The Valve,butterfly, cataloged under National Stock Number 4820-01-646-5839, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-646-5839 |
| Item Name | Valve,butterfly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | ASTM-A-351 CF8M NATIONAL SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | ASTM-A-351 CF8M NATIONAL SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Operating Pressure | 30.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 4.00 INCHES IN |
| Maximum Operating Temp | 200.00 FAHRENHEIT SINGLE RESPONSE DEGF |
| Face to Face Distance | 2.0 INCHES IN |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING BODY |
| Opening Pressure Setting | 15.00 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| 25040010-1-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-646-5839 is a Valve,butterfly, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-646-5839: Style Designator: STRAIGHT THRU; Material Document and Classification: ASTM-A-351 CF8M NATIONAL SPEC SINGLE MATERIAL RESPONSE BODY; Material Document and Classification: ASTM-A-351 CF8M NATIONAL SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE; Operating Pressure: 30.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. 12 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.