The Valve,ball, cataloged under National Stock Number 4820-01-557-7643, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-557-7643 |
| Item Name | Valve,ball |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMSFOR LEVEL 1 ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Reference | Meaning |
|---|---|
| 2643-825-91 ASSY IRD-W | 5/1 Secondary reference U.S. Government activity |
| 218041445 | 5/1 Secondary reference U.S. Government activity |
| 218041445L1 | 5/1 Secondary reference Naval Sea Systems Command |
| 2643-825-91 ASSY IRD-W-L1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 845-7286651 ASSY IRD-W | 5/1 Secondary reference Naval Sea Systems Command |
| 845-7286651 ASSY IRD-W-L1 | 3/1 Design control — primary reference Naval Inventory Control Point Mechanicsburg |
NSN 4820-01-557-7643 is a Valve,ball, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-557-7643: Criticality Code Justification: ZZZY; Part Name Assigned by Controlling Agency: VALVE BALL 3-WAY; Reference Number Differentiating Characteristics: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMSFOR LEVEL 1 ITEMS. 2 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 4820-01-557-7643 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.