The Valve,safety Relief, cataloged under National Stock Number 4820-00-852-5446, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Greenfield World Trade Inc Div Greenfield World Trade Inc D/b/a Legion Industries. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-852-5446 |
| Primary Part Number | 440171 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Greenfield World Trade Inc Div Greenfield World Trade Inc D/b/a Legion Industries |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Renewable Seat Ring Type | THREADED |
| Connection Style | PLAIN,OPTIONAL END(PIPE) FIRST END |
| Connection Style | PLAIN (PIPE) SECOND END |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Connection Type | THREADED EXTERNAL PIPE SECOND END |
| Style Designator | ANGLE |
| Features Provided | PRESSURE TIGHT OUTLET SIDE |
| Thread Direction | RIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.750 INCHES SECOND END IN |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Mounting Facility | THREADED FASTENER |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | NPT SECOND END |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 40.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 675.0 POUNDS PER HOUR LBS |
| Valve Operation Method | AUTOMATIC OR MANUAL |
| 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 |
|---|---|
| 440171 PRIMARY | Greenfield World Trade Inc Div Greenfield World Trade Inc D/b/a Legion Industries (USA) |
| 10-301-46-3/4 | Aalberts Integrated Piping Systems Americas, Inc. (USA) |
| Reference | Meaning |
|---|---|
| K3025E | 5/9 Secondary reference Greenfield World Trade Inc Div Greenfield World Trade Inc D/b/a Legion Industries |
| TS116A | 5/9 Secondary reference Greenfield World Trade Inc Div Greenfield World Trade Inc D/b/a Legion Industries |
NSN 4820-00-852-5446 is a Valve,safety Relief, manufactured by Greenfield World Trade Inc Div Greenfield World Trade Inc D/b/a Legion Industries, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-852-5446 has 2 manufacturer part numbers on file: 440171 (Greenfield World Trade Inc Div Greenfield World Trade Inc D/b/a Legion Industries), 10-301-46-3/4 (Aalberts Integrated Piping Systems Americas, Inc.).
Key specifications for 440171: Flow Control Device: DISK; Renewable Seat Ring Type: THREADED; Connection Style: PLAIN,OPTIONAL END(PIPE) FIRST END; Connection Style: PLAIN (PIPE) SECOND END. 20 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.