The Disk,valve, cataloged under National Stock Number 4820-01-077-1178, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-077-1178 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Shank Diameter | 0.375 INCHES NOMINAL IN |
| Flange Diameter | 2.325 INCHES NOMINAL IN |
| Style Designator | POPPET |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Material | STEEL CORROSION RESISTING |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 87791-4901 ITEM 5 | 5/2 Secondary reference U.S. Government activity |
| 87791-4702 ITEM 4 | 5/9 Secondary reference U.S. Government activity |
| 87791-4702 | D/9 Drawing number reference only U.S. Government activity |
| 516-4775899 ITEM 5 | 5/9 Secondary reference Naval Sea Systems Command |
| 516-4775899 | D/9 Drawing number reference only Naval Sea Systems Command |
| 87791-4901 ITEM 5 | 3/2 Design control — primary reference U.S. Government activity |
| 87791-4702 ITEM 4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-077-1178 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 5360-01-089-9022, 4320-01-114-7137, 4730-01-191-3654. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-077-1178: Shank Diameter: 0.375 INCHES NOMINAL IN; Flange Diameter: 2.325 INCHES NOMINAL IN; Overall Height: 3.385 INCHES NOMINAL IN; Style Designator: POPPET. 5 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.