The Disk,valve, cataloged under National Stock Number 4820-01-433-8241, 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 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-433-8241 |
| Primary Part Number | HV19-644-7 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Automatic Switch Company Dba Asco |
| Status | ACTIVE |
| Pressure Rating | 300.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Temp Rating | 340.0 FAHRENHEIT NOMINAL DEGF |
| Style Designator | PLAIN |
| Media for Which Designed | WATER OR OIL |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR |
| 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 |
|---|---|
| HV19-644-7 PRIMARY | Automatic Switch Company Dba Asco (USA) |
| AV262-865-3 | Automatic Switch Company Dba Asco (USA) |
| Reference | Meaning |
|---|---|
| AV262-865 | D/9 Drawing number reference only Automatic Switch Company Dba Asco |
NSN 4820-01-433-8241 is a Disk,valve, manufactured by Automatic Switch Company Dba Asco, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-433-8241 has 2 manufacturer part numbers on file: HV19-644-7 (Automatic Switch Company Dba Asco), AV262-865-3 (Automatic Switch Company Dba Asco).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-433-8326, 4820-01-433-8329. Verify interchangeability with system specifications before substitution.
Key specifications for HV19-644-7: Pressure Rating: 300.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Temp Rating: 340.0 FAHRENHEIT NOMINAL DEGF; Style Designator: PLAIN; Media for Which Designed: WATER OR OIL. 5 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.