The Valve Assembly, cataloged under National Stock Number 4820-01-162-4397, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-162-4397 |
| Primary Part Number | 506-5588397 ASSY 99 |
| Item Name | Valve Assembly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Valve Quantity | 5 |
| Connection Type | FLANGE, ROUND W/HOLES |
| Body Material | STEEL UNS J03002 |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| 506-5588397 ASSY 99 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 506-5588397 | D/9 Drawing number reference only Naval Sea Systems Command |
| 2401-443 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
| 2401-443 ASSY 99 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-162-4397 is a Valve Assembly, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-162-4397 has 1 manufacturer part number on file: 506-5588397 ASSY 99 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-162-6551, 4820-01-175-6510. Verify interchangeability with system specifications before substitution.
Key specifications for 506-5588397 ASSY 99: Valve Quantity: 5; Connection Type: FLANGE, ROUND W/HOLES; Body Material: STEEL UNS J03002; Valve Operation Method: MANUAL. 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.
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.