The Valve,safety Relief, cataloged under National Stock Number 4820-01-710-8933, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Air Liquide Advanced Technologies. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-710-8933 |
| Primary Part Number | W1025631 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Air Liquide Advanced Technologies |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN (PIPE) FIRST END |
| Nominal Length | 1.98 INCHES ALL ENDS IN |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH GAUGE (PSIG) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 0.5 INCHES IN |
| Maximum Operating Temp | 400.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Nominal Outside Diameter | 1.45 INCHES ALL ENDS IN |
| Disk Loading Method | SPRING |
| Material | RUBBER SYNTHETIC O-RING |
| Opening Pressure Setting | 2.0 POUNDS PER SQUARE INCH GAGE LBS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| W1025631 | Air Liquide Advanced Technologies (FRA) |
| Reference | Meaning |
|---|---|
| 532B-4M-2 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-710-8933 is a Valve,safety Relief, manufactured by Air Liquide Advanced Technologies, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-710-8933 has 1 manufacturer part number on file: W1025631 (Air Liquide Advanced Technologies).
Key specifications for W1025631: Flow Control Device: POPPET; Connection Style: PLAIN (PIPE) FIRST END; Nominal Length: 1.98 INCHES ALL ENDS IN; Connection Type: THREADED EXTERNAL PIPE FIRST END. 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.