The Valve,safety Relief, cataloged under National Stock Number 4820-00-840-9141, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec. Government technical data includes 16 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 | 4820-00-840-9141 |
| Primary Part Number | RD10280H3 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec |
| Status | ACTIVE |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES FIRST END IN |
| Operating Pressure | 21.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.437 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES FIRST END |
| Disk Loading Method | SPRING |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Thread Quantity Per Inch | 20 FIRST END |
| Material | ALUMINUM ALLOY STEM |
| Material | STEEL SEAT |
| Material | ALUMINUM ALLOY BODY |
| Thread Series Designator | UNF FIRST END |
| Opening Pressure Setting | 20.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 13.9 CUBIC FEET PER MINUTE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| RD10280H3 PRIMARY | Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec (USA) |
NSN 4820-00-840-9141 is a Valve,safety Relief, manufactured by Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-840-9141 has 1 manufacturer part number on file: RD10280H3 (Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec).
Key specifications for RD10280H3: Connection Type: THREADED EXTERNAL TUBE FIRST END; Style Designator: STRAIGHT THRU; Nominal Outside Diameter Tube Accommodated: 0.250 INCHES FIRST END IN; Operating Pressure: 21.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. 16 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 4820-00-840-9141 has DEMIL Code Q. 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.