The Valve,safety Relief, cataloged under National Stock Number 4820-00-288-6891, 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30 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-00-288-6891 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Flange Shape | ROUND WITH HOLES FIRST END |
| Flange Shape | ROUND WITH HOLES SECOND END |
| Flange Face Design | RAISED STRAIGHT FIRST END |
| Flange Face Design | PLAIN SECOND END |
| Bolt Circle Nominal Diameter | 6.000 INCHES SECOND END IN |
| Bolt Circle Nominal Diameter | 5.000 INCHES FIRST END IN |
| Connection Type | FLANGE SECOND END |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.688 INCHES FIRST END IN |
| Bolt Hole Nominal Diameter | 0.812 INCHES SECOND END IN |
| Valve Size | 2.000 INCHES IN |
| Bonnet Type | INSIDE SPRING |
| Second Connection Face to Centerline Distance | 5.312 INCHES IN |
| Nominal Outside Diameter | 6.500 INCHES FIRST END IN |
| Nominal Outside Diameter | 7.562 INCHES SECOND END IN |
| Bolt Hole Quantity | 8 SECOND END |
| Bolt Hole Quantity | 8 FIRST END |
| Bonnet Attachment Method | THREADED |
| First Connection Face to Centerline Distance | 5.500 INCHES IN |
| Material | STEEL BODY |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING SEAT |
| Material | STEEL CORROSION RESISTING STEM |
| Raised Face Nominal Diameter | 3.625 INCHES FIRST END IN |
| Valve Discharge Flow Rate | 13000.0 POUNDS PER HOUR LBS |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.250 INCHES FIRST END IN |
| Nominal Thickness | 0.812 INCHES SECOND END IN |
| 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 |
|---|---|
| A20684RH | 3/1 Design control — primary reference Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
NSN 4820-00-288-6891 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-288-6891: Flow Control Device: POPPET; Flange Shape: ROUND WITH HOLES FIRST END; Flange Shape: ROUND WITH HOLES SECOND END; Flange Face Design: RAISED STRAIGHT FIRST END. 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.