The Piston,valve, cataloged under National Stock Number 4820-01-178-2900, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-178-2900 |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Material | STEEL |
| 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 |
|---|---|
| 1-JH-3347 | 5/9 Secondary reference Westinghouse Electric Corp Power Generation-Generator Div |
| 3286792 | D/9 Drawing number reference only U.S. Government activity |
| 1-JC6336-01 | 5/9 Secondary reference Westinghouse Electric Corp Power Generation-Generator Div |
| 1-JH-3347 PIECE 7 | 3/9 Design control — primary reference Westinghouse Electric Corp Power Generation-Generator Div |
| 1-JH-3317 PIECE 7 | 5/9 Secondary reference Westinghouse Electric Corp Power Generation-Generator Div |
| 904A543-1 | C/1 Advisory reference — outside the item-of-supply concept Westinghouse Electric Corp |
| 1-JC-6336 | 5/9 Secondary reference Westinghouse Electric Corp Power Generation-Generator Div |
| 3286792 PIECE 7 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-178-2900 is a Piston,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-180-9800, 4820-01-180-9801, 4820-01-180-9976. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-178-2900: Material: STEEL. 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.