The Disk,valve, cataloged under National Stock Number 4820-01-207-0712, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is William Powell Company, the Dba Powell Valve Div the Starflo Corporation. Government technical data includes 3 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-207-0712 |
| Primary Part Number | 21D644171750017 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
| Status | ACTIVE |
| Pressure Rating | 150.0 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS |
| Outside Diameter | 3.375 INCHES NOMINAL IN |
| Material | STEEL |
| 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 |
|---|---|
| 21D644171750017 PRIMARY | William Powell Company, the Dba Powell Valve Div the Starflo Corporation (USA) |
| 2475BWE-MOD-3IN | William Powell Company, the Dba Powell Valve Div the Starflo Corporation (USA) |
| Reference | Meaning |
|---|---|
| 2475BWE-MOD-3 | 5/9 Secondary reference William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
| 64417 | 5/9 Secondary reference William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
| D-64417 | 5/9 Secondary reference William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
NSN 4820-01-207-0712 is a Disk,valve, manufactured by William Powell Company, the Dba Powell Valve Div the Starflo Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-207-0712 has 2 manufacturer part numbers on file: 21D644171750017 (William Powell Company, the Dba Powell Valve Div the Starflo Corporation), 2475BWE-MOD-3IN (William Powell Company, the Dba Powell Valve Div the Starflo Corporation).
2 possible matches (shared part number, not a government interchangeability claim): 3040-01-309-0822, 6625-01-504-6670. Verify interchangeability with system specifications before substitution.
Key specifications for 21D644171750017: Overall Height: 3.688 INCHES NOMINAL IN; Pressure Rating: 150.0 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS; Outside Diameter: 3.375 INCHES NOMINAL IN; Special Features: STELLITE FACED. 3 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.