The Valve,safety Relief, cataloged under National Stock Number 4820-01-024-8537, 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 28 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-024-8537 |
| Primary Part Number | 2023412941SS |
| 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 AND 2 TAILPIECE |
| Renewable Seat Ring Type | PRESSED-IN |
| Nominal Pipe Size Accommodated | 0.500 INCHES SECOND END IN |
| Nominal Pipe Size Accommodated | 0.750 INCHES FIRST END IN |
| Connection Style | SOCKET ALL ENDS |
| Connection Type | UNTHREADED INTERNAL PIPE FIRST END |
| Connection Type | UNTHREADED INTERNAL PIPE SECOND END |
| Style Designator | ANGLE |
| Material Document and Classification | ASTM B16 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | QQ-C-390,ALLOY D4/D/ FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | AISI 303 ASSN STD SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | FED STD 66,AISI 304/SAE 3034 FED STD SINGLE MATERIAL RESPONSE SEAT |
| Operating Pressure | 440.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Features Provided | PRESSURE TIGHT OUTLET SIDE AND VALVE STEM LOCK SHIELD |
| Bonnet Type | INSIDE SPRING |
| Specification/standard Data | 81349-MIL-V-22549 GOVERNMENT SPECIFICATION |
| Maximum Operating Temp | 165.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | THREADED |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Material | STEEL COMP 303 STEM |
| Material | STEEL COMP 304 SEAT |
| Material | COPPER ALLOY 360 FLOW CONTROL DEVICE |
| Material | COPPER ALLOY 922 BODY |
| Opening Pressure Setting | 300.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 313.0 CUBIC FEET PER MINUTE |
| 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 |
|---|---|
| 2023412941SS PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| 2023413941SS | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| D44UU-10 1/2 X 3/4 IN | C/1 Advisory reference — outside the item-of-supply concept Dante Valve Company |
| 2023412941SS | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| D44UU-10 1/2 IN | 5/9 Secondary reference Danco Valve Company |
| 20234 | D/9 Drawing number reference only Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| MIL-V-22549 | 4/1 Identification reference U.S. Government activity |
| D44UU-10 1/2 IN | C/1 Advisory reference — outside the item-of-supply concept Dante Valve Company |
| D44UU-10 1/2 X 3/4 IN | 5/9 Secondary reference Danco Valve Company |
NSN 4820-01-024-8537 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 4820-01-024-8537 has 1 manufacturer part number on file: 2023412941SS (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
8 possible matches (shared part number, not a government interchangeability claim): 4820-01-141-7795, 4820-01-142-0382, 4820-01-142-5080. Verify interchangeability with system specifications before substitution.
Key specifications for 2023412941SS: Flow Control Device: DISK; Furnished Items and Quantity: 2 NUT AND 2 TAILPIECE; Renewable Seat Ring Type: PRESSED-IN; Nominal Pipe Size Accommodated: 0.500 INCHES SECOND END IN. 28 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.