NRV (Non-Return Valves)
What are NRV (Non-Return Valves) ?
NRVs or Non-Return Valves are unidirectional flow valves designed to prevent backflow in sanitary fluid systems. These valves automatically close when reverse flow occurs, ensuring protection of upstream equipment, preventing contamination, and maintaining hygiene in dairy production lines.
Asiad Steel Industries supplies high-grade NRVs specifically designed for the dairy and beverage industry, offering bubble-tight sealing and compatibility with CIP/SIP systems.
Key Features
- Backflow Prevention – Stops reverse flow and fluid contamination.
- Spring-Loaded Design – Ensures responsive closing action under low pressure.
- Fully Hygienic – Minimal crevices and polished surfaces for food safety.
- Vertical or Horizontal Installation – Flexibility for various pipe layouts.
- Long Service Life – Built using SS 304 / 316L and food-grade elastomers.
Types of Dairy NRVs
- Spring-Loaded Disc Type
- Y-Type NRV
- Clamp / SMS / Weld End NRVs
- Vertical and Horizontal Installation Models
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Details |
|---|---|
| Size Range | ½” to 4” |
| Body Material | SS 304 / SS 316L |
| Spring Material | SS 316 / SS 302 |
| Seal Material | EPDM, Silicone, PTFE |
| End Connections | Clamp, SMS, DIN, Weld |
| Standards | 3A, ISO, IDF, DIN, SMS |
| Parameter | Details |
|---|---|
| Size Range | ½” to 4” |
| Body Material | SS 304 / SS 316L |
| Spring Material | SS 316 / SS 302 |
| Seal Material | EPDM, Silicone, PTFE |
| End Connections | Clamp, SMS, DIN, Weld |
| Standards | 3A, ISO, IDF, DIN, SMS |
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 12.0 |
| Manganese (Mn) | ≤ 2.00 |
| Carbon (C) | ≤ 0.03 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Standard | Equivalent Grade |
|---|---|
| ASTM | A240 TP304 / TP316L |
| EN | X5CrNi18-10 / X2CrNiMo17-12-2 |
| DIN | 1.4301 / 1.4404 |
| JIS | SUS 304 / SUS 316L |
| Valve Size (Inch) | Type | Approx. Weight (kg) |
|---|---|---|
| 1” | Clamp End NRV | 1.6 |
| 1½” | SMS End NRV | 2.8 |
| 2” | Y-Type Clamp NRV | 4.3 |
| 3” | Horizontal Weld End | 5.6 |
Applications of NRV (Non-Return Valves)
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
Where should NRVs be installed in a dairy system?
NRVs are commonly placed before tanks, pumps, or backflow-sensitive equipment to ensure unidirectional flow.
Can NRVs handle cleaning agents?
Yes. They are fully compatible with CIP/SIP operations and caustic cleaning fluids.
Are these valves serviceable?
Yes. The valve can be disassembled for cleaning or seal replacement without special tools.
Do you offer NRVs in different end connections?
Absolutely. We supply Clamp, SMS, DIN, and weld-end NRVs based on your system needs.
