The Valve,safety Relief, cataloged under National Stock Number 4820-01-288-3830, 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 19 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-288-3830 |
| Primary Part Number | 20049R51M |
| 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 FIRST END |
| Nominal Pipe Size Accommodated | 0.500 INCHES SECOND END IN |
| Flange Face Design | PLAIN FIRST END |
| Connection Type | UNTHREADED INTERNAL PIPE SECOND END |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE |
| Valve Size | 0.500 INCHES IN |
| Adjustable Pressure Range | +151.0 TO 180.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SCREW |
| Nominal Outside Diameter | 4.000 INCHES FIRST END IN |
| Bonnet Attachment Method | BOLTED |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY SEAT |
| Material | STEEL STEM |
| Valve Operation Method | AUTOMATIC |
| Nominal Thickness | 0.688 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 | X |
| Part Number | Manufacturer |
|---|---|
| BEMJA08SCC | Dante Valve Company (USA) |
| 20049R51M PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| 20049 ASSY 20049R51M | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| BEMJA08SCC | 5/9 Secondary reference Danco Valve Company |
| 20049R51M | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| 20049 ASSY 20049R51M | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-01-288-3830 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 4820-01-288-3830 has 3 manufacturer part numbers on file: BEMJA08SCC (Dante Valve Company), 20049R51M (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 20049 ASSY 20049R51M (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
Key specifications for 20049R51M: Flow Control Device: DISK; Flange Shape: ROUND FIRST END; Nominal Pipe Size Accommodated: 0.500 INCHES SECOND END IN; Flange Face Design: PLAIN FIRST END. 19 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.