The Valve,safety Relief, cataloged under National Stock Number 4820-00-402-7320, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 30 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-402-7320 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES FIRST END |
| Flange Shape | ROUND WITH HOLES SECOND END |
| Renewable Seat Ring Type | THREADED OR WELDED |
| Flange Face Design | RAISED STRAIGHT FIRST END |
| Flange Face Design | PLAIN SECOND END |
| Bolt Circle Nominal Diameter | 7.688 INCHES SECOND END IN |
| Bolt Circle Nominal Diameter | 7.750 INCHES FIRST END IN |
| Connection Type | FLANGE SECOND END |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE |
| Bolt Hole Nominal Diameter | 0.812 INCHES SECOND END IN |
| Bolt Hole Nominal Diameter | 1.188 INCHES FIRST END IN |
| Bonnet Type | PACKING RETAINING |
| Nominal Outside Diameter | 9.250 INCHES SECOND END IN |
| Nominal Outside Diameter | 9.250 INCHES FIRST END IN |
| Disk Loading Method | WEIGHT |
| Bolt Hole Quantity | 9 SECOND END |
| Bolt Hole Quantity | 8 FIRST END |
| Material | STEEL BODY |
| Material | STEEL SEAT |
| Material | STEEL FLOW CONTROL DEVICE |
| Raised Face Nominal Diameter | 4.125 INCHES FIRST END IN |
| Opening Pressure Setting | 1375.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 65000.0 POUNDS PER HOUR LBS |
| Valve Operation Method | MANUAL OR AIR |
| Raised Face Nominal Height | 0.250 INCHES FIRST END IN |
| Nominal Thickness | 0.938 INCHES SECOND END IN |
| Nominal Thickness | 1.063 INCHES THIRD END IN |
| Reference Number Differentiating Characteristics | AS DIFFERENTIATED BY THE VALVE DISCHARGE FLOW RATE REQUIREMENT |
| 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 |
|---|---|
| 5VKE72 | 3/1 Design control — primary reference Ashcroft Inc Dba Heise |
| S5103H3210751 | 5/1 Secondary reference U.S. Government activity |
NSN 4820-00-402-7320 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-402-7320: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES FIRST END; Flange Shape: ROUND WITH HOLES SECOND END; Renewable Seat Ring Type: THREADED OR WELDED. 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.