The Disk,valve, cataloged under National Stock Number 4820-01-067-6570, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-067-6570 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Shoulder Width | 0.188 INCHES NOMINAL IN |
| Shoulder Height | 0.054 INCHES NOMINAL IN |
| Style Designator | PLUG |
| Seat Angle | 75.0 DEGREES NOMINAL |
| Nominal Thread Size | 0.750 INCHES IN |
| Thread Class | 2A A |
| Material | NICKEL ALLOY |
| Thread Series Designator | UNEF |
| 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 |
|---|---|
| 2620-925X4 | D/9 Drawing number reference only William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
| 2620-925X4PC17ASSYA1-2IN | 3/2 Design control — primary reference U.S. Government activity |
| F26534REVC | D/9 Drawing number reference only William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
| 2620-925X4PC17ASSYA1-2IN | 5/9 Secondary reference William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
| SS8452181284 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-067-6570 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4730-01-067-9923. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-067-6570: Overall Height: 0.625 INCHES NOMINAL IN; Shoulder Width: 0.188 INCHES NOMINAL IN; Shoulder Height: 0.054 INCHES NOMINAL IN; Style Designator: PLUG. 8 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.