The Valve,safety Relief, cataloged under National Stock Number 4820-01-518-5261, 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 Dba Marine Product Team Div Marine Product Team. Government technical data includes 7 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-518-5261 |
| Primary Part Number | 0266-C01-MG0500 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emerson Automation Solutions Final Control Us Lp Dba Marine Product Team Div Marine Product Team |
| Status | ACTIVE |
| Material Document and Classification | MODEL 266 MFR REF ALL MATERIAL RESPONSES OVERALL |
| Operating Pressure | 500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | -320.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 600.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Media for Which Designed | LIQUID SINGLE RESPONSE |
| Material | STEEL COMP 316 OVERALL |
| 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 |
|---|---|
| 0266-C01-MG0500 PRIMARY | Emerson Automation Solutions Final Control Us Lp Dba Marine Product Team Div Marine Product Team (USA) |
| Reference | Meaning |
|---|---|
| 0266-C01-MG-0500 | 3/9 Design control — primary reference Kunkle Industries Inc Lonergan Valve Div |
| 161K0000 REV XV ITEM 63 | 5/9 Secondary reference U.S. Government activity |
| 161K0127 REV XA | 5/9 Secondary reference Drs Environmental Systems Inc |
| 0266-C01-MG0500 | 5/1 Secondary reference Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| 161K0127 REV XA | 7/9 Vendor item drawing reference U.S. Government activity |
| 161K0127 REV XA | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 4820-01-518-5261 is a Valve,safety Relief, manufactured by Emerson Automation Solutions Final Control Us Lp Dba Marine Product Team Div Marine Product Team, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-518-5261 has 1 manufacturer part number on file: 0266-C01-MG0500 (Emerson Automation Solutions Final Control Us Lp Dba Marine Product Team Div Marine Product Team).
Key specifications for 0266-C01-MG0500: Material Document and Classification: MODEL 266 MFR REF ALL MATERIAL RESPONSES OVERALL; Operating Pressure: 500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Maximum Operating Temp: -320.0 FAHRENHEIT FIRST RESPONSE DEGF; Maximum Operating Temp: 600.0 FAHRENHEIT SECOND RESPONSE DEGF. 7 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.