The Valve,safety Relief, cataloged under National Stock Number 4820-00-439-6931, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Airbus Helicopters Deutschland Gmbh. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-439-6931 |
| Primary Part Number | G-104952 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Airbus Helicopters Deutschland Gmbh |
| Status | ACTIVE |
| Flow Control Device | PISTON |
| Connection Style | GASKET SEAL(BOSS) ALL ENDS |
| Connection Type | THREADED INTERNAL BOSS ALL ENDS |
| Style Designator | STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF SEPARABLE SECTIONS. |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES ALL ENDS IN |
| Operating Pressure | 3300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.437 INCHES ALL ENDS IN |
| Seat Angle | 45.0 DEGREES ALL ENDS |
| Maximum Operating Temp | 160.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Thread Class | 3B ALL ENDS |
| Thread Quantity Per Inch | 20 ALL ENDS |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | ALUMINUM BODY |
| Thread Series Designator | UNF ALL ENDS |
| Opening Pressure Setting | 65.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 2.0 GALLONS 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 |
| Part Number | Manufacturer |
|---|---|
| G-104952 | Airbus Helicopters Deutschland Gmbh (DEU) |
| 104952 | Air Logistics Corporation Dba Air Logistics Corp (USA) |
| Reference | Meaning |
|---|---|
| A80292 | 3/2 Design control — primary reference U.S. Government activity |
| 4-3056-6 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-439-6931 is a Valve,safety Relief, manufactured by Airbus Helicopters Deutschland Gmbh, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-439-6931 has 2 manufacturer part numbers on file: G-104952 (Airbus Helicopters Deutschland Gmbh), 104952 (Air Logistics Corporation Dba Air Logistics Corp).
4 possible matches (shared part number, not a government interchangeability claim): 5360-00-783-4040, 5310-01-017-0550, 5930-01-089-3446. Verify interchangeability with system specifications before substitution.
Key specifications for G-104952: Flow Control Device: PISTON; Connection Style: GASKET SEAL(BOSS) ALL ENDS; Connection Type: THREADED INTERNAL BOSS ALL ENDS; Style Designator: STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF SEPARABLE SECTIONS.. 19 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.