The Valve,safety Relief, cataloged under National Stock Number 4820-00-172-9122, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Emerson Automation Solutions Final Control Us Lp Div Navy Product Team. Government technical data includes 28 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-00-172-9122 |
| Primary Part Number | 57694000 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES FIRST END |
| Flange Shape | ROUND WITH HOLES SECOND END |
| Renewable Seat Ring Type | THREADED |
| Flange Face Design | RAISED STRAIGHT FIRST END |
| Flange Face Design | PLAIN SECOND END |
| Bolt Circle Nominal Diameter | 6.000 INCHES FIRST END IN |
| Bolt Circle Nominal Diameter | 4.875 INCHES SECOND END IN |
| Criticality Code Justification | FEAT |
| Connection Type | FLANGE SECOND END |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 1.125 INCHES SECOND END IN |
| Bolt Hole Nominal Diameter | 0.750 INCHES FIRST END IN |
| Valve Size | 1.500 INCHES IN |
| Features Provided | PRESSURE TIGHT OUTLET SIDE |
| Bonnet Type | EXPOSED SPRING |
| Nominal Outside Diameter | 7.000 INCHES SECOND END IN |
| Nominal Outside Diameter | 7.500 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 4 SECOND END |
| Bolt Hole Quantity | 4 FIRST END |
| Bonnet Attachment Method | BOLTED |
| Raised Face Nominal Diameter | 5.000 INCHES FIRST END IN |
| Opening Pressure Setting | 643.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 18882.0 POUNDS PER HOUR LBS |
| Valve Operation Method | AUTOMATIC OR MANUAL |
| Raised Face Nominal Height | 0.062 INCHES FIRST END IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 57694000 PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| A32934-2 | 5/9 Secondary reference Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
NSN 4820-00-172-9122 is a Valve,safety Relief, manufactured by Emerson Automation Solutions Final Control Us Lp Div Navy Product Team, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-172-9122 has 1 manufacturer part number on file: 57694000 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
Key specifications for 57694000: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES FIRST END; Flange Shape: ROUND WITH HOLES SECOND END; Renewable Seat Ring Type: THREADED. 28 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.