The Valve,safety Relief, cataloged under National Stock Number 4820-01-201-7472, 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 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-201-7472 |
| Primary Part Number | LL3120B 3-4INCH 401T458PSI STEAM |
| 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 | DISKDISK |
| Valve Size | 0.750 INCHES0.750 INCHES IN |
| Adjustable Pressure Range | +401.0 TO 458.0 POUNDS PER SQUARE INCH+401.0 TO 458.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SPRINGINSIDE SPRING |
| Disk Loading Method | SPRINGSPRING |
| Bonnet Attachment Method | UNIONUNION |
| Media for Which Designed | STEAM SINGLE RESPONSE |
| Material | STEEL BODY |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING SEAT |
| Valve Operation Method | AUTOMATICAUTOMATIC |
| 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 |
|---|---|
| NMP-415 LL3120B 3-4INCH STEAM | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| LL3120B 3-4INCH 401T458PSI STEAM PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| NMP-415 LL3120B 3-4INCH STEAM | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| LL3120B 3-4INCH 401T458PSI STEAM | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| LL3120B 3-4INCH | C/1 Advisory reference — outside the item-of-supply concept Kunkle Industries Inc Lonergan Valve Div |
| NMP-415 LL3120B 3-4INCH STEAM | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| LL3120B 3-4INCH 401T458PSI STEAM | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
NSN 4820-01-201-7472 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 4820-01-201-7472 has 2 manufacturer part numbers on file: NMP-415 LL3120B 3-4INCH STEAM (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), LL3120B 3-4INCH 401T458PSI STEAM (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
Key specifications for LL3120B 3-4INCH 401T458PSI STEAM: Flow Control Device: DISKDISK; Valve Size: 0.750 INCHES0.750 INCHES IN; Adjustable Pressure Range: +401.0 TO 458.0 POUNDS PER SQUARE INCH+401.0 TO 458.0 POUNDS PER SQUARE INCH LBS; Bonnet Type: INSIDE SPRINGINSIDE SPRING. 11 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.