Manufacturer, Supplier & Exporter of Duplex Steel Check Valve
Riddhi Siddhi Impex is a leading manufacturer and supplier of Duplex Steel Check Valves in India, catering to a broad range of industrial sectors. Our check valves are precision-engineered using high-grade Duplex Stainless Steel (UNS S31803 / S32205), offering a unique combination of superior corrosion resistance and excellent mechanical strength. Designed for one-way flow control, these valves automatically prevent backflow in piping systems without requiring any manual intervention..
The Duplex Steel Check Valve is particularly suitable for aggressive media, such as seawater, chemical solutions, and high-pressure steam. This makes them ideal for offshore, chemical processing, marine, oil and gas, and water treatment applications. At Riddhi Siddhi Impex, we provide both swing type and lift type check valves, available in a variety of sizes and pressure classes, to meet customized operational requirements.
With our strong logistical network, we are proud to serve as a Duplex Steel Check Valve Domastic supplier across major Indian cities like Mumbai, Delhi, Chennai, Bengaluru (Bangalore), Hyderabad, Pune, Ahmedabad, Kolkata, Surat, and Vadodara. Our presence in both metro cities and industrial hubs ensures timely delivery, project support, and consistent quality across India.
Our Duplex Check Valves conform to international standards like API, ASME, ASTM, and EN, ensuring maximum compatibility and reliability in critical operations. The valves are tested under stringent quality control processes, including hydrostatic and pneumatic tests, ensuring zero leakage and long service life under extreme operating conditions.
One of the key advantages of using Duplex Steel for check valves is its high resistance to chloride-induced stress corrosion cracking, a common failure mode in traditional austenitic stainless steels. In applications such as desalination plants, brine treatment systems, and coastal power plants, this superior resistance offers a longer lifecycle and lower maintenance cost.
Duplex Steel Check Valve
Specifications
| Parameter | Details |
|---|---|
| Valve Type | Check Valve (Non-return valve) |
| Material Grade | Duplex Stainless Steel (UNS S31803 / S32205) |
| Size Range | ½" to 24" (DN15 to DN600) |
| Pressure Rating | 150#, 300#, 600#, up to 2500# |
| End Connections | Flanged, Threaded, Socket Weld, Butt Weld |
| Operation | Swing type, Lift type, Wafer / Lug type |
| Design Standard | API 6D, ASME B16.34, ISO 5208 |
Chemical Composition (Duplex Steel)
| 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 |
| Silicon (Si) | — | 1.0 |
| Carbon (C) | — | 0.030 |
| Nitrogen (N) | 0.08 | 0.20 |
| Iron (Fe) | Balance | — |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa |
| Yield Strength (0.2%) | ≥ 450 MPa |
| Elongation | ≥ 25% |
| Hardness (Brinell) | ≤ 290 HB |
Dimension Chart (Sample Sizes)
| Size | Face-to-Face (mm) | Flange OD (mm) | Weight (kg) |
|---|---|---|---|
| 1" | 127 | 108 | 5.5 |
| 2" | 150 | 152 | 12.0 |
| 4" | 229 | 229 | 32.0 |
| 6" | 305 | 279 | 55.0 |
| 8" | 356 | 343 | 85.0 |
Equivalent Grades & Standards
| Standard | Equivalent Grade / Spec |
|---|---|
| UNS | S31803 / S32205 |
| EN / DIN | 1.4462, X2CrNiMoN22-5-3 |
| ASTM | A182 F51 / F60 |
| ASME | B16.34 |
Other Types of Duplex Steel Valves
| Type | Description |
|---|---|
| Duplex Steel Gate Valve | On/off isolation valve with rising or non-rising stem. |
| Duplex Steel Globe Valve | Used for flow regulation and throttling. |
| Duplex Steel Ball Valve | Quarter-turn valve for shutoff. |
| Duplex Steel Butterfly Valve | Lightweight valve ideal for large diameter lines. |
| Duplex Steel Plug Valve | Rotary plug used for isolation. |
We supply Duplex Check Valves in a wide pressure range from 150# to 2500#, and sizes ranging from ½” to 24”, with end connections such as threaded, socket weld, butt weld, or flanged types. Whether it's a small utility valve or a critical process component, Riddhi Siddhi Impex ensures top-grade materials and precise machining.
Frequently Asked Questions (FAQs)
- Q1: What are typical applications for Duplex Steel Check Valves?
- A1: These valves are used in desalination, marine, oil & gas, chemical plants, and pipelines where corrosion and backflow prevention are critical.
- Q2: Can Duplex Steel Check Valves handle seawater or chloride-rich environments?
- A2: Yes, Duplex Steel’s enhanced corrosion resistance makes these valves suitable for seawater and chloride-exposed services.
- Q3: Do you supply these valves across India?
- A3: Yes, Riddhi Siddhi Impex supplies Duplex Steel Check Valves to cities including Mumbai, Delhi, Bengaluru, Chennai, Hyderabad, Kolkata, Pune, Surat, and many more.
- Q4: What operation types are available?
- A4: We offer swing, lift, wafer and dual-plate check valves, with manual or spring assistance as needed.
Cities we have supplied our products to
Mumbai, Duplex Steel Check Valve Suplier in Delhi, Duplex Steel Check Valve Suplier in Bengaluru(Bangalore), Duplex Steel Check Valve Suplier in Hyderabad, Duplex Steel Check Valve Suplier in Chennai, Duplex Steel Check Valve Suplier in Kolkata, Duplex Steel Check Valve Suplier in Pune, Duplex Steel Check Valve Suplier in Ahmedabad, Duplex Steel Check Valve Suplier in Surat, Duplex Steel Check Valve Suplier in Vadodara, Duplex Steel Check Valve Suplier in Rajkot, Duplex Steel Check Valve Suplier in Nagpur, Duplex Steel Check Valve Suplier in Indore, Duplex Steel Check Valve Suplier in Bhopal, Duplex Steel Check Valve Suplier in Jaipur, Duplex Steel Check Valve Suplier in Kanpur, Duplex Steel Check Valve Suplier in Lucknow, Duplex Steel Check Valve Suplier in Agra, Duplex Steel Check Valve Suplier in Varanasi, Duplex Steel Check Valve Suplier in Amritsar, Duplex Steel Check Valve Suplier in Chandigarh, Duplex Steel Check Valve Suplier in Mysuru (Mysore), Duplex Steel Check Valve Suplier 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Countries we have supplied our products to
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