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.

Duplex Plug Valve

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Duplex Basket Strainer

Duplex Basket Strainer Body: Carbon Steel, CF8, CF8M, CF3M, Cast Iron, SS304, SS316 Screen: SS304, SS304L, SS316, SS316L Gasket: Graphite+Stainless Steel Cover: A105, F304, F304L, F316, F316L Cover Ball: A193 B7, A193 B8, A193 B8M Cover Nut: 2H Drain Plug: A193 B7, A193 B8, A193 B8M Nominal Diameter: DN25 to DN200 Nominal Pressure: Class125 to Class300, PN10 to PN420 Design and Manufacture Standard: ASME B16.34 Flanged End Dimension: ANSI B16.1, BS EN 1092-2, DIN2501 Screwed End Dimension: A

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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, C

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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

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Duplex Wafer Butterfly Valve

Duplex Wafer Butterfly 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 Seat: EPDM Seal: Graphite, PTFE Shaft: Stainless Steel Nominal Size: DN50 to DN200 Nominal Pressure: PN10 to PN64, Class150 to Class1500 Dimensions PN16 Unit: mm <t

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Duplex Lug Butterfly Valve

Duplex Lug Butterfly 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 Seat: EPDM Seal: Graphite, PTFE Shaft: Stainless Steel Nominal Size: DN50 to DN300 Nominal Pressure: PN10, PN16, PN40, Class150, Class300, Class600 Dimensions PN10 Unit: mm <t

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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</t

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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

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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

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Duplex Trunnion Ball Valve

Duplex Trunnion Ball Valve Trunnion: 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) O Ring: VITON 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) Bush: PTFE 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) Seat Ring: PTFE, EPDM</

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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

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