The Valve,safety Relief, cataloged under National Stock Number 4820-01-533-4345, 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 18 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-533-4345 |
| Primary Part Number | SW12504R0085 |
| 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 |
| Nominal Pipe Size Accommodated | 1.500 INCHES ALL ENDS IN |
| Connection Style | SOCKET ALL ENDS |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | ANGLE |
| Material Document and Classification | MIL-C-20159 MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-N-281 CL. A OR B FED SPEC SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | QQ-N-281, CL. A OR B FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | QQ-N-288 COMP A FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Maximum Operating Temp | 150.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY STEM |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY SEAT |
| Opening Pressure Setting | 85.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 4.0 GALLONS PER MINUTE |
| Valve Operation Method | AUTOMATIC OR MANUAL |
| 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 |
|---|---|
| SW12504R0085 PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| 17037 | D/9 Drawing number reference only Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| SW125B03R0085/CDS17037 | 5/1 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| SW125B03R0085/CDS17037 | 5/9 Secondary reference Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| SW125 | D/9 Drawing number reference only Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-01-533-4345 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 4820-01-533-4345 has 1 manufacturer part number on file: SW12504R0085 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
2 possible matches (shared part number, not a government interchangeability claim): 6515-01-590-8361, 4820-01-685-8470. Verify interchangeability with system specifications before substitution.
Key specifications for SW12504R0085: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 1.500 INCHES ALL ENDS IN; Connection Style: SOCKET ALL ENDS; Connection Type: UNTHREADED INTERNAL PIPE ALL ENDS. 18 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.