The Disk,valve, cataloged under National Stock Number 4820-01-470-2020, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Velan Valve Corp.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-470-2020 |
| Primary Part Number | 8204-005-031-S |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Shank Diameter | 0.990 INCHES NOMINAL IN |
| Flange Seat to Disk End Height | 0.681 INCHES NOMINAL IN |
| Outside Diameter | 0.375 INCHES NOMINAL IN |
| Nominal Thread Size | 0.250 INCHES IN |
| Thread Class | 2A A |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| 7492-737 ITEM NO.8 | Velan Valve Corp. (USA) |
| 8204-005-031-S PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 7492-737 | D/9 Drawing number reference only Velan Valve Corp. |
NSN 4820-01-470-2020 is a Disk,valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-470-2020 has 2 manufacturer part numbers on file: 7492-737 ITEM NO.8 (Velan Valve Corp.), 8204-005-031-S (Velan Valve Corp.).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-470-2029. Verify interchangeability with system specifications before substitution.
Key specifications for 8204-005-031-S: Shank Diameter: 0.990 INCHES NOMINAL IN; Flange Seat to Disk End Height: 0.681 INCHES NOMINAL IN; Outside Diameter: 0.375 INCHES NOMINAL IN; Nominal Thread Size: 0.250 INCHES 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.