Duplex Steel Butterfly Valve

Manufacturer, Supplier & Exporter of Duplex Steel Butterfly Valve

Riddhi Siddhi Impex is a leading manufacturer and trusted Duplex Steel Butterfly Valve Domastic Supplier in India, delivering exceptional valve solutions tailored for high-performance industrial use. These valves are widely used in chemical, petrochemical, marine, and offshore applications due to their excellent resistance to corrosion and high strength-to-weight ratio. Made from premium grades like Duplex Steel UNS S31803 / S32205, these butterfly valves ensure reliability in aggressive environments.

The Duplex Steel Butterfly Valve features a disc mounted on a rotating shaft. When the valve is fully open, the disc is rotated a quarter turn to allow fluid to pass through, and when closed, the disc is rotated again to block the flow. This simple yet effective mechanism allows for rapid shutoff and control in pipelines. It is ideal for use in systems where space, weight, and ease of operation are essential considerations.

Duplex stainless steels are known for their superior mechanical strength and resistance to chloride-induced stress corrosion cracking, making these valves perfect for marine environments and desalination plants. These valves can handle extreme pressure and temperature conditions while maintaining long service life, ensuring minimal maintenance..

Riddhi Siddhi Impex manufactures these valves in various pressure classes and sizes, ranging from DN15 to DN1200, and offers multiple operation types like manual gear operation, pneumatic actuation, and electric actuation. All valves are manufactured to international standards such as API 609, ASME B16.34, and EN 593, ensuring their compatibility with global industrial requirements.

As a Duplex Steel Butterfly Valve Domastic Supplier, Riddhi Siddhi Impex serves a broad range of cities across India. Major industrial zones such as Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, and Surat rely on their timely supply and quality assurance. The company has also extended its reach to tier-2 and tier-3 cities like Rajkot, Vadodara, Bhopal, Jaipur, Coimbatore, and Nashik, ensuring industrial valves are accessible across sectors.

Duplex Steel Butterfly Valve Specifications

Specification	Details
Product	Duplex Steel Butterfly Valve
Material Grade	UNS S31803 / UNS S32205
Size Range	DN15 to DN1200
Pressure Rating	PN10, PN16, PN25, PN40
Operation	Manual, Pneumatic, Electric
End Connection	Wafer, Lug, Flanged
Temperature Range	-46°C to +300°C
Standards	API 609, ASME B16.34, EN 593

Chemical Composition (UNS S31803 / S32205)

Element	Min %	Max %
Chromium (Cr)	21.0	23.0
Nickel (Ni)	4.5	6.5
Molybdenum (Mo)	2.5	3.5
Manganese (Mn)	—	2.0
Carbon (C)	—	0.030
Silicon (Si)	—	1.0
Phosphorus (P)	—	0.03
Sulfur (S)	—	0.02
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	620 MPa min
Yield Strength (0.2% Offset)	450 MPa min
Elongation	25% min
Hardness (Brinell)	290 HB max

Dimension Chart (Sample - DN50 to DN200)

DN	Face to Face (mm)	OD (mm)	No. of Holes	Bolt Circle (mm)
50	43	165	4	125
80	46	200	8	160
100	52	220	8	180
150	56	285	8	240
200	60	340	12	295

Equivalent Grades and Standards

Standard	Grade
ASTM	A890 Gr 4A (UNS S31803)
EN	1.4462
ASME	SA 351
JIS	SCS14A

Other Duplex Steel Valve Types

Type	Description
Gate Valve	Used for on/off control of fluids
Globe Valve	Designed for throttling flow
Ball Valve	Quarter-turn valve for isolation
Check Valve	Prevents reverse flow
Needle Valve	Precision flow control
Plug Valve	Rotating plug for flow control
Diaphragm Valve	Corrosion-resistant and sanitary

Another highlight of Duplex Steel Butterfly Valves is their bi-directional sealing and low torque operation, which reduces operational costs over the long term. These valves are highly suitable for applications requiring on/off services or flow throttling. With elastomer-lined or metal-seated variants, the valves can be customized for a wide range of fluid types including seawater, chemical slurries, acids, and more.

Frequently Asked Questions (FAQs)

Q1: What are Duplex Steel Butterfly Valves used for?

A1: They are widely used in marine, chemical, oil & gas, and desalination applications where corrosion resistance is crucial.

Q2: What size range is available for Duplex Steel Butterfly Valves?

A2: Sizes typically range from DN15 to DN1200, suitable for various industrial applications.

Q3: Do you offer actuated Duplex Butterfly Valves?

A3: Yes, we provide manual, pneumatic, and electric actuation options.

Q4: Are Duplex Butterfly Valves suitable for seawater?

A4: Absolutely. Duplex steel’s high resistance to chloride stress corrosion makes it ideal for seawater systems.