The Valve,safety Relief, cataloged under National Stock Number 4820-00-337-1210, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Westinghouse Electric Corp. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-337-1210 |
| Primary Part Number | 25J491PC6 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Westinghouse Electric Corp |
| Status | ACTIVE |
| 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 |
|---|---|
| 25J491PC6 PRIMARY | Westinghouse Electric Corp (USA) |
| 1387700 PRIMARY | Westinghouse Electric Corp (USA) |
| 25J492PC6-12 PRIMARY | Westinghouse Electric Corp (USA) |
| 25J641PC197 PRIMARY | Westinghouse Electric Corp (USA) |
| 25J427PC197 PRIMARY | Westinghouse Electric Corp (USA) |
| 25J553PC197 PRIMARY | Westinghouse Electric Corp (USA) |
| Reference | Meaning |
|---|---|
| 25J492PC6-12 | 3/2 Design control — primary reference U.S. Government activity |
| 25J553PC197 | 5/9 Secondary reference Westinghouse Electric Corp Control Business Unit |
| 1387700 | 5/9 Secondary reference Westinghouse Electric Corp Control Business Unit |
| 25J427PC197 | 5/9 Secondary reference Westinghouse Electric Corp Control Business Unit |
| 1387700 | 5/2 Secondary reference U.S. Government activity |
| 1387700 | 5/9 Secondary reference U.S. Government activity |
| 25J427PC197 | 3/2 Design control — primary reference U.S. Government activity |
| 25J491PC6 | 3/2 Design control — primary reference U.S. Government activity |
| 25J491PC6 | 5/9 Secondary reference Westinghouse Electric Corp Control Business Unit |
| 25J641PC197 | 5/9 Secondary reference Westinghouse Electric Corp Control Business Unit |
| 25J492PC6-12 | 5/9 Secondary reference Westinghouse Electric Corp Control Business Unit |
NSN 4820-00-337-1210 is a Valve,safety Relief, manufactured by Westinghouse Electric Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-337-1210 has 6 manufacturer part numbers on file: 25J491PC6 (Westinghouse Electric Corp), 1387700 (Westinghouse Electric Corp), 25J492PC6-12 (Westinghouse Electric Corp), 25J641PC197 (Westinghouse Electric Corp), 25J427PC197 (Westinghouse Electric Corp) and 1 more.
Key specifications for 25J491PC6: Valve Operation Method: AUTOMATIC. 1 specification is 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.