The Valve,safety Relief, cataloged under National Stock Number 4820-01-494-2037, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-494-2037 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Furnished Items and Quantity | 1 SPRING |
| Connection Style | GASKET SEAL (TUBE) ALL ENDS |
| Minimum Operating Temp | -20.0 FAHRENHEIT DEGF |
| Connection Type | THREADED EXTERNAL HOSE ALL ENDS |
| Style Designator | ANGLE |
| Material Document and Classification | MIL-B-24480 MIL SPEC 1ST MATERIAL RESPONSE BODY |
| Operating Pressure | 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.7500 INCHES SECOND END IN |
| Nominal Thread Size | 2.7500 INCHES FIRST END IN |
| Maximum Operating Temp | 225.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | THREADED |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Material | COPPER ALLOY 957 OR COPPER ALLOY 958 BODY |
| Thread Series Designator | UN ALL ENDS |
| Opening Pressure Setting | 3000.0 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 |
|---|---|
| PLC-10680 | D/9 Drawing number reference only U.S. Government activity |
| PLC-10680-3000PSI | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-494-2037 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-494-2037: Flow Control Device: DISK; Furnished Items and Quantity: 1 SPRING; Connection Style: GASKET SEAL (TUBE) ALL ENDS; Minimum Operating Temp: -20.0 FAHRENHEIT DEGF. 19 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.