The Valve,check, cataloged under National Stock Number 4820-00-954-9668, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Quality Aviation, Inc Dba Quality Aviation Inc. Government technical data includes 26 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-954-9668 |
| Primary Part Number | 2C5790 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Quality Aviation, Inc Dba Quality Aviation Inc |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | DOUBLE THREADED SECTION BOSS FITTING GASKET WITH LOCKNUT SEALING, BOSS SECOND END |
| Connection Style | FLARED (TUBE) FIRST END |
| Supplementary Features | APPL TO AIRCRAFT,TYPE F-4 |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Connection Type | THREADED EXTERNAL BOSS SECOND END |
| Style Designator | ANGLE |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES FIRST END IN |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.562 INCHES SECOND END IN |
| Nominal Thread Size | 0.562 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES FIRST END |
| Disk Loading Method | SPRING |
| Surface Treatment | ANODIZE |
| Media for Which Designed | HYDRAULIC FLUID, PHOSPHATE-ESTER BASE SINGLE RESPONSE |
| Thread Class | 3A FIRST END A |
| Thread Class | 3A SECOND END A |
| Thread Quantity Per Inch | 18 FIRST END |
| Thread Quantity Per Inch | 18 SECOND END |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | ALUMINUM ALLOY 2024 BODY |
| Material | ALUMINUM ALLOY 2024 SEAT |
| Thread Series Designator | UNF FIRST END |
| Thread Series Designator | UNF SECOND 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 |
|---|---|
| 2C5790 | Quality Aviation, Inc Dba Quality Aviation Inc (USA) |
| 2C5790 | United Aeronautical Corporation Dba United Aeronautical Corp (USA) |
| Reference | Meaning |
|---|---|
| 2C5790 | 5/9 Secondary reference Lee Air Company, Inc. |
| 2C5790 | 5/9 Secondary reference Consolidated Aeronautics Corp |
| 2C5790 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-954-9668 is a Valve,check, manufactured by Quality Aviation, Inc Dba Quality Aviation Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-954-9668 has 2 manufacturer part numbers on file: 2C5790 (Quality Aviation, Inc Dba Quality Aviation Inc), 2C5790 (United Aeronautical Corporation Dba United Aeronautical Corp).
Key specifications for 2C5790: Flow Control Device: POPPET; Connection Style: DOUBLE THREADED SECTION BOSS FITTING GASKET WITH LOCKNUT SEALING, BOSS SECOND END; Connection Style: FLARED (TUBE) FIRST END; Supplementary Features: APPL TO AIRCRAFT,TYPE F-4. 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.