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Duplex Valve

Duplex Valve

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Duplex Valve Manufacturer in USA


Duplex and Super Duplex stainless steel valves are engineered for services where standard austenitic grades fall short of high chloride content, elevated pressure temperature ratings, and aggressive corrosive media. As a manufacturer of Duplex Valves in USA, we manufacture valves in Duplex and Super Duplex grades conforming to ASME, API & ISO standards, providing gate valves, globe valves, check valves, ball valves, butterfly valves and plug valves in tough process applications.

What is a Duplex Valve?

A Duplex valve refers to a valve made of a Duplex stainless steel alloy. Duplex stainless steel consists of two phases, austenite and ferrite in equal proportions. The two phase nature of this alloy provides strength and resistance to corrosion that cannot be provided by the single phase stainless steel (austenitic) such as 304 or 316.

Ferrite phase in Duplex steel usually varies between 35% and 65%, which makes Duplex steel alloys twice as strong as regular austenitic stainless steel.

Duplex Grades We Manufacture:

Grade

UNS Designation

PREN (approx.)

Common Form

Duplex 2205

S31803 / S32205

32-36

Casting (CD4MCu variant), Forging, Plate

Super Duplex 2507

S32750

38-42

Casting (CD3MWCuN), Forging, Bar

Super Duplex 2507 (Alt.)

S32760

40-42

Casting, Forging

Lean Duplex

S32101 / S32304

22-26

Casting, Forging

PREN (Pitting Resistance Equivalent Number) is calculated using %Cr + 3.3(%Mo) + 16(%N), and is used to rank alloy performance in chloride-bearing service.

Mechanical & Chemical Properties:

Typical Mechanical Properties for Duplex 2205 & Super Duplex 2507:

  • Yield Strength: 65,000-80,000 psi (450-550 MPa)

  • Tensile Strength: 90,000-116,000 psi (620-800 MPa)

  • Elongation: 25% minimum

  • Hardness: 28-32 HRC (max)

  • Impact Toughness: Retained down to –40°F / –50°C

Typical Chemical Composition (weight %):

Element

Duplex 2205

Super Duplex 2507

Chromium (Cr)

21-23

24-26

Nickel (Ni)

4.5-6.5

6-8

Molybdenum (Mo)

2.5-3.5

3-5

Nitrogen (N)

0.08-0.20

0.24-0.32

Carbon (C)

0.03 max

0.03 max

Valve Types Manufactured:

  • Gate Valves - wedge/parallel slide, OS&Y and NRS, rising and non-rising stem

  • Globe Valves - straight pattern, angle pattern, Y-pattern

  • Check Valves - swing, lift, dual plate/wafer, piston

  • Ball Valves - floating, trunnion mounted, full port and reduced port

  • Butterfly Valves - wafer, lug, double flanged, high performance offset disc

  • Plug Valves - lubricated and non lubricated, sleeved

  • Needle & Instrumentation Valves - for sampling and control lines

Design & Manufacturing Standards:

  • Design/Manufacturing: ASME B16.34, API 600, API 602, API 603, API 6D, BS 1873, BS 5352

  • Face to Face Dimensions: ASME B16.10

  • Flange Ends: ASME B16.5, ASME B16.47 (Series A/B)

  • Butt Weld Ends: ASME B16.25

  • Pressure Testing: API 598, API 6D

  • Fire Safe Testing: API 607 / API 6FA

  • Material Testing: ASTM A890/A890M (castings), ASTM A182/A479 (forgings/bars)

  • NDE: Radiography (ASTM E94/E1032), Liquid Penetrant (ASTM E165), Ultrasonic (ASTM A609), Magnetic Particle (ASTM A275)

  • Ferrite Content Verification: ASTM A923 (Method A/B/C) to confirm phase balance and detect harmful intermetallic phases

Pressure Classes & Sizes:

