The Seat,valve, cataloged under National Stock Number 4820-01-209-7498, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-209-7498 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Body Outside Diameter | 3.406 INCHES NOMINAL IN |
| Taper Minor Diameter | 0.871 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Taper Major Diameter | 1.167 INCHES NOMINAL IN |
| Body Inside Diameter | 3.094 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Seating Surface Shape | FLAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 749-5-5 | 3/2 Design control — primary reference U.S. Government activity |
| 749-5H PIECE 5 3.00IPS | 5/2 Secondary reference U.S. Government activity |
| 749-5H | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-209-7498 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-210-9664, 5998-01-320-2444. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-209-7498: Overall Height: 1.167 INCHES NOMINAL IN; Body Outside Diameter: 3.406 INCHES NOMINAL IN; Taper Minor Diameter: 0.871 INCHES NOMINAL IN; Style Designator: PLAIN. 7 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.