The Valve,safety Relief, cataloged under National Stock Number 4820-01-434-5491, 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 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-434-5491 |
| Primary Part Number | 6Q8 JOS-15-C 2T9PSI |
| 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 |
| Furnished Items and Quantity | 1 LEVER |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Bolt Circle Nominal Diameter | 11.750 INCHES FIRST END IN |
| Bolt Circle Nominal Diameter | 9.500 INCHES SECOND END IN |
| Minimum Operating Temp | -20.0 FAHRENHEIT DEGF |
| Connection Type | FLANGE SECOND END |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.875 INCHES FIRST END IN |
| Bolt Hole Nominal Diameter | 0.875 INCHES SECOND END IN |
| Valve Size | 8.000 INCHES IN |
| Adjustable Pressure Range | +2.0 TO 9.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SPRING |
| Maximum Operating Temp | 450.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Second Connection Face to Centerline Distance | 9.500 INCHES IN |
| Nominal Outside Diameter | 11.000 INCHES SECOND END IN |
| Nominal Outside Diameter | 13.500 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 8 SECOND END |
| Bolt Hole Quantity | 8 FIRST END |
| Bonnet Attachment Method | BOLTED |
| First Connection Face to Centerline Distance | 9.438 INCHES IN |
| Material | STEEL BODY |
| Material | STEEL COMP 316 SEAT |
| Material | STEEL COMP 316 STEM |
| 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 |
|---|---|
| 6Q8 JOS-15-C 2T9PSI PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| DS-G-63177-4 ASSY 61576028 | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| 61576028 PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
NSN 4820-01-434-5491 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 4820-01-434-5491 has 3 manufacturer part numbers on file: 6Q8 JOS-15-C 2T9PSI (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), DS-G-63177-4 ASSY 61576028 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 61576028 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
Key specifications for 6Q8 JOS-15-C 2T9PSI: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES FIRST END; Flange Shape: ROUND WITH HOLES SECOND END; Furnished Items and Quantity: 1 LEVER. 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.