The Valve,safety Relief, cataloged under National Stock Number 4820-01-135-2456, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Alfariver Defense S.l. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-135-2456 |
| Primary Part Number | RE0295872 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Alfariver Defense S.l |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | INVERTED FLARE (PIPE) FIRST END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | QQ-A-225/6,T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Adjustable Pressure Range | +0.0 TO 150.0 POUNDS PER SQUARE INCH LBS |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Opening Pressure Setting | 0.5 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 150.0 POUNDS PER HOUR LBS |
| 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 |
| Part Number | Manufacturer |
|---|---|
| RE0295872 | Alfariver Defense S.l (ESP) |
| Reference | Meaning |
|---|---|
| 10145354 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| LT1038-09 | 5/9 Secondary reference Servicios Y Proyectos Avanzados S.a. |
| D559A12D150 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-135-2456 is a Valve,safety Relief, manufactured by Alfariver Defense S.l, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-135-2456 has 1 manufacturer part number on file: RE0295872 (Alfariver Defense S.l).
Key specifications for RE0295872: Flow Control Device: POPPET; Connection Style: INVERTED FLARE (PIPE) FIRST END; Connection Type: THREADED EXTERNAL PIPE FIRST END; Style Designator: STRAIGHT THRU. 12 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.