The Valve,safety Relief, cataloged under National Stock Number 4820-00-752-9968, 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 23 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-752-9968 |
| Primary Part Number | E8506N51M |
| 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 |
| Furnished Items and Quantity | 2 NUT |
| Renewable Seat Ring Type | THREADED |
| Nominal Pipe Size Accommodated | 1.500 INCHES FIRST END IN |
| Connection Style | REDUCED SOCKET FIRST END |
| Connection Type | UNTHREADED INTERNAL PIPE FIRST END |
| Style Designator | ANGLE |
| Operating Pressure | 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Operating Pressure | 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Adjustable Pressure Range | +106.0 TO 120.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | EXPOSED SPRING |
| Maximum Operating Temp | 150.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 150.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Nondefinitive Spec/std Data | A1 TYPE AND C CLASS |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | BOLTED |
| Media for Which Designed | AIR FIRST RESPONSE |
| Media for Which Designed | WATER, FRESH SECOND RESPONSE |
| Material | STEEL SEAT |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE FLOW CONTROL DEVICE |
| Material | COPPER ALLOY 922 BODY |
| Material | COPPER ALLOY 462 AND COPPER ALLOY 464 AND COPPER ALLOY 482 STEM |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| E8506N51M PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| 9876-002PCALP175 | 5/1 Secondary reference U.S. Government activity |
| 513-023PCALP175 | 5/1 Secondary reference Huntington Ingalls Incorporated Div Ingalls Shipbuilding |
| MILV20065 | 4/1 Identification reference U.S. Government activity |
| E8506N51M | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| 3324137 | C/1 Advisory reference — outside the item-of-supply concept Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-00-752-9968 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 4820-00-752-9968 has 1 manufacturer part number on file: E8506N51M (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
Key specifications for E8506N51M: Flow Control Device: DISK; Furnished Items and Quantity: 2 NUT; Renewable Seat Ring Type: THREADED; Nominal Pipe Size Accommodated: 1.500 INCHES FIRST END IN. 23 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.