  • Classes: 150#, 300#, 600#, 900#, 1500#, 2500#

  • Sizes: 1/2" NB to 48" NB

  • End Connections: Flanged (RF/RTJ), Butt weld, Socket weld, Threaded

  • Operation: Handwheel, Gear Operated, Pneumatic Actuator, Electric Actuator, Hydraulic Actuator

Applications & Industries Served:

  • Upstream, midstream, and downstream processing of oil and gas

  • Offshore platforms and offshore pipeline systems

  • Sea water injection and sea water desalination systems

  • Chemical and petrochemical processing facilities

  • Pulp and paper bleaching systems

  • Ship and marine pipe systems

  • Mining and minerals processing (heap leach, tailings)

  • Flue gas desulfurization (FGD) systems for power generation

  • High chloride streams water/wastewater treatment systems

Quality Assurance:

Each valve is checked for dimensions, subjected to hydrostatic shell and seat tests as per API 598, chemical composition tested using spectrometry, and mechanical tests including tensile test, hardness, and impact test based on heat number/batch number. Documentation includes mill test certificates (MTC as per EN 10204 3.1/3.2), material test reports, non destructive examination reports, and pressure test certificates.


Showing all 6 products

Duplex Floating Ball Valve

Duplex Floating Ball Valve

Duplex Floating Ball Valve Body: Duplex Stainless Steel ( A890/A995 1B CD4MCuN, A890/A995 2A CE8MN, A890 1A/A995 3A CD6MN, A890/A995 4A CD3MN, A890 1C CD3MCuN, A890/A995 5A CE3MN) Ball: Duplex Stainless Steel ( A890/A995 1B CD4MCuN, A890/A995 2A CE8MN, A890 1A/A995 3A CD6MN, A890/A995 4A CD3MN, A890 1C CD3MCuN, A890/A995 5A CE3MN) End Cap: Stainless Steel Ball Seat: PTFE Packing: PTFE Stem: Stainless Steel Gland: SS304 Handle: SS304 Nominal Size: DN25 to DN200 Nominal Pressure: Class150 to Class900, PN10 to PN64 Dimensions Unit: mm Class150 DN d L O E H 25 25 127 110 150 100 32 32 140 115 180 103 40 40 165 125 200 123 50 50 178 150 250 130 60 60 190 180 300 163 80 80 203 190 350 181 100 100 229 230 500 232 150 150 394 280 800 307 200 200 457 345 1000 350  

DETAILS
Duplex Globe Valve

Duplex Globe Valve

Duplex Globe Valve Body: Duplex Stainless Steel (A890/A995 1B CD4MCuN, A890/A995 2A CE8MN, A890 1A/A995 3A CD6MN, A890/A995 4A CD3MN, A890 1C CD3MCuN, A890/A995 5A CE3MN) Disc: Duplex Stainless Steel (A890/A995 1B CD4MCuN, A890/A995 2A CE8MN, A890 1A/A995 3A CD6MN, A890/A995 4A CD3MN, A890 1C CD3MCuN, A890/A995 5A CE3MN) Trim: Stainless Steel Seat: EPDM, VITON, Metal Seated Bonnet: Stainless Steel Gland Packing: Graphite, PTFE End Connection: Flanged, Socketweld, Buttweld Nominal Diameter: DN40 to DN400 Nominal Pressure: PN10 to PN63, Class150 to Class300 Dimensions Unit: mm Class150 DN L D C g T H W n-ф 40 165 127 98.5 73 15 214 138 4- ф 15 50 203 152 120.5 92 16 235 160 4- ф19 65 216 178 139.5 105 18 285 200 4- ф19 80 241 190 152.5 127 19 336 200 4- ф19 100 292 229 190.5 157 24 357 224 8- ф19 125 356 254 216 186 24 421 280 8- ф22 150 406 279 241.5 216 26 491 300 8- ф22 200 495 343 298.5 270 29 650 375 8- ф22 250 622 406 362 324 31 762 450 12- ф25 300 698 483 432 381 32 990 500 12- ф25 400 914 597 540 470 37 1104 600 16- ф29  

