The Valve,safety Relief, cataloged under National Stock Number 4820-01-144-8149, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Anderson Greenwood Lp Dba Anderson Greenwood Crosby. Government technical data includes 5 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-144-8149 |
| Primary Part Number | 203729940SS |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 0.500 INCHES FIRST END IN |
| Nondefinitive Spec/std Data | 0.500 IN. SIZE AND 3450 TO 6875 RANGE IN |
| Disk Loading Method | SPRING |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 203729940SS PRIMARY | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
| Reference | Meaning |
|---|---|
| PRESSURE RANGE 3450 TO 6875 | 5/1 Secondary reference U.S. Government activity |
| MIL-V-22549 | 4/1 Identification reference U.S. Government activity |
| 6000PSI FOR NITROGEN | 5/1 Secondary reference U.S. Government activity |
NSN 4820-01-144-8149 is a Valve,safety Relief, manufactured by Anderson Greenwood Lp Dba Anderson Greenwood Crosby, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-144-8149 has 1 manufacturer part number on file: 203729940SS (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).
Key specifications for 203729940SS: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 0.500 INCHES FIRST END IN; Nondefinitive Spec/std Data: 0.500 IN. SIZE AND 3450 TO 6875 RANGE IN; Disk Loading Method: SPRING. 5 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.