The Valve,vacuum Breaking, cataloged under National Stock Number 4820-01-066-9474, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-066-9474 |
| Item Name | Valve,vacuum Breaking |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | CONE |
| First End Thread Direction | RIGHT-HAND |
| Body Style | SINGLE CONNECTION, STRAIGHT FLOW |
| First End Style Designator | PLAIN |
| Material Document and Classification | QQ-B-626, ALLOY 360, 1/2H FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-B-626, ALLOY 360, 1/2H FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| End Connection Quantity | 1 |
| First End Connection Type | THREADED EXTERNAL PIPE |
| Temp Adjustability | NOT ADJUSTABLE |
| First End Nominal Pipe Size Accommodated | 0.250 INCHES IN |
| Material | COPPER ALLOY 360 BODY |
| Material | COPPER ALLOY 360 FLOW CONTROL DEVICE |
| Media for Which Designed | ANY ACCEPTABLE |
| Absolute Pressure Setting | 0.5 |
| 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 |
|---|---|
| P4-2628 | 5/9 Secondary reference U.S. Government activity |
| P4-262B | 3/2 Design control — primary reference U.S. Government activity |
| 975509-1 | 5/9 Secondary reference Raytheon Company Div Corp |
| 975509-1 | 7/2 Vendor item drawing reference Raytheon Company Dba Raytheon Co |
NSN 4820-01-066-9474 is a Valve,vacuum Breaking, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-066-9474: Flow Control Device: CONE; First End Thread Direction: RIGHT-HAND; Body Style: SINGLE CONNECTION, STRAIGHT FLOW; First End Style Designator: PLAIN. 14 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.