The Valve,safety Relief, cataloged under National Stock Number 4820-00-404-7707, 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30 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-404-7707 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISKDISK |
| Flange Shape | ROUND WITH HOLES FIRST ENDROUND WITH HOLES FIRST END |
| Flange Shape | ROUND WITH HOLES SECOND ENDROUND WITH HOLES SECOND END |
| Renewable Seat Ring Type | THREADEDTHREADED |
| Flange Face Design | RAISED STRAIGHT SECOND END |
| Flange Face Design | RAISED STRAIGHT SECOND ENDRAISED STRAIGHT FIRST END |
| Bolt Circle Nominal Diameter | 4.500 INCHES SECOND END IN |
| Bolt Circle Nominal Diameter | 4.500 INCHES SECOND END5.875 INCHES FIRST END IN |
| Criticality Code Justification | CQCY |
| Connection Type | FLANGE SECOND ENDFLANGE SECOND END |
| Connection Type | FLANGE FIRST ENDFLANGE FIRST END |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.875 INCHES SECOND END IN |
| Bolt Hole Nominal Diameter | 0.875 INCHES SECOND END0.875 INCHES FIRST END IN |
| Operating Pressure | 705.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 1.000 INCHES1.000 INCHES IN |
| Adjustable Pressure Range | +700.0 TO 769.0 POUNDS PER SQUARE INCH+700.0 TO 769.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | EXPOSED SPRINGEXPOSED SPRING |
| Maximum Operating Temp | 850.0 FAHRENHEIT SINGLE RESPONSE850.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Second Connection Face to Centerline Distance | 5.000 INCHES IN |
| Nominal Outside Diameter | 6.125 INCHES SECOND END IN |
| Nominal Outside Diameter | 6.125 INCHES SECOND END7.500 INCHES FIRST END IN |
| Disk Loading Method | SPRINGSPRING |
| Bolt Hole Quantity | 4 SECOND END4 SECOND END |
| Bolt Hole Quantity | 8 FIRST END8 FIRST END |
| Bonnet Attachment Method | BOLTEDBOLTED |
| First Connection Face to Centerline Distance | 4.750 INCHES IN |
| Material | STEEL CORROSION RESISTING STEM |
| Material | STEEL CORROSION RESISTING STEMSTEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICESTEEL CORROSION RESISTING SEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | C |
| Reference | Meaning |
|---|---|
| A49149REVC1 1-2F2 1-2HNPF | 3/1 Design control — primary reference Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
NSN 4820-00-404-7707 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-404-7707: Flow Control Device: DISKDISK; Flange Shape: ROUND WITH HOLES FIRST ENDROUND WITH HOLES FIRST END; Flange Shape: ROUND WITH HOLES SECOND ENDROUND WITH HOLES SECOND END; 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.