The Valve,safety Relief, cataloged under National Stock Number 4820-01-500-4528, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 4 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-500-4528 |
| Primary Part Number | 556-7410495-9 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Style Designator | SCREW-IN CARTRIDGE |
| Material | STEEL CORROSION RESISTING BODY |
| Opening Pressure Setting | 2800.0 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AUTOMATIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 556-7410495-9 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 7410495 | D/9 Drawing number reference only Naval Sea Systems Command |
| 665-3-MOD | 3/2 Design control — primary reference U.S. Government activity |
| B793-6401-9 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-500-4528 is a Valve,safety Relief, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-500-4528 has 1 manufacturer part number on file: 556-7410495-9 (Naval Sea Systems Command).
Key specifications for 556-7410495-9: Style Designator: SCREW-IN CARTRIDGE; End Item Identification: E/I:MANIFOLD ASSY.P/N 7410495-A1,W/S:SEAWOLF CLASS; Material: STEEL CORROSION RESISTING BODY; Opening Pressure Setting: 2800.0 POUNDS PER SQUARE INCH LBS. 4 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.
NSN 4820-01-500-4528 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.