The Seat,valve, cataloged under National Stock Number 4820-01-067-9722, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-067-9722 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.250 INCHES NOMINAL IN |
| Flange Diameter | 4.812 INCHES NOMINAL IN |
| Thread Length | 0.531 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Material Document and Classification | QQ-N-288 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 3.938 INCHES NOMINAL IN |
| Nominal Thread Size | 4.531 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.531 INCHES NOMINAL IN |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Material | NICKEL ALLOY OVERALL |
| Thread Series Designator | UNS SINGLE THREADED PORTION |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 803-1385637PC8 4IN | 5/9 Secondary reference Naval Sea Systems Command |
| 810-1385637PC8 4IN VALVE | 5/9 Secondary reference Naval Sea Systems Command |
| 803-1385637-04X-08 | 3/2 Design control — primary reference U.S. Government activity |
| 803-1385637 | D/9 Drawing number reference only U.S. Government activity |
| 810-1385637 PIE | 5/9 Secondary reference U.S. Government activity |
| 803-B85637-03X-08 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-067-9722 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-067-9722: Flange Seat to Disk End Height: 0.250 INCHES NOMINAL IN; Flange Diameter: 4.812 INCHES NOMINAL IN; Thread Length: 0.531 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 13 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.