The Valve,safety Relief, cataloged under National Stock Number 4820-01-532-0635, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-532-0635 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Operating Pressure | 25.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Thread Series Designator | NPT FIRST END |
| 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 |
|---|---|
| A-4000-144 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-532-0635 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-532-0635: Operating Pressure: 25.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Nominal Thread Size: 0.250 INCHES FIRST END IN; Special Features: SAFETY RELIEF VALVE REPLACEMENT IN AN A-4400 SERIES REFRIGERATED AIR DRYER FOR PNEUMATIC CONTROL SYSTEM AND THE A-4000 SERIES OIL REMOVAL AND PRESSURE REDUCING STATIONS AND AIR COMPRESSOR ACCESSORIES; End Item Identification: HEMP ENDURABLE POWER SYSTEM. 3 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.