The Housing,gear Box,valve, cataloged under National Stock Number 4820-01-254-7434, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Huntington Ingalls Inc Div Newport News Shipbuilding. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-254-7434 |
| Primary Part Number | 4457023 AND 4457021 ITEM 119 |
| Item Name | Housing,gear Box,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Huntington Ingalls Inc Div Newport News Shipbuilding |
| Status | ACTIVE |
| General Characteristics Item Description | CAST STEEL (HY-80);HULL EXHAUST VALVE GEAR BOX;AIR IND/DSL EXH HULL AND BACK-UP VALVE |
| 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 |
|---|---|
| 4457023 AND 4457021 ITEM 119 PRIMARY | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| Reference | Meaning |
|---|---|
| 6503-86 PIECE 119 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 6503-86 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-254-7434 is a Housing,gear Box,valve, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-254-7434 has 1 manufacturer part number on file: 4457023 AND 4457021 ITEM 119 (Huntington Ingalls Inc Div Newport News Shipbuilding).
Key specifications for 4457023 AND 4457021 ITEM 119: General Characteristics Item Description: CAST STEEL (HY-80);HULL EXHAUST VALVE GEAR BOX;AIR IND/DSL EXH HULL AND BACK-UP VALVE. 1 specification is 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.