The Valve,safety Relief, cataloged under National Stock Number 4820-01-321-5359, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Siemens Energy, Inc. Dba Dresser-Rand. Government technical data includes 8 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-321-5359 |
| Primary Part Number | 11282639 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Siemens Energy, Inc. Dba Dresser-Rand |
| Status | ACTIVE |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Operating Pressure | 3600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.438 INCHES FIRST END IN |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Thread Class | 3A FIRST END A |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END |
| 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 |
|---|---|
| 6309908-124 | Naval Sea Systems Command (USA) |
| 11282639 PRIMARY | Siemens Energy, Inc. Dba Dresser-Rand (USA) |
| Reference | Meaning |
|---|---|
| 11282639 | 5/9 Secondary reference U.S. Government activity |
| 11282639 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| 6309908-124 | 5/9 Secondary reference Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road) |
| 6309908 | 5/9 Secondary reference Naval Sea Systems Command |
NSN 4820-01-321-5359 is a Valve,safety Relief, manufactured by Siemens Energy, Inc. Dba Dresser-Rand, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-321-5359 has 2 manufacturer part numbers on file: 6309908-124 (Naval Sea Systems Command), 11282639 (Siemens Energy, Inc. Dba Dresser-Rand).
5 possible matches (shared part number, not a government interchangeability claim): 4730-01-321-6285, 4710-01-321-6372, 4420-01-322-2141. Verify interchangeability with system specifications before substitution.
Key specifications for 11282639: Connection Type: THREADED EXTERNAL TUBE FIRST END; Operating Pressure: 3600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Thread Direction: RIGHT-HAND FIRST END; Nominal Thread Size: 0.438 INCHES FIRST END IN. 8 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.