Check valves Danfoss
| Model | Connection size | Connection type | Δp* bar |
| NRV 16S | 5/8" | ODF solder | 0.05 |
| NRVH 16S | 5/8" | ODF solder | 0.30 |
| NRVH 19S | 3/4" | ODF solder | 0.30 |
| NRV 22S | 7/8" | ODF solder | 0.05 |
| NRVH 22S | 7/8" | ODF solder | 0.30 |
| NRVH 28S | 1-1/8" | ODF solder | 0.30 |
*Δp - the minimum pressure at which the valve is completely open
NRVH equipped with a stronger spring than NRV