The Disk,valve, cataloged under National Stock Number 4820-00-032-5123, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Automatic Switch Company Dba Asco. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-032-5123 |
| Primary Part Number | FV20-788-3 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Automatic Switch Company Dba Asco |
| Status | ACTIVE |
| Shank Diameter | 0.233 INCHES NOMINAL IN |
| Flange Seat to Disk End Height | 0.085 INCHES NOMINAL IN |
| Flange Diameter | 0.308 INCHES NOMINAL IN |
| Style Designator | CONE CHECK |
| Seat Angle | 30.0 DEGREES NOMINAL |
| Under Flange Height | 0.715 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| FV20-788-3 PRIMARY | Automatic Switch Company Dba Asco (USA) |
| Reference | Meaning |
|---|---|
| FV20-788REVAITEM3 | 5/9 Secondary reference Automatic Switch Company Dba Asco |
| 571-4903-1486553REVAPC27 | 5/9 Secondary reference U.S. Government activity |
| GV38-576REVAPC19 | 5/9 Secondary reference Automatic Switch Company Dba Asco |
| 571-4903-1486558REVAPC19 | 5/9 Secondary reference U.S. Government activity |
| AV57-722PC22 | 5/9 Secondary reference Automatic Switch Company Dba Asco |
| AV37-760PC19 | 5/9 Secondary reference Automatic Switch Company Dba Asco |
| AV37-663PC19 | 5/9 Secondary reference Automatic Switch Company Dba Asco |
| GV38-585PC19 | 5/9 Secondary reference Automatic Switch Company Dba Asco |
| AV37-096PC27 | 5/9 Secondary reference Automatic Switch Company Dba Asco |
| GV37-156REVAPC27 | 5/9 Secondary reference Automatic Switch Company Dba Asco |
| 571-4903-1486557REVAPC19 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-032-5123 is a Disk,valve, manufactured by Automatic Switch Company Dba Asco, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-032-5123 has 1 manufacturer part number on file: FV20-788-3 (Automatic Switch Company Dba Asco).
Key specifications for FV20-788-3: Shank Diameter: 0.233 INCHES NOMINAL IN; Flange Seat to Disk End Height: 0.085 INCHES NOMINAL IN; Flange Diameter: 0.308 INCHES NOMINAL IN; Overall Height: 0.835 INCHES NOMINAL IN. 7 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.