The Valve,safety Relief, cataloged under National Stock Number 4820-01-419-6491, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 29 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-419-6491 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Furnished Items and Quantity | 1 LEVER |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Bolt Circle Nominal Diameter | 6.000 INCHES FIRST END IN |
| Bolt Circle Nominal Diameter | 4.750 INCHES SECOND END IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.750 INCHES ALL ENDS IN |
| Operating Pressure | 180.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Operating Pressure | 275.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Valve Size | 2.000 INCHES IN |
| Bonnet Type | INSIDE SPRING |
| Specification/standard Data | 81349-MIL-V-24332 GOVERNMENT SPECIFICATION |
| Maximum Operating Temp | 400.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Maximum Operating Temp | 100.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Second Connection Face to Centerline Distance | 5.688 INCHES IN |
| Nondefinitive Spec/std Data | 150 CLASS AND A GRADE |
| Nominal Outside Diameter | 6.000 INCHES SECOND END IN |
| Nominal Outside Diameter | 7.500 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 4 ALL ENDS |
| Bonnet Attachment Method | BOLTED |
| Media for Which Designed | WATER-OIL-GAS SECOND RESPONSE |
| Media for Which Designed | STEAM FIRST RESPONSE |
| First Connection Face to Centerline Distance | 5.500 INCHES IN |
| Material | STEEL COMP 303 STEM |
| Material | STEEL COMP 304 SEAT |
| Material | STEEL COMP 304 FLOW CONTROL DEVICE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| R10AJ5L517-TS1 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| MIL-V-24332 | 5/9 Secondary reference U.S. Government activity |
| R10AJ5L517-TS1 | 5/9 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| MIL-DTL-24332 | 4/1 Identification reference U.S. Government activity |
NSN 4820-01-419-6491 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-419-6491: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Furnished Items and Quantity: 1 LEVER; Flange Face Design: RAISED STRAIGHT ALL ENDS. 29 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.