalent Number) = Cr% + 3.3×Mo% + 16×N%. Higher PREN indicates better corrosion resistance. Grade 5A is specified when 4A is insufficient for the service environment.
Globe Valve Standards
• Design and Manufacture: BS 1873, ASME B16.34
• Inspection and Test: API 598
• End Flange Dimension: ASME B16.5
• BW End Dimension: ASME B16.25
• Face to Face / End to End: ASME B16.10
• Pressure-Temperature Ratings: ASME B16.34
4A Globe Valve Main Parts and Material List
| No. | Parts Name | Material (A890/A995 4A / F51) |
|---|---|---|
| 1 | Body | ASTM A890/A995 4A |
| 2 | Seat Ring | ASTM A890/A995 4A |
| 3 | Disc | ASTM A890/A995 4A |
| 4 | Stem | ASTM A182 F51 |
| 5 | Disc Nut | ASTM A351 CF8M |
| 6 | Bonnet Nut | ASTM A194 8M |
| 7 | Bonnet Bolt | ASTM A193 B8M |
| 8 | Gasket | 316SS + Graphite |
| 9 | Backseat Bushing | ASTM A890/A995 4A |
| 10 | Bonnet | ASTM A995 4A |
| 11 | Packing | Graphite |
| 12 | Eyebolt Pin | 316SS |
| 13 | Gland Eyebolt | ASTM A193 B8M |
| 14 | Gland | ASTM A182 F51 |
| 15 | Gland Flange | ASTM A995 4A |
| 16 | Eyebolt Nut | ASTM A194 8M |
| 17 | Stem Nut | ASTM A439 D2 |
| 18 | Handwheel | Ductile Iron |
| 19 | Handwheel Nut | Carbon Steel |
Reference: BS 1873, ASME B16.34. Materials may vary by model and pressure rating. Contact us for confirmed material certificate.
Main Dimensions of DSS 4A Globe Valve 150LB
| Class | Size | Dimensions (mm) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NPS | DN | L | B | D | G | f | K | Z-Φd | C | A | ||
| RF | BW | |||||||||||
| 150Lb | 2 | 50 | 203 | 203 | 51 | 152 | 91.9 | 1.6 | 120.7 | 4-19.1 | 15.8 | 63 |
| 2 1/2 | 65 | 216 | 216 | 64 | 178 | 104.6 | 1.6 | 139.7 | 4-19.1 | 17.5 | 75 | |
| 3 | 80 | 241 | 241 | 76 | 191 | 127 | 1.6 | 152.4 | 4-19.1 | 19.1 | 91 | |
| 4 | 100 | 292 | 292 | 102 | 229 | 157.2 | 1.6 | 190.5 | 8-19.1 | 23.9 | 117 | |
| 6 | 150 | 406 | 406 | 152 | 279 | 215.9 | 1.6 | 241.3 | 8-22.2 | 25.4 | 172 | |
| 8 | 200 | 495 | 495 | 203 | 343 | 269.7 | 1.6 | 298.5 | 8-22.2 | 28.4 | 223 | |
| 10 | 250 | 622 | 622 | 254 | 406 | 323.9 | 1.6 | 362 | 12-25.4 | 30.2 | 278 | |
| 12 | 300 | 699 | 699 | 305 | 483 | 381 | 1.6 | 431.8 | 12-25.4 | 31.8 | 329 | |
| 14 | 350 | 787 | 787 | 337 | 533 | 412.8 | 1.6 | 476.2 | 12-28.6 | 35.1 | 362 | |
| 16 | 400 | 914 | 914 | 387 | 597 | 469.9 | 1.6 | 539.8 | 16-28.6 | 36.6 | 413 | |
| 18 | 450 | 978 | 978 | 436 | 635 | 533.4 | 1.6 | 577.9 | 16-31.8 | 39.6 | 464 | |
Reference: ASME B16.10, ASME B16.5. Dimensions may vary by manufacturer. Contact us for confirmed drawing and quotation.
Typical Applications of Duplex Stainless Steel A995 4A Globe Valve
• Seawater desalination: duplex 2205 resists chloride pitting and crevice corrosion in high-chloride seawater environments.
• Offshore and marine: shipbuilding, subsea manifolds, and offshore platforms requiring high strength and corrosion resistance.
• Chemical processing: aggressive chemical media where standard 304/316 stainless steels are inadequate.
• Petrochemical and oil & gas: process lines handling corrosive fluids and sour service with NACE MR 0175 compliance.
• Pulp and paper processing: chlorine dioxide and bleach plant service requiring superior corrosion resistance.
• Desalination and water treatment: brine handling, reverse osmosis, and chemical dosing systems.
FAQ - Duplex Stainless Steel A995 4A Globe Valve 150LB
Q1: What is A995 4A duplex stainless steel?
A: A995 4A (also known as A890 4A, CD3MN, or UNS J92205) is a cast duplex stainless steel with a ferritic-austenitic microstructure. It is the cast equivalent of wrought 2205 / S32205 duplex stainless steel, offering high strength (≥ 620 MPa tensile) and excellent resistance to chloride stress corrosion cracking and pitting corrosion. Its PREN is approximately 35.
Q2: What is the difference between A995 4A and A995 5A?
A: A995 4A (2205 duplex) has a PREN of approximately 35 and is suitable for general duplex service including seawater and chemical processing. A995 5A (2507 super duplex) has a PREN greater than 40, offering superior corrosion resistance and higher strength (≥ 690 MPa tensile). Grade 5A is specified for offshore oil & gas, subsea, and aggressive chemical environments where 4A is insufficient.
Q3: What is the difference between duplex and standard 316 stainless steel?
A: Duplex stainless steel (A995 4A) has a ferritic-austenitic microstructure that provides approximately twice the yield strength of 316 stainless steel, along with superior resistance to chloride stress corrosion cracking and pitting corrosion. Standard 316 (CF8M) is suitable for general corrosive service, while duplex 2205 is preferred for seawater, high-chloride, and high-strength applications.
Q4: What are the pressure rating and size range?
A: This A995 4A globe valve is rated ANSI Class 150LB (PN20), with sizes from 2″ to 24″ (DN50 to DN600). Other pressure ratings and sizes are available on request.
Q5: What is BS 1873 standard?
A: BS 1873 is a British Standard for "Specification for steel globe and globe stop and check valves (flanged and butt-welding ends) for the petroleum, petrochemical, and allied industries." It specifies requirements for cast or forged carbon and alloy steel outside screw and yoke globe valves, straight pattern, angle pattern, and Y pattern, in sizes DN15 to DN400 (½″ to 16″) and Classes 150 to 2500.
Q6: What actuation options and special designs are available?
A: Actuation options include manual handwheel, bevel gear, and bare stem for electric actuator. Special designs include NACE MR 0175 compliance for sour service. Other options are available on request.
Get a Fast Quote for A995 4A Duplex Globe Valve
Send us your size, pressure rating, material grade (4A / 5A), end connection, actuation type, and quantity. Our team will reply within 24 hours with price, drawing, and delivery time.
Email: sales@tengsvalve.com
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