The Disk,valve, cataloged under National Stock Number 4820-01-485-1497, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Eaton Aerospace Llc. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-485-1497 |
| Primary Part Number | 90H304-M |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Eaton Aerospace Llc |
| Status | ACTIVE |
| Pressure Rating | 25.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Media for Which Designed | HYDRAULIC FLUID OR AIR |
| 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 |
|---|---|
| 190000 PIECE 3 | Eaton Aerospace Llc (USA) |
| 90H304-M PRIMARY | Eaton Aerospace Llc (USA) |
| Reference | Meaning |
|---|---|
| 190000 | 5/9 Secondary reference Eaton Corporation Dba Eaton Inoac Div Eaton |
| 190000 | D/9 Drawing number reference only Eaton Aerospace Llc |
| 90H304 | 5/9 Secondary reference Eaton Aerospace Llc |
| 90H304 | C/1 Advisory reference — outside the item-of-supply concept Eaton Corporation Dba Eaton Inoac Div Eaton |
NSN 4820-01-485-1497 is a Disk,valve, manufactured by Eaton Aerospace Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-485-1497 has 2 manufacturer part numbers on file: 190000 PIECE 3 (Eaton Aerospace Llc), 90H304-M (Eaton Aerospace Llc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-520-9577. Verify interchangeability with system specifications before substitution.
Key specifications for 90H304-M: Pressure Rating: 25.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Special Features: THIS DISK STYLE IS A SOLID POPPET, NHA 1/4 INCH CHECK VALVE IN; Media for Which Designed: HYDRAULIC FLUID OR AIR; End Item Identification: W/S DESIGNATOR LOS ANGELES CLASS SSN (688). 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.
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.