The Stem,fluid Valve, cataloged under National Stock Number 4820-01-437-2971, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-437-2971 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Valve Type for Which Designed | BALL |
| Stem Actuating End Type | THREADED EXTERNALLY |
| Valve Size for Which Designed | 3.000 INCHES IN |
| Material | NICKEL ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 2178493 | D/9 Drawing number reference only U.S. Government activity |
| 803-2178493 PIECE 33 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-437-2971 is a Stem,fluid Valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 5305-01-713-5391, 5315-01-713-5570, 5310-01-713-5608. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-437-2971: Valve Type for Which Designed: BALL; Stem Actuating End Type: THREADED EXTERNALLY; Valve Size for Which Designed: 3.000 INCHES IN; End Item Identification: SEAWOLF CLASS SSN. 4 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.
NSN 4820-01-437-2971 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.