The Valve,safety Relief, cataloged under National Stock Number 4820-01-511-3956, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Doall Baltimore Company. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-511-3956 |
| Primary Part Number | CMI128379 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Doall Baltimore Company |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 0.250 INCHES ALL ENDS IN |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Nominal Thread Size | 0.250 INCHES ALL ENDS IN |
| Thread Quantity Per Inch | 18 ALL ENDS |
| Thread Series Designator | NPT ALL ENDS |
| Opening Pressure Setting | 90.0 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| CMI128379 PRIMARY | Doall Baltimore Company (USA) |
| Reference | Meaning |
|---|---|
| 091-283796 | 5/9 Secondary reference Doall Baltimore Company |
NSN 4820-01-511-3956 is a Valve,safety Relief, manufactured by Doall Baltimore Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-511-3956 has 1 manufacturer part number on file: CMI128379 (Doall Baltimore Company).
Key specifications for CMI128379: Nominal Pipe Size Accommodated: 0.250 INCHES ALL ENDS IN; Connection Type: THREADED INTERNAL PIPE ALL ENDS; Nominal Thread Size: 0.250 INCHES ALL ENDS IN; End Item Identification: BAND SAW. 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.