The Seat,valve, cataloged under National Stock Number 4820-00-100-3308, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-100-3308 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 1.250 INCHES NOMINAL IN |
| Flange Diameter | 10.938 INCHES NOMINAL IN |
| Body Outside Diameter | 9.938 INCHES NOMINAL IN |
| Seal Accommodation Type | GROOVED |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 8.375 INCHES NOMINAL IN |
| Under Flange Height | 2.000 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Seat Angle in Deg | 45.000 NOMINAL |
| 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 |
| Reference | Meaning |
|---|---|
| NL798-1 | 5/9 Secondary reference Dresser-Rand Company |
| NL798-1 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| NL798-1 | 3/9 Design control — primary reference U.S. Government activity |
NSN 4820-00-100-3308 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-100-3308: Flange Seat to Disk End Height: 1.250 INCHES NOMINAL IN; Flange Diameter: 10.938 INCHES NOMINAL IN; Body Outside Diameter: 9.938 INCHES NOMINAL IN; Seal Accommodation Type: GROOVED. 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.