The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-00-404-1982, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-404-1982 |
| Primary Part Number | 659209 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Flow Control Device | PISTON, WEIGHTED TYPE |
| Second End Relationship with First End | NOT IDENTICAL |
| Body Style | STRAIGHT THRU |
| First End Style Designator | PLAIN |
| End Connection Quantity | 2 |
| Second End Style Designator | BEADED |
| First End Connection Type | UNTHREADED EXTERNAL TUBE |
| Media for Which Designed | AIR |
| Second End Connection Type | UNTHREADED EXTERNAL TUBE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| 659209 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
NSN 4820-00-404-1982 is a Valve,relief,pressure and Temper, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-404-1982 has 1 manufacturer part number on file: 659209 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 659209: Flow Control Device: PISTON, WEIGHTED TYPE; Second End Relationship with First End: NOT IDENTICAL; Body Style: STRAIGHT THRU; First End Style Designator: PLAIN. 9 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.
NSN 4820-00-404-1982 has DEMIL Code D. Demilitarization may be required before disposal or transfer to non-military entities.
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.