The Seat,valve, cataloged under National Stock Number 4820-00-200-9056, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-200-9056 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.155 INCHES NOMINAL IN |
| Flange Diameter | 3.552 INCHES MINIMUM AND 3.557 INCHES MAXIMUM IN |
| Body Outside Diameter | 3.302 INCHES MINIMUM AND 3.307 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 1.500 INCHES NOMINAL IN |
| Under Flange Height | 0.280 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE OVERALL |
| Seat Angle in Deg | 34.000 MINIMUM AND 35.000 MAXIMUM |
| 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 |
|---|---|
| 618-24-01 | 5/9 Secondary reference Circor Intl Inc |
| 618-24-16 | 5/9 Secondary reference Circor Intl Inc |
| 426-18-24-0042-0001 | 5/9 Secondary reference Circor Intl Inc |
| 026-18-24-0042-0001 | 3/9 Design control — primary reference Circor Intl Inc |
NSN 4820-00-200-9056 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5962-00-881-0996, 4820-01-011-8264. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-200-9056: Flange Seat to Disk End Height: 0.155 INCHES NOMINAL IN; Flange Diameter: 3.552 INCHES MINIMUM AND 3.557 INCHES MAXIMUM IN; Body Outside Diameter: 3.302 INCHES MINIMUM AND 3.307 INCHES MAXIMUM IN; Style Designator: PLAIN FLANGED. 9 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.