The Valve,safety Relief, cataloged under National Stock Number 4820-01-664-7461, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-664-7461 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Minimum Operating Temp | -65.0 FAHRENHEIT DEGF |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Connection Type | THREADED EXTERNAL PIPE SECOND END |
| Style Designator | STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF SEPARABLE SECTIONS. |
| Operating Pressure | 2400.00 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 0.50 INCHES IN |
| Adjustable Pressure Range | +25.0 TO 41.0 POUNDS PER SQUARE INCH LBS |
| Maximum Operating Temp | 300.00 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Face to Face Distance | 4.15 INCHES IN |
| Material | RUBBER ETHYLENE-PROPYLENE CLASS EPM PACKING |
| Material | STEEL COMP 303 BODY |
| Opening Pressure Setting | 35.00 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 |
|---|---|
| 5162T-4MP-35 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-664-7461 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-664-7461: Minimum Operating Temp: -65.0 FAHRENHEIT DEGF; Connection Type: THREADED INTERNAL PIPE FIRST END; Connection Type: THREADED EXTERNAL PIPE SECOND END; Style Designator: STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF SEPARABLE SECTIONS.. 14 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.