The Valve,safety Relief, cataloged under National Stock Number 4820-00-950-5975, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 30 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-950-5975 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES SECOND END |
| Nominal Pipe Size Accommodated | 3.000 INCHES FIRST END IN |
| Flange Face Design | PLAIN SECOND END |
| Connection Style | PLAIN,OPTIONAL END(PIPE) FIRST END |
| Bolt Circle Nominal Diameter | 4.750 INCHES SECOND END IN |
| Connection Type | FLANGE SECOND END |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.750 INCHES SECOND END IN |
| Valve Size | 2.000 INCHES IN |
| Features Provided | VALVE STEM LOCK SHIELD AND PRESSURE TIGHT OUTLET SIDE |
| Bonnet Type | INSIDE SPRING |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 3.000 INCHES FIRST END IN |
| Second Connection Face to Centerline Distance | 2.875 INCHES IN |
| Nominal Outside Diameter | 6.000 INCHES SECOND END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 4 SECOND END |
| Bonnet Attachment Method | THREADED |
| First Connection Face to Centerline Distance | 4.500 INCHES IN |
| Material | COPPER ALLOY BODY |
| Material | COPPER ALLOY FLOW CONTROL DEVICE |
| Material | STEEL STEM |
| Material | COPPER ALLOY SEAT |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 12.0 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AUTOMATIC OR MANUAL |
| Nominal Thickness | 0.500 INCHES SECOND END IN |
| Reference Number Differentiating Characteristics | AS DIFFERENTIATED BY RELIEF PRESSURE RATING,AND SIZE AND TYPE OF END CONNECTIONS |
| 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 |
|---|---|
| 83 | 3/1 Design control — primary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-00-950-5975 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-950-5975: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES SECOND END; Nominal Pipe Size Accommodated: 3.000 INCHES FIRST END IN; Flange Face Design: PLAIN SECOND END. 30 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.