The Valve,safety Relief, cataloged under National Stock Number 4820-01-121-6314, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-121-6314 |
| 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 Face Design | RAISED STRAIGHT FIRST END |
| Connection Style | PLAIN,OPTIONAL END(PIPE) SECOND END |
| Bolt Circle Nominal Diameter | 2.883 INCHES FIRST END IN |
| Connection Type | THREADED INTERNAL PIPE SECOND END |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE |
| Bolt Hole Nominal Diameter | 0.405 INCHES FIRST END IN |
| Thread Direction | RIGHT-HAND SECOND END |
| Nominal Thread Size | 1.500 INCHES SECOND END IN |
| Nominal Outside Diameter | 3.487 INCHES FIRST END IN |
| Bolt Hole Quantity | 4 FIRST END |
| Material | STEEL CORROSION RESISTING BODY |
| Thread Series Designator | NPT SECOND END |
| Raised Face Nominal Diameter | 1.880 INCHES FIRST END IN |
| Opening Pressure Setting | 60.0 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.450 INCHES FIRST END IN |
| Nominal Thickness | 0.384 INCHES FIRST END IN |
| 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 |
|---|---|
| V3D10109-06 | 3/2 Design control — primary reference U.S. Government activity |
| V3D10109 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-121-6314 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-135-7923, 4820-01-156-0522, 4820-01-182-0779. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-121-6314: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES FIRST END; Flange Face Design: RAISED STRAIGHT FIRST END; Connection Style: PLAIN,OPTIONAL END(PIPE) SECOND END. 20 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.