The Valve,safety Relief, cataloged under National Stock Number 4820-01-077-7822, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-077-7822 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN (TUBE) ALL ENDS |
| Connection Type | THREADED CARTRIDGE ALL ENDS |
| Style Designator | SCREW-IN CARTRIDGE |
| Adjustable Pressure Range | +500.0 TO 4000.0 POUNDS PER SQUARE INCH LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.125 INCHES ALL ENDS IN |
| Thread Class | 2A ALL ENDS A |
| Thread Quantity Per Inch | 14 ALL ENDS |
| Material | ALUMINUM ALLOY BODY |
| Thread Series Designator | UNS ALL ENDS |
| 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 |
|---|---|
| 520-207 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-077-7822 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 2590-01-599-0064, 2540-01-660-6407. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-077-7822: Flow Control Device: POPPET; Connection Style: PLAIN (TUBE) ALL ENDS; Connection Type: THREADED CARTRIDGE ALL ENDS; Style Designator: SCREW-IN CARTRIDGE. 12 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.