The Valve,check, cataloged under National Stock Number 4820-00-486-3039, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris. Government technical data includes 26 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-486-3039 |
| Primary Part Number | 6-441-31 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris |
| Status | ACTIVE |
| Flow Control Device | BALLBALL |
| Renewable Seat Ring Type | PRESSED-INPRESSED-IN |
| Nominal Pipe Size Accommodated | 0.375 INCHES SECOND END0.375 INCHES SECOND END IN |
| Connection Style | FLARED (TUBE) FIRST ENDFLARED (TUBE) FIRST END |
| Connection Style | GASKET SEAL (BOSS) SECOND ENDGASKET SEAL (BOSS) SECOND END |
| Mounting Position | HORIZONTAL OR HORIZONTAL OR VERTICALVERTICAL |
| Connection Type | THREADED INTERNAL PIPE SECOND ENDTHREADED INTERNAL PIPE SECOND END |
| Connection Type | THREADED EXTERNAL TUBE FIRST ENDTHREADED EXTERNAL TUBE FIRST END |
| Style Designator | ANGLE |
| Nominal Outside Diameter Tube Accommodated | 0.500 INCHES FIRST END IN |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND SECOND ENDRIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST ENDRIGHT-HAND FIRST END |
| Nominal Thread Size | 0.375 INCHES SECOND END0.375 INCHES SECOND END IN |
| Nominal Thread Size | 0.750 INCHES FIRST END0.750 INCHES FIRST END IN |
| Seat Angle | 30.0 DEGREES FIRST END |
| Disk Loading Method | SPRINGSPRING |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Thread Class | 3A FIRST END3A FIRST END A |
| Thread Quantity Per Inch | 18 FIRST END18 FIRST END |
| Thread Quantity Per Inch | 18 SECOND END18 SECOND END |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | COPPER ALLOY SEATCOPPER ALLOY BODY |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICECOPPER ALLOY SEAT |
| Thread Series Designator | NPT SECOND END |
| Thread Series Designator | NPT SECOND ENDUNF FIRST END |
| 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 |
|---|---|
| 6-441-31 PRIMARY | Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris (USA) |
| Reference | Meaning |
|---|---|
| 6-441-31 | 5/9 Secondary reference U.S. Government activity |
| 407DT8 | 5/9 Secondary reference Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters |
| 6-441-31 | 5/2 Secondary reference U.S. Government activity |
| 6-441-31 | 5/9 Secondary reference Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters |
| 407DT8 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-486-3039 is a Valve,check, manufactured by Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-486-3039 has 1 manufacturer part number on file: 6-441-31 (Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris).
1 possible match (shared part number, not a government interchangeability claim): 2840-00-487-7732. Verify interchangeability with system specifications before substitution.
Key specifications for 6-441-31: Flow Control Device: BALLBALL; Renewable Seat Ring Type: PRESSED-INPRESSED-IN; Nominal Pipe Size Accommodated: 0.375 INCHES SECOND END0.375 INCHES SECOND END IN; Connection Style: FLARED (TUBE) FIRST ENDFLARED (TUBE) FIRST END. 26 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.