The Seat,valve, cataloged under National Stock Number 4820-01-223-8545, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-223-8545 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.123 INCHES NOMINAL IN |
| Flange Diameter | 1.677 INCHES MINIMUM AND 1.682 INCHES MAXIMUM IN |
| Body Outside Diameter | 1.427 INCHES MINIMUM AND 1.432 INCHES MAXIMUM IN |
| Criticality Code Justification | ZZZY |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.797 INCHES MINIMUM AND 0.927 INCHES MAXIMUM IN |
| Under Flange Height | 0.129 INCHES NOMINAL IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE OVERALL |
| Seat Angle in Deg | 34.000 MINIMUM AND 35.000 MAXIMUM |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | C |
| Reference | Meaning |
|---|---|
| 803-5001003-X3X1-04 | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 4820-01-223-8545 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-223-8545: Flange Seat to Disk End Height: 0.123 INCHES NOMINAL IN; Flange Diameter: 1.677 INCHES MINIMUM AND 1.682 INCHES MAXIMUM IN; Body Outside Diameter: 1.427 INCHES MINIMUM AND 1.432 INCHES MAXIMUM IN; Criticality Code Justification: ZZZY. 11 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.
NSN 4820-01-223-8545 has DEMIL Code F. Demilitarization may be required before disposal or transfer to non-military entities.
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.