The Ball Seat Assembly, cataloged under National Stock Number 4820-01-191-3646, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Ball Seat Assembly |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-191-3646 |
| Item Name | Ball Seat Assembly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Reference | Meaning |
|---|---|
| 87794-2001 ITEM 4,5 | 5/2 Secondary reference U.S. Government activity |
| 518-4775892 ITEM 4,5 | 3/2 Design control — primary reference U.S. Government activity |
| 87794-2001 | D/9 Drawing number reference only U.S. Government activity |
| 518-4775892 | D/9 Drawing number reference only U.S. Government activity |
| 2641-809-42PC6X | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 4820-01-191-3646 is a Ball Seat Assembly, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4730-01-200-8028. Verify interchangeability with system specifications before substitution.
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.