The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-185-9439, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-185-9439 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | PISTON, SPRING LOADED |
| First End Thread Series Designator | UNS |
| First End Thread Direction | RIGHT-HAND |
| Temp Rating | 600.0 FAHRENHEIT DEGF |
| Second End Relationship with First End | IDENTICAL |
| First End Thread Pitch Diameters | +1.2584 TO 1.2659 INCHES IN |
| Body Style | STRAIGHT THRU |
| First End Thread Class | 3B |
| First End Style Designator | GASKET SEAL |
| End Connection Quantity | 2 |
| Temp Control Device Type | THERMOSTATIC |
| First End Connection Type | THREADED INTERNAL BOSS |
| Temp Adjustability | NOT ADJUSTABLE |
| Material | STEEL BODY |
| Material | STEEL OVERALL |
| Valve Discharge Flow Rate | 12.0 GALLONS PER MINUTE |
| First End Nominal Thread Size | 1.3125 INCHES IN |
| Adjustable Pressure Range | 1400.0 TO 1800.0 CAMERA MOUNT |
| 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 |
|---|---|
| 1703-17 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-185-9439 is a Valve,relief,pressure and Temper, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-193-9113. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-185-9439: Flow Control Device: PISTON, SPRING LOADED; First End Thread Series Designator: UNS; First End Thread Direction: RIGHT-HAND; Temp Rating: 600.0 FAHRENHEIT DEGF. 18 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.