The Seat,valve, cataloged under National Stock Number 4820-01-203-5433, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-203-5433 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.812 INCHES NOMINAL IN |
| Flange Diameter | 2.280 INCHES NOMINAL IN |
| Body Outside Diameter | 2.222 INCHES NOMINAL IN |
| Taper Minor Diameter | 1.980 INCHES NOMINAL IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | ASTM-A105 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Taper Major Diameter | 2.220 INCHES NOMINAL IN |
| Body Inside Diameter | 1.906 INCHES NOMINAL IN |
| Taper Length | 2.278 INCHES MINIMUM AND 2.281 INCHES MAXIMUM IN |
| Under Flange Height | 0.093 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 |
|---|---|
| 845-2445174 PIECE 4 | 5/2 Secondary reference U.S. Government activity |
| 2632-928X1 PIECE 4 | 3/2 Design control — primary reference U.S. Government activity |
| 845-2445174 | D/9 Drawing number reference only U.S. Government activity |
| 2632-928X1 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-203-5433 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-203-5433: Flange Seat to Disk End Height: 0.812 INCHES NOMINAL IN; Flange Diameter: 2.280 INCHES NOMINAL IN; Body Outside Diameter: 2.222 INCHES NOMINAL IN; Taper Minor Diameter: 1.980 INCHES NOMINAL IN. 12 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.