The Valve,safety Relief, cataloged under National Stock Number 4820-01-442-2579, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-442-2579 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Connection Type | THREADED INTERNAL TUBE ALL ENDS |
| Nominal Outside Diameter Tube Accommodated | 1.250 INCHES ALL ENDS IN |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.625 INCHES ALL ENDS IN |
| Thread Quantity Per Inch | 2B ALL ENDS |
| Thread Series Designator | UN ALL ENDS |
| Valve Operation Method | AUTOMATIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| DRO-2210 | 5/2 Secondary reference U.S. Government activity |
| 6405539 | 5/9 Secondary reference Naval Sea Systems Command |
| 801-6405539-AY5 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 801-6405539-AY55 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 211086988 | 3/2 Design control — primary reference U.S. Government activity |
| 211086988 | 3/9 Design control — primary reference Naval Sea Systems Command |
NSN 4820-01-442-2579 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-442-2579: Connection Type: THREADED INTERNAL TUBE ALL ENDS; Nominal Outside Diameter Tube Accommodated: 1.250 INCHES ALL ENDS IN; Thread Direction: RIGHT-HAND ALL ENDS; Nominal Thread Size: 1.625 INCHES ALL ENDS IN. 7 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.