The Seat,valve, cataloged under National Stock Number 4820-01-075-8211, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is The Walworth Company. Government technical data includes 10 specifications, 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-075-8211 |
| Primary Part Number | 7584-39Y |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | The Walworth Company |
| Status | ACTIVE |
| Thread Length | 0.250 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | PLAIN THREADED |
| Body Inside Diameter | 3.000 INCHES NOMINAL IN |
| Nominal Thread Size | 3.875 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Material | STEEL OVERALL |
| Seat Angle in Deg | 55.000 NOMINAL |
| Thread Series Designator | UN SINGLE THREADED PORTION |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| NR10911-5 PIECE 4 3IN VL | The Walworth Company (USA) |
| 7584-39Y PRIMARY | The Walworth Company (USA) |
| Reference | Meaning |
|---|---|
| SS845-1889553 PIECE4 3IN | 5/2 Secondary reference U.S. Government activity |
| 2620-922X2 | D/9 Drawing number reference only U.S. Government activity |
| 2620-922X2 PIECE 4 3IN | 3/2 Design control — primary reference U.S. Government activity |
| SS845-1889553 | D/9 Drawing number reference only U.S. Government activity |
| 7584-39-1 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 600285 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 7584-39-Y | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 4820-01-075-8211 is a Seat,valve, manufactured by The Walworth Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-075-8211 has 2 manufacturer part numbers on file: NR10911-5 PIECE 4 3IN VL (The Walworth Company), 7584-39Y (The Walworth Company).
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-185-6665, 4820-01-187-1467, 6150-01-192-0735. Verify interchangeability with system specifications before substitution.
Key specifications for 7584-39Y: Overall Height: 0.625 INCHES NOMINAL IN; Thread Length: 0.250 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: PLAIN THREADED; Body Inside Diameter: 3.000 INCHES NOMINAL IN. 10 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.
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.