The Valve,safety Relief, cataloged under National Stock Number 4820-01-382-2073, 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 25 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-382-2073 |
| Primary Part Number | 20258-C-41M |
| 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 WITH HOLES FIRST END |
| Nominal Pipe Size Accommodated | 0.500 INCHES SECOND END IN |
| Flange Face Design | PLAIN FIRST END |
| Connection Style | SOCKET WITH BRAZING RING SECOND END |
| Bolt Circle Nominal Diameter | 2.438 INCHES FIRST END IN |
| Connection Type | UNTHREADED INTERNAL PIPE SECOND END |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE |
| Bolt Hole Nominal Diameter | 0.375 INCHES FIRST END IN |
| Adjustable Pressure Range | +15.0 TO 19.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SPRING |
| Specification/standard Data | 81349-MIL-V-20065 GOVERNMENT SPECIFICATION |
| Nondefinitive Spec/std Data | A2 TYPE AND C CLASS |
| Nominal Outside Diameter | 3.562 INCHES FIRST END IN |
| Nominal Outside Diameter | 3.562 INCHES SECOND END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 3 FIRST END |
| Bonnet Attachment Method | INTEGRAL |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY STEM |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY SEAT |
| Valve Operation Method | MANUAL |
| Nominal Thickness | 0.375 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 |
|---|---|
| 20258-C-41M PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| MIL-V-20065 | 4/1 Identification reference U.S. Government activity |
| 20258-C-41M | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-01-382-2073 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 4820-01-382-2073 has 1 manufacturer part number on file: 20258-C-41M (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
Key specifications for 20258-C-41M: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES FIRST END; Nominal Pipe Size Accommodated: 0.500 INCHES SECOND END IN; Flange Face Design: PLAIN FIRST END. 25 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.