The Valve,safety Relief, cataloged under National Stock Number 4820-01-508-4080, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-508-4080 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Furnished Items and Quantity | 2 TAILPIECE AND 2 NUT |
| Nominal Pipe Size Accommodated | 1.000 INCHES ALL ENDS IN |
| Connection Style | SOCKET (TUBE) ALL ENDS |
| Minimum Operating Temp | 28.0 FAHRENHEIT DEGF |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | ANGLE |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OR ASTM-A581 OR A582 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5640 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 100.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Bonnet Type | INSIDE SPRING |
| Maximum Operating Temp | 128.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | BOLTED |
| Media for Which Designed | GAS, INERT SINGLE RESPONSE |
| Material | STEEL CORROSION RESISTING OVERALL |
| Opening Pressure Setting | 5.00 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 3.7 CUBIC FEET PER MINUTE |
| 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 |
|---|---|
| 284799-0001 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-508-4080 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-508-4426, 4820-01-508-4711, 4820-01-508-4718. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-508-4080: Flow Control Device: DISK; Furnished Items and Quantity: 2 TAILPIECE AND 2 NUT; Nominal Pipe Size Accommodated: 1.000 INCHES ALL ENDS IN; Connection Style: SOCKET (TUBE) ALL ENDS. 18 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.