The Disk,valve, cataloged under National Stock Number 4820-01-222-0425, 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7 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-222-0425 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Taper Minor Diameter | 1.431 INCHES NOMINAL IN |
| Style Designator | SOLID WEDGE |
| Taper Major Diameter | 2.281 INCHES NOMINAL IN |
| Seat Angle | 5.0 DEGREES NOMINAL |
| Taper Length | 4.875 INCHES NOMINAL IN |
| Media for Which Designed | STEAM |
| Material | NICKEL ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| F05431 ITEM 4 4IN | 3/2 Design control — primary reference U.S. Government activity |
| F05431 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-222-0425 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-222-0425: Overall Height: 6.062 INCHES NOMINAL IN; Taper Minor Diameter: 1.431 INCHES NOMINAL IN; Style Designator: SOLID WEDGE; Taper Major Diameter: 2.281 INCHES NOMINAL IN. 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.
NSN 4820-01-222-0425 has DEMIL Code Q. 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.