DETAILS
Duplex Gate Valve

Duplex Gate Valve

Duplex Gate Valve Body: Duplex Stainless Steel (A995 1B, A995 2A, A995 3A, A995 4A, A890 1C, A995 5A) Disc: Duplex Stainless Steel (A995 1B, A995 2A, A995 3A, A995 4A, A890 1C, A995 5A) Stem: Stainless Steel Stem Nut: Brass Bonnet: Stainless Steel Nominal Size: DN40 to DN400 Nominal Pressure: PN10 to PN64, Class150 to Class1500 Dimensions PN16 Unit: mm DN L D D1 D2 b f 40 165 150 110 88 19 3 50 178 165 125 100 19 3 65 190 185 145 120 19 3 80 203 200 160 135 19 3 100 229 220 180 156 19 3 125 254 250 210 186 19 3 150 267 285 240 212 19 3 200 292 340 295 268 20 3 250 330 405 355 318 22 3 300 356 460 410 373 24.5 3 400 406 580 525 433 28 4  

DETAILS
Duplex Dual Plate Check Valve

Duplex Dual Plate Check Valve

Duplex Dual Plate Check Valve Body: Duplex Stainless Steel( A890/A995 5A CE3MN, A890 1C CD3MCuN, A890/A995 4A CD3MN, A890 1A/A995 3A CD6MN, A890/A995 2A CE8MN, A890/A995 1B CD4MCuN) Disc: Duplex Stainless Steel( A890/A995 5A CE3MN, A890 1C CD3MCuN, A890/A995 4A CD3MN, A890 1A/A995 3A CD6MN, A890/A995 2A CE8MN, A890/A995 1B CD4MCuN) Spring: Stainless Steel Stem: Stainless Steel Seat: EPDM, VITON, NBR Nominal Diameter: DN50 to DN600 Nominal Pressure: Class150 to Class2500, PN16 to PN64 Dimensions Unit: mm Class150 DN L D D3 D2 50 60 103 51 58 65 67 122 65 73 80 73 135 80 88 100 73 173 102 108 125 86 195 127 132 150 98 220 152 160 200 127 277 203 210 250 146 337 254 265 300 181 407 305 310 350 184 448 350 355 400 191 512 400 405 450 203 547 450 455 500 219 604 500 505 600 222 715 600 605

DETAILS
Duplex Swing Check Valve

Duplex Swing Check Valve

Duplex Swing Check Valve Body: Duplex Stainless Steel (A890/A995 1B CD4MCuN, A890/A995 2A CE8MN, A890 1A/A995 3A CD6MN, A890/A995 4A CD3MN, A890 1C CD3MCuN, A890/A995 5A CE3MN) Disc: Duplex Stainless Steel (A890/A995 1B CD4MCuN, A890/A995 2A CE8MN, A890 1A/A995 3A CD6MN, A890/A995 4A CD3MN, A890 1C CD3MCuN, A890/A995 5A CE3MN) Trim: Stainless Steel Seat: EPDM, VITON, Metal Seated Gland Packing: Graphite, PTFE End Connection: Flanged, Socketweld, Buttweld Nominal Diameter: DN40 to DN600 Nominal Pressure: PN10 to PN63, Class150 to Class300 Dimensions Unit: mm PN16 DN L H 40 180 129 50 200 147 65 240 161 80 260 178 100 300 190 125 350 265 150 400 285 200 500 345 250 600 394 300 700 420 350 800 455 400 900 520 450 1000 565 500 1100 610 600 1300 740  

DETAILS
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Engineered for Performance. Manufactured for Reliability.

Industrial valves manufactured for durability, quality and reliable performance in demanding applications.

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Duplex Valve Manufacturer in USA - Super Duplex Valve