The Valve,safety Relief, cataloged under National Stock Number 4820-00-052-6569, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-052-6569 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Nominal Outside Diameter Tube Accommodated | 1.000 INCHES ALL ENDS IN |
| Features Provided | PRESSURE TIGHT OUTLET SIDE |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.312 INCHES ALL ENDS IN |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Maximum Operating Temp | 600.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Surface Treatment | PASSIVATE LOCATION NOT OTHERWISE SPECIFIED |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Thread Class | 3A ALL ENDS A |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UN ALL ENDS |
| Opening Pressure Setting | 21.0 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 |
| Reference | Meaning |
|---|---|
| 123SCP127-3 | 7/9 Vendor item drawing reference Northrop Grumman Systems Corporation |
| 16P126 | 5/2 Secondary reference U.S. Government activity |
| 123SCP127-3 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
| 16P126B | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-052-6569 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-052-6569: Flow Control Device: POPPET; Connection Style: FLARED (TUBE) ALL ENDS; Nominal Outside Diameter Tube Accommodated: 1.000 INCHES ALL ENDS IN; Features Provided: PRESSURE TIGHT OUTLET SIDE. 17 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.