The Valve,check, cataloged under National Stock Number 4820-00-541-2146, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-541-2146 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | PLAIN (TUBE) ALL ENDS |
| Mounting Position | HORIZONTAL |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 1.250 INCHES FIRST END IN |
| Operating Pressure | 60.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.688 INCHES ALL ENDS IN |
| Seat Angle | 45.0 DEGREES ALL ENDS |
| Maximum Operating Temp | 250.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Surface Treatment | ANODIZE |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Thread Class | 3A ALL ENDS A |
| Thread Quantity Per Inch | 18 ALL ENDS |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | ALUMINUM SEAT |
| Material | ALUMINUM BODY |
| Thread Series Designator | UNEF ALL ENDS |
| 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 |
| Reference | Meaning |
|---|---|
| 40C665 | 5/9 Secondary reference Moog Inc Div Moog