The Seat,valve, cataloged under National Stock Number 4820-01-423-7663, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-423-7663 |
| Primary Part Number | 218021462 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Body Outside Diameter | 1.435 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 0.813 INCHES NOMINAL IN |
| Seat Radius | 0.375 INCHES NOMINAL IN |
| Material | PLASTIC SEAT |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 801-6758076 ASSEMBLY 1A FIND 6 | Naval Sea Systems Command (USA) |
| 218021462 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| DF331794 ASSEMBLY 1A FIND 6 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 6758076 | D/9 Drawing number reference only Naval Sea Systems Command |
| 264382023-A6 | 5/2 Secondary reference U.S. Government activity |
| DF331794 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 2643-820-23 | D/9 Drawing number reference only U.S. Government activity |
| 2643-820-23 FN A6 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-423-7663 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-423-7663 has 2 manufacturer part numbers on file: 801-6758076 ASSEMBLY 1A FIND 6 (Naval Sea Systems Command), 218021462 (Naval Sea Systems Command).
Key specifications for 218021462: Overall Height: 0.296 INCHES NOMINAL IN; Body Outside Diameter: 1.435 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 0.813 INCHES NOMINAL IN. 6 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.