Wafer NRV Type
What is an NRV Wafer Type?
An NRV Wafer Type (Non-Return Valve) is a slim, compact valve that allows fluid to flow in only one direction, preventing reverse flow in a pipeline. It fits between two flanges without requiring extra face-to-face dimensions. Unlike bulky swing check valves, wafer types are lightweight and ideal for compact installations.
Asaid Steel Industries is a trusted NRV Wafer Type manufacturer and supplier in Pune, delivering durable, compact, and efficient non-return valves for water, oil & gas, chemical, and HVAC applications. Our precision-engineered valves ensure leak-tight sealing, corrosion resistance, and long service life, making us a reliable choice for industrial flow systems across India
Key Features
Leak-Proof
Jointing
Robust
Construction
High Pressure
Resistance
Standards
Compliant
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Size | 40 mm to 600 mm (custom sizes available) |
| Pressure Ratings | ANSI / ASME Class | Class 150, 300, 600 |
| PN Ratings | PN6, PN10, PN16, PN25 | |
| Product Types | NRV Wafer Type Valves | Single Disc, Dual Plate, Spring Loaded |
| Material Options | Body Materials | Cast Iron, Ductile Iron, Stainless Steel (SS304, SS316), Carbon Steel, Bronze |
| Disc Materials | Stainless Steel (SS304, SS316), Bronze, Ductile Iron with Epoxy | |
| Seat Options | Metal-to-Metal, EPDM, NBR, Viton | |
| Standards & Certifications | Design Standards | API 594, BS 5155, EN 593 |
| Testing Standards | API 598, ISO 5208 | |
| Certifications | ISO 9001, CE, PED 2014/68/EU | |
| Design Features | End Connections | Wafer Type (Fits between flanges) |
| Flange Standards | ANSI B16.5, DIN PN10/PN16, BS 4504 | |
| Face-to-Face | ISO 5752 / EN 558 Series 20 | |
| Flow Direction | Uni-directional | |
| Coating & Surface Finish | Body Coating | Fusion Bonded Epoxy (FBE), Paint, Galvanized |
| Optional Coatings | PTFE Lining, Rubber Lining | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic |
| Non-Destructive Testing | Ultrasonic (UT), Dye Penetrant (DPT) | |
| Functional Testing | Leak Tightness, Cycle Testing |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 400 – 750 | MPa (Cast Iron, Ductile Iron, Stainless Steel, Carbon Steel) |
| Yield Strength | 200 – 450 | MPa |
| Hardness | 100 – 220 | HB (Brinell) |
| Elongation | ≥ 10 – 25 | % (material-dependent) |
| Density | 7.1 – 7.9 | g/cm³ |
| Impact Toughness | ≥ 20 – 70 | J (Charpy, grade-dependent) |
| Modulus of Elasticity (E) | ~190 – 210 | GPa |
| Fatigue Strength | 180 – 400 | MPa |
| Corrosion Resistance | Good to Excellent (SS > DI > CI > CS) | – |
| Thermal Conductivity | 20 – 55 | W/m·K |
| Coefficient of Thermal Expansion | 10 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.45 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 100 – 220 | HB |
| Surface Finish | Epoxy Coated / Painted / Polished (as per service conditions) | – |
| Connection Type | Wafer (fits between flanges) | – |
| Operating Temperature Range | -20 to 300 | °C (material-dependent) |
| Pressure Rating | PN6, PN10, PN16 | EN 593 / ISO 5752 Standards |
Equivalent Standards
| Standard | Compatibility |
|---|---|
| API 594 | Wafer Check Valve Design |
| ASME B16.5 | Flanged Connection Standards |
| ISO 5752 | Valve Face-to-Face Dimensions |
| EN 558 | European Valve Dimensioning |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) | SS 316 (%) | SS 316L (%) |
|---|---|---|---|---|
| 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 |
| 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 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
Applications of NRV Wafer Type
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What does an NRV Wafer Type valve do?
Where are wafer-type NRVs commonly used?
Are NRV wafer valves suitable for vertical installations?
Does Asaid Steel Industries supply custom-sized wafer NRVs?
