The unique ring disc design ensures that the disc remains light and responsive even in large sizes, which is essential for rapid non-slam closure. Mounted on a multiple spring and radial guide assembly, the disc moves freely without the frictional forces. Combining two ring-shaped annular flow paths with the excellent pressure recovery properties provided by the diffuser, the minimal pressure drop across the Type N valves gives lifetime energy savings when compared to more conventional check valve designs. Pressure recovery is further enhanced within the NG series due to a wider split-body design to facilitate greater flow efficiency and throughput performance.
Additional information
| Valve Size | 12" to 24" |
|---|---|
| Pressure Class Standard | ASME B16.34 |
| Pressure Class Range | Class 150, 300 |
| Body | Two-Piece Split-Body |
| End Connections | Flanged |
| Face-to-Face Standard | Manufacturer Standard |
| Disc Type | Ring |
| Guiding | Radial |
| Seating | Metal-to-Metal |
| Flow | Axial |
| Type | Non-Slam Anti-Surge |
| Media Application | Potable Water |
| Shut-Off Classification | API 598, ISO 5208 Rate E |
Features & Benefits
- The streamlined internals of the axial check valve range allow for a turbulence free flow path through and around the disc
- The high capacity, smooth flow path results in low pressure drop across all of the axial type valves
- Noreva axial check valve designs use no soft parts and are therefore inherently fire-safe
- There are no wearing parts, for clean services, making it maintenance free
- The springs are sized according to the flow rates to ensure that the valves are in the fully open position during normal use
- The axial design ensures that the disc remains light and responsive even in large sizes
- Mounted on a multiple helical spring and radial guide assembly, the disc moves freely without any frictional forces
- With a flow path both around and through the centre of the disc the flow capacity of the valve is best in class
- Low weight discs, short stroke lengths and spring assistance combine to ensure that it responds quickest to change in flow direction
- The fast response ensures reverse velocity cannot build up to a level that can damage pumps, pipes or related equipment
- Pressure surges can occur when a valve is closed against a moving body of fluid, the quick closure results in a considerably lower pressure peak
Standards & Certifications
| Certifications | Canadian Registration Number (CRN) |
|---|---|
| ANSI NSF 61 – Drinking Water System Components – Health Effects | |
| PED 2014/68/EU CE Mark | |
| Design Standards | ASME B16.5 – Pipe Flanges & Flanged Fittings |
| ASME B16.10 – Face to Face & End Dimenions of Valves | |
| ASME B16.34 – Valve Flanged, Threaded, and Welding End | |
| ASME SA Materials | |
| ASTM A Materials | |
| Quality | IS0 9001:2015 |
