The Valve,safety Relief, cataloged under National Stock Number 4820-01-399-5689, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-399-5689 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS |
| Minimum Operating Temp | -40.0 CELSIUS DEGC |
| Connection Type | THREADED CARTRIDGE ALL ENDS |
| Style Designator | SCREW-IN CARTRIDGE |
| Adjustable Pressure Range | +7.0 TO 10.0 BAR |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 2.250 INCHES ALL ENDS IN |
| Maximum Operating Temp | 135.0 CELSIUS SINGLE RESPONSE DEGC |
| Thread Class | 3A ALL ENDS A |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Material | STEEL CORROSION RESISTING BODY |
| Thread Series Designator | UN ALL ENDS |
| Valve Discharge Flow Rate | 150.0 LITERS PER MINUTE |
| 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 |
| Reference | Meaning |
|---|---|
| 801-6405539-FN-27-2 | 5/9 Secondary reference Naval Sea Systems Command |
| MIL-DTL-24694/1 | 4/1 Identification reference U.S. Government activity |
| M24694/1-E-IN | 2/2 Government specification standardization U.S. Government activity |
| 211082011 | 5/1 Secondary reference Naval Sea Systems Command |
| 801-6405539-FN-32-2 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4820-01-399-5689 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-429-8415, 4820-01-728-1736. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-399-5689: Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS; Minimum Operating Temp: -40.0 CELSIUS DEGC; Connection Type: THREADED CARTRIDGE ALL ENDS; Style Designator: SCREW-IN CARTRIDGE. 14 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.