The Valve,safety Relief, cataloged under National Stock Number 4820-00-446-3238, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 15 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-446-3238 |
| Primary Part Number | AD16S59-057ALT1PC109 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flow Control Device | DIAPHRAGM |
| Nominal Pipe Size Accommodated | 0.500 INCHES ALL ENDS IN |
| Connection Style | PLAIN,OPTIONAL END(PIPE) ALL ENDS |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Style Designator | ANGLE |
| Features Provided | VALVE STEM LOCK SHIELD AND PRESSURE TIGHT OUTLET SIDE |
| Bonnet Type | INSIDE SPRING |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.500 INCHES ALL ENDS IN |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | THREADED |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | NPT ALL ENDS |
| Opening Pressure Setting | 200.0 POUNDS PER SQUARE INCH 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 |
|---|---|
| AD16S59-057ALT1PC109 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| BB55S59-0241ITEM79 | 5/9 Secondary reference U.S. Government activity |
| 5412 | 5/9 Secondary reference Henry Technologies, Inc. |
| BB55S59-0241ITEM79 | 5/9 Secondary reference Naval Sea Systems Command |
| BB61S59-0139ITEM79 | 5/9 Secondary reference U.S. Government activity |
| BB61S59-0139ITEM79 | 5/9 Secondary reference Naval Sea Systems Command |
| AM57S59-120ALT1PC61 | 5/9 Secondary reference U.S. Government activity |
| AD16S59-057ALT1PC109 | 5/9 Secondary reference U.S. Government activity |
| AM57S59-120ALT1PC61 | 5/9 Secondary reference Naval Sea Systems Command |
NSN 4820-00-446-3238 is a Valve,safety Relief, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-446-3238 has 1 manufacturer part number on file: AD16S59-057ALT1PC109 (Naval Sea Systems Command).
Key specifications for AD16S59-057ALT1PC109: Flow Control Device: DIAPHRAGM; Nominal Pipe Size Accommodated: 0.500 INCHES ALL ENDS IN; Connection Style: PLAIN,OPTIONAL END(PIPE) ALL ENDS; Connection Type: THREADED INTERNAL PIPE ALL ENDS. 15 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.