The Valve,safety Relief, cataloged under National Stock Number 4820-00-289-1789, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 30 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-289-1789 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISKDISK |
| Flange Shape | ROUND WITH HOLES SECOND ENDROUND WITH HOLES SECOND END |
| Furnished Items and Quantity | 1 SIGHT GAGE |
| Renewable Seat Ring Type | THREADEDTHREADED |
| Nominal Pipe Size Accommodated | 0.500 INCHES FIRST END0.500 INCHES FIRST END IN |
| Flange Face Design | RAISED STRAIGHT SECOND END |
| Connection Style | PLAIN,OPTIONAL END(PIPE) FIRST ENDPLAIN,OPTIONAL END(PIPE) FIRST END |
| Bolt Circle Nominal Diameter | 2.625 INCHES SECOND END IN |
| Connection Type | THREADED INTERNAL PIPE FIRST ENDTHREADED INTERNAL PIPE FIRST END |
| Connection Type | FLANGE SECOND ENDFLANGE SECOND END |
| Style Designator | ANGLE FLANGED ENDS |
| Material Document and Classification | MIL-S-15083 MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Bolt Hole Nominal Diameter | 0.562 INCHES SECOND END IN |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +91.0 TO 144.0 POUNDS PER SQUARE INCH+91.0 TO 144.0 POUNDS PER SQUARE INCH LBS |
| Features Provided | VALVE STEM LOCK SHIELDVALVE STEM LOCK SHIELD |
| Bonnet Type | EXPOSED SPRINGEXPOSED SPRING |
| Thread Direction | RIGHT-HAND FIRST ENDRIGHT-HAND FIRST END |
| Nominal Thread Size | 0.500 INCHES FIRST END0.500 INCHES FIRST END IN |
| Maximum Operating Temp | 400.0 FAHRENHEIT SINGLE RESPONSE400.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Second Connection Face to Centerline Distance | 1.812 INCHES IN |
| Nondefinitive Spec/std Data | 1 TYPE AND D COMPOSITION |
| Nominal Outside Diameter | 3.750 INCHES SECOND END IN |
| Disk Loading Method | SPRINGSPRING |
| Bolt Hole Quantity | 4 SECOND END4 SECOND END |
| Bonnet Attachment Method | BOLTEDBOLTED |
| Media for Which Designed | STEAM SINGLE RESPONSE |
| First Connection Face to Centerline Distance | 3.750 INCHES IN |
| Thread Quantity Per Inch | 14 FIRST END14 FIRST END |
| Material | STEEL CORROSION RESISTING STEM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MILV20065 | 4/1 Identification reference U.S. Government activity |
| TYPE1512 | 5/9 Secondary reference Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse |
| R6215AM | 3/9 Design control — primary reference Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse |
NSN 4820-00-289-1789 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-289-1789: Flow Control Device: DISKDISK; Flange Shape: ROUND WITH HOLES SECOND ENDROUND WITH HOLES SECOND END; Furnished Items and Quantity: 1 SIGHT GAGE; Renewable Seat Ring Type: THREADEDTHREADED. 30 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.