The Seat,valve, cataloged under National Stock Number 4820-00-577-7672, 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7 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-00-577-7672 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Body Outside Diameter | 4.001 INCHES MINIMUM AND 4.002 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 2.250 INCHES NOMINAL IN |
| Seat Radius | 0.625 INCHES NOMINAL IN |
| Material | CHROMIUM OR COBALT FACE |
| Material | NICKEL OR CHROMIUM ALLOY BODY |
| Seating Surface Shape | RADIAL |
| 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 |
|---|---|
| NL996 | 5/9 Secondary reference U.S. Government activity |
| NL996-1 | 3/9 Design control — primary reference U.S. Government activity |
NSN 4820-00-577-7672 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-577-7672: Overall Height: 0.875 INCHES NOMINAL IN; Body Outside Diameter: 4.001 INCHES MINIMUM AND 4.002 INCHES MAXIMUM IN; Style Designator: PLAIN; Body Inside Diameter: 2.250 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.
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.