The Seat,valve, cataloged under National Stock Number 4820-00-337-0870, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is The Dewey Electronics Corporation Div Pitometer Log Division. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-337-0870 |
| Primary Part Number | S2522 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | The Dewey Electronics Corporation Div Pitometer Log Division |
| Status | ACTIVE |
| Material | NICKEL OVERALL |
| 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 |
|---|---|
| S2522 | The Dewey Electronics Corporation Div Pitometer Log Division (USA) |
| 140-3ALT1PC12 | The Dewey Electronics Corporation Div Pitometer Log Division (USA) |
| 140-1PC12 | The Dewey Electronics Corporation Div Pitometer Log Division (USA) |
| Reference | Meaning |
|---|---|
| S6505E3002217PC12 | 5/2 Secondary reference U.S. Government activity |
| S6505-665178ALT1 | 3/2 Design control — primary reference U.S. Government activity |
| S6505-925619PC12 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-00-337-0870 is a Seat,valve, manufactured by The Dewey Electronics Corporation Div Pitometer Log Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-337-0870 has 3 manufacturer part numbers on file: S2522 (The Dewey Electronics Corporation Div Pitometer Log Division), 140-3ALT1PC12 (The Dewey Electronics Corporation Div Pitometer Log Division), 140-1PC12 (The Dewey Electronics Corporation Div Pitometer Log Division).
1 possible match (shared part number, not a government interchangeability claim): 4030-01-675-5340. Verify interchangeability with system specifications before substitution.
Key specifications for S2522: Material: NICKEL OVERALL. 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.