The Valve,vacuum Breaking, cataloged under National Stock Number 4820-01-198-4201, 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12 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-198-4201 |
| Item Name | Valve,vacuum Breaking |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Second End Relationship with First End | NOT IDENTICAL |
| Body Style | SINGLE CONNECTION, STRAIGHT FLOW |
| Material Document and Classification | STM A582 TY 303 ASSN STD SINGLE MATERIAL RESPONSE |
| End Connection Quantity | 2 |
| Body Material | STEEL COMP 303 |
| Second End Style Designator | PLAIN |
| Second End Flange Shape Style | HEXAGON W/ BOLT HOLES |
| First End Connection Type | THREADED EXTERNAL PIPE |
| First End Nominal Pipe Size Accommodated | 0.250 INCHES IN |
| Second End Connection Type | PLAIN FACE FLANGE |
| Second End Width Across Flats | 0.750 INCHES NOMINAL IN |
| 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 |
|---|---|
| 5189440 | 7/2 Vendor item drawing reference Naval Sea Systems Command |
| P4-262T | 3/2 Design control — primary reference U.S. Government activity |
| 4820PL0977403 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 4820-01-198-4201 is a Valve,vacuum Breaking, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-198-4201: Second End Relationship with First End: NOT IDENTICAL; Body Style: SINGLE CONNECTION, STRAIGHT FLOW; Material Document and Classification: STM A582 TY 303 ASSN STD SINGLE MATERIAL RESPONSE; End Connection Quantity: 2. 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.