The Valve,safety Relief, cataloged under National Stock Number 4820-00-202-8261, 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 30 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-00-202-8261 |
| Primary Part Number | NMP414MDL-LL3120A |
| 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 ALL ENDS |
| Flange Face Design | RAISED STRAIGHT FIRST END |
| Flange Face Design | PLAIN SECOND END |
| Bolt Circle Nominal Diameter | 2.625 INCHES FIRST END IN |
| Bolt Circle Nominal Diameter | 2.437 INCHES SECOND END IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | MIL-S-15083 MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | MIL-S-867 MIL SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Bolt Hole Nominal Diameter | 0.562 INCHES ALL ENDS IN |
| Operating Pressure | 750.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 0.500 INCHES IN |
| Adjustable Pressure Range | +678.0 TO 820.0 POUNDS PER SQUARE INCH LBS |
| Features Provided | PRESSURE TIGHT OUTLET SIDE |
| Bonnet Type | INSIDE SPRING |
| Maximum Operating Temp | 650.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Second Connection Face to Centerline Distance | 3.125 INCHES IN |
| Nominal Outside Diameter | 3.750 INCHES FIRST END IN |
| Nominal Outside Diameter | 3.562 INCHES SECOND END IN |
| Disk Loading Method | SPRING |
| Mounting Facility | BRACKET(S) |
| Bolt Hole Quantity | 3 SECOND END |
| Bolt Hole Quantity | 4 FIRST END |
| Bonnet Attachment Method | UNION |
| Media for Which Designed | WATER-OIL-GAS SECOND RESPONSE |
| Media for Which Designed | STEAM FIRST RESPONSE |
| First Connection Face to Centerline Distance | 3.250 INCHES 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 |
|---|---|
| NMP414MDL-LL3120A PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| NMP414MDL-LL3120A | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| NMP414MDL-LL3120A | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
NSN 4820-00-202-8261 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 4820-00-202-8261 has 1 manufacturer part number on file: NMP414MDL-LL3120A (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
Key specifications for NMP414MDL-LL3120A: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: RAISED STRAIGHT FIRST END; Flange Face Design: PLAIN SECOND 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.