The Valve,safety Relief, cataloged under National Stock Number 4820-00-287-4264, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 27 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 14 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-287-4264 |
| Primary Part Number | 319-4900-1188487PCV904 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Renewable Seat Ring Type | RETAINING SCREW |
| Nominal Pipe Size Accommodated | 0.500 INCHES SECOND END IN |
| Nominal Pipe Size Accommodated | 0.500 INCHES FIRST END IN |
| Connection Style | PLAIN,OPTIONAL END(PIPE) FIRST END |
| Connection Style | PLAIN (PIPE) SECOND END |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Connection Type | THREADED EXTERNAL PIPE SECOND END |
| Style Designator | ANGLE |
| Operating Pressure | 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Features Provided | VALVE STEM LOCK SHIELD AND PRESSURE TIGHT OUTLET SIDE |
| Bonnet Type | EXPOSED SPRING |
| Thread Direction | RIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.500 INCHES SECOND END IN |
| Nominal Thread Size | 0.500 INCHES FIRST END IN |
| Maximum Operating Temp | 550.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | THREADED |
| Media for Which Designed | STEAM SINGLE RESPONSE |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY SEAT |
| Thread Series Designator | NPT SECOND END |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 250.0 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AUTOMATIC OR MANUAL |
| 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 |
|---|---|
| 319-4900-1188487PCV904 PRIMARY | Naval Sea Systems Command (USA) |
| 533115PCV782 PRIMARY | Naval Sea Systems Command (USA) |
| 214-4900-799254PCV780 PRIMARY | Naval Sea Systems Command (USA) |
| 271-4900-957265PCV780 PRIMARY | Naval Sea Systems Command (USA) |
| 389588PCV780 PRIMARY | Naval Sea Systems Command (USA) |
| 571-3801-1302581PCV3 PRIMARY | Naval Sea Systems Command (USA) |
| 346-4900-484711PCV782 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 3664-33PCV3 | 3/2 Design control — primary reference U.S. Government activity |
| 214-4900-799254PCV780 | 5/9 Secondary reference U.S. Government activity |
| 389588PCV780 | 5/9 Secondary reference U.S. Government activity |
| 2476-16PCV782 | 5/9 Secondary reference U.S. Government activity |
| 3376-12PCV904 | 5/9 Secondary reference U.S. Government activity |
| 533115PCV782 | 5/9 Secondary reference U.S. Government activity |
| 2776-23PCV782 | 5/9 Secondary reference U.S. Government activity |
| 319-4900-1188487PCV904 | 5/9 Secondary reference U.S. Government activity |
| 346-4900-484711PCV782 | 5/9 Secondary reference U.S. Government activity |
| 571-3801-1302581PCV3 | 5/9 Secondary reference U.S. Government activity |
| 271-4900-957265PCV780 | 5/9 Secondary reference U.S. Government activity |
| 2076-16PCV780 | 5/9 Secondary reference U.S. Government activity |
| 44-1-2-176-250 | 5/9 Secondary reference Lunkenheimer Co |
| 340-4900-1000937PVC5 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-287-4264 is a Valve,safety Relief, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-287-4264 has 7 manufacturer part numbers on file: 319-4900-1188487PCV904 (Naval Sea Systems Command), 533115PCV782 (Naval Sea Systems Command), 214-4900-799254PCV780 (Naval Sea Systems Command), 271-4900-957265PCV780 (Naval Sea Systems Command), 389588PCV780 (Naval Sea Systems Command) and 2 more.
Key specifications for 319-4900-1188487PCV904: Flow Control Device: POPPET; Renewable Seat Ring Type: RETAINING SCREW; Nominal Pipe Size Accommodated: 0.500 INCHES SECOND END IN; Nominal Pipe Size Accommodated: 0.500 INCHES FIRST END IN. 27 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.