The Valve,safety Relief, cataloged under National Stock Number 4820-01-141-8847, 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 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-141-8847 |
| Primary Part Number | 20158 475T525PSI |
| 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 FIRST END |
| Flange Shape | ROUND WITH HOLES SECOND END |
| Flange Face Design | RAISED STRAIGHT FIRST END |
| Flange Face Design | PLAIN SECOND END |
| Bolt Circle Nominal Diameter | 11.500 INCHES SECOND END IN |
| Bolt Circle Nominal Diameter | 17.000 INCHES FIRST END IN |
| Connection Type | FLANGE SECOND END |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE FLANGED ENDS |
| Material Document and Classification | AISI 416 ASSN STD SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Bolt Hole Nominal Diameter | 1.250 INCHES FIRST END IN |
| Bolt Hole Nominal Diameter | 1.000 INCHES SECOND END IN |
| Operating Pressure | 600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 10.000 INCHES IN |
| Adjustable Pressure Range | +475.0 TO 525.0 POUNDS PER SQUARE INCH LBS |
| Maximum Operating Temp | 450.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Second Connection Face to Centerline Distance | 9.438 INCHES IN |
| Nominal Outside Diameter | 14.000 INCHES SECOND END IN |
| Nominal Outside Diameter | 20.000 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 12 SECOND END |
| Bolt Hole Quantity | 16 FIRST END |
| First Connection Face to Centerline Distance | 10.500 INCHES IN |
| Material | STEEL BODY |
| Material | STEEL COMP 416 STEM |
| Material | STEEL FLOW CONTROL DEVICE |
| Raised Face Nominal Diameter | 12.750 INCHES FIRST END IN |
| 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 |
|---|---|
| 20158 475T525PSI PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| 5055RA140009 475T525PSI PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| 5055RA140009 475T525PSI | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| 20158 475T525PSI | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-01-141-8847 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 4820-01-141-8847 has 2 manufacturer part numbers on file: 20158 475T525PSI (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 5055RA140009 475T525PSI (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
Key specifications for 20158 475T525PSI: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES FIRST END; Flange Shape: ROUND WITH HOLES SECOND END; Flange Face Design: RAISED STRAIGHT FIRST 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.