NRV
What are NRVs?
Non-return valves (NRVs), also known as check valves, allow fluid to flow in one direction only and automatically prevent backflow. These valves are essential in protecting equipment from reverse flow damage and maintaining system pressure.
Asiad Steel Industries manufactures durable NRVs under the Racer brand, for critical applications where flow direction must be regulated reliably and safely.
Key Features
Leak-Proof
Jointing
Robust
Construction
High Pressure
Resistance
Standards
Compliant
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Pipe Size (NPS) | ½” to 48” (DN15 – DN1200) |
| Pressure Ratings | ANSI / ASME Class | Class 150, 300, 600, 900, 1500, 2500 |
| PN Ratings | PN6, PN10, PN16, PN25, PN40, PN64 | |
| Valve Types | NRV Types | Wafer Type, DCV Type |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Standards & Certifications | ASME / ANSI | ASME B16.34, ASME B16.10 (Face-to-Face), ASME B16.5 (Flanged Ends) |
| ASTM | ASTM A182, ASTM A351 | |
| European Standards | EN 12334, EN 558 | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175, IBR Approved | |
| Design Features | Wall Thickness | As per ASME B36.10 (CS), ASME B36.19 (SS), customized options |
| End Connections | Wafer, Flanged, Threaded, Socket Weld Ends | |
| Tolerance | As per ASME / ANSI standards | |
| Coating & Surface Finish | Anti-Corrosion Coating | Rust Preventive Oil, Black Oxide, Hot-Dip Galvanized |
| Optional Coatings | Epoxy, PTFE, Polyurethane | |
| Surface Finish | Machined, Pickled, Polished, Passivated | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic |
| Non-Destructive Testing | Radiography (RT), Ultrasonic (UT), Magnetic Particle (MPI), Dye Penetrant (DPT) | |
| Destructive Testing | Tensile, Hardness, Impact |
Dimensions
| Nominal Size (NPS/DN) | Face-to-Face Length (L) | Valve Diameter (D) | Bolt Circle Diameter (BCD) | Number of Bolts (n) | Bolt Size (mm) | Overall Height (H) | Disc Diameter (d) | Wafer Thickness (t) |
|---|---|---|---|---|---|---|---|---|
| ½” / DN15 | 50 | 70 | 90 | 4 | M12 | 60 | 14 | 8 |
| ¾” / DN20 | 60 | 80 | 100 | 4 | M12 | 65 | 18 | 8 |
| 1″ / DN25 | 70 | 90 | 110 | 4 | M12 | 70 | 22 | 10 |
| 1¼” / DN32 | 80 | 100 | 125 | 4 | M16 | 80 | 28 | 10 |
| 1½” / DN40 | 90 | 110 | 135 | 4 | M16 | 85 | 34 | 12 |
| 2″ / DN50 | 100 | 125 | 150 | 4 | M16 | 95 | 42 | 12 |
| 2½” / DN65 | 120 | 145 | 170 | 4 | M16 | 110 | 54 | 14 |
| 3″ / DN80 | 130 | 160 | 185 | 8 | M16 | 120 | 65 | 14 |
| 4″ / DN100 | 150 | 190 | 210 | 8 | M20 | 140 | 85 | 16 |
| 5″ / DN125 | 170 | 215 | 240 | 8 | M20 | 160 | 105 | 18 |
| 6″ / DN150 | 200 | 240 | 265 | 8 | M20 | 180 | 125 | 18 |
| 8″ / DN200 | 250 | 295 | 320 | 8 | M24 | 220 | 165 | 20 |
| 10″ / DN250 | 300 | 350 | 375 | 12 | M24 | 260 | 210 | 22 |
| 12″ / DN300 | 350 | 400 | 430 | 12 | M27 | 300 | 250 | 24 |
| 14″ / DN350 | 400 | 460 | 495 | 12 | M30 | 340 | 290 | 26 |
| 16″ / DN400 | 450 | 510 | 550 | 16 | M30 | 380 | 330 | 28 |
| 18″ / DN450 | 500 | 560 | 600 | 16 | M33 | 420 | 375 | 30 |
| 20″ / DN500 | 550 | 610 | 650 | 16 | M36 | 460 | 420 | 32 |
| 24″ / DN600 | 650 | 715 | 760 | 20 | M36 | 550 | 500 | 36 |
| 30″ / DN750 | 750 | 840 | 880 | 20 | M42 | 650 | 625 | 40 |
| 36″ / DN900 | 850 | 950 | 990 | 24 | M42 | 750 | 750 | 45 |
| 42″ / DN1050 | 950 | 1060 | 1100 | 24 | M48 | 850 | 875 | 50 |
| 48″ / DN1200 | 1050 | 1160 | 1200 | 28 | M48 | 950 | 1000 | 55 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 485 – 750 | MPa |
| Yield Strength | 170 – 450 | MPa |
| Hardness | 120 – 200 | HB (Brinell) |
| Elongation | ≥ 20 – 30 | % |
| Density | 7.8 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 27 – 70 | J (Charpy) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 250 – 450 | MPa |
| Corrosion Resistance | Excellent | – |
| Thermal Conductivity | 15 – 50 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.40 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 200 | HB |
| Surface Finish | Machined, Polished, Passivated | – |
| Operating Temperature Range | -46 to 600 | °C |
| Pressure Rating | PN10, PN16, PN25, PN40, PN64 | As per ASME/ANSI & ISO standards |
| Body Type | Wafer Type / DCV Type | – |
| End Connections | Flanged, Threaded, Butt Weld | – |
| Valve Disc | Stainless Steel | – |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) | SS 316 (%) | SS 316L (%) |
|---|---|---|---|---|
| Carbon (C) | ≤ 0.08 | ≤ 0.03 | ≤ 0.08 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 | 10.0 – 14.0 | 10.0 – 14.0 |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
| Nitrogen (N) | — | — | ≤ 0.10 | ≤ 0.10 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
Applications of NRVs
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
Can NRVs be installed vertically and horizontally?
How do NRVs prevent water hammer?
What’s the difference between a swing check and a lift check valve?
Are NRVs suitable for slurry or viscous media?
