The Disk and Seat Set,valve, cataloged under National Stock Number 4820-01-504-3793, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Automatic Switch Company Dba Asco. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-504-3793 |
| Primary Part Number | 270645-005 |
| Item Name | Disk and Seat Set,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Automatic Switch Company Dba Asco |
| Status | ACTIVE |
| End Item Source | 04845 |
| 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 |
|---|---|
| AV174565 ITEM NO 11 | Automatic Switch Company Dba Asco (USA) |
| 270645-005 PRIMARY | Automatic Switch Company Dba Asco (USA) |
| Reference | Meaning |
|---|---|
| AV174565 | D/9 Drawing number reference only Automatic Switch Company Dba Asco |
NSN 4820-01-504-3793 is a Disk and Seat Set,valve, manufactured by Automatic Switch Company Dba Asco, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-504-3793 has 2 manufacturer part numbers on file: AV174565 ITEM NO 11 (Automatic Switch Company Dba Asco), 270645-005 (Automatic Switch Company Dba Asco).
1 possible match (shared part number, not a government interchangeability claim): 4810-01-504-3804. Verify interchangeability with system specifications before substitution.
Key specifications for 270645-005: End Item Source: 04845; End Item Identification: SELNOID VALVE P/N AV174565. 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.