The Valve,safety Relief, cataloged under National Stock Number 4820-01-189-3920, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Steris Corporation Dba Steris Applied Sterilization Technololgies. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-189-3920 |
| Primary Part Number | P075421-091 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Steris Corporation Dba Steris Applied Sterilization Technololgies |
| Status | ACTIVE |
| Flow Control Device | DISKDISK |
| Connection Style | PLAIN (PIPE) SECOND END |
| Features Provided | BONNET PACKING AND PRESSURE TIGHT OUTLET SIDE |
| Bonnet Type | INSIDE SPRINGINSIDE SPRING |
| Nominal Thread Size | 0.500 INCHES SECOND END IN |
| Nominal Thread Size | 1.000 INCHES FIRST END IN |
| Disk Loading Method | SPRINGSPRING |
| Bonnet Attachment Method | THREADEDTHREADED |
| Thread Series Designator | NPT SECOND END |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 100.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 423.0 POUNDS PER HOUR423.0 POUNDS PER HOUR 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 |
| Part Number | Manufacturer |
|---|---|
| P075421-091 PRIMARY | Steris Corporation Dba Steris Applied Sterilization Technololgies (USA) |
| Reference | Meaning |
|---|---|
| 75421-091 | 5/9 Secondary reference American Sterilizer Company Dba Amsco Sterility Assurance Products |
NSN 4820-01-189-3920 is a Valve,safety Relief, manufactured by Steris Corporation Dba Steris Applied Sterilization Technololgies, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-189-3920 has 1 manufacturer part number on file: P075421-091 (Steris Corporation Dba Steris Applied Sterilization Technololgies).
Key specifications for P075421-091: Flow Control Device: DISKDISK; Connection Style: PLAIN (PIPE) SECOND END; Features Provided: BONNET PACKING AND PRESSURE TIGHT OUTLET SIDE; Bonnet Type: INSIDE SPRINGINSIDE SPRING. 13 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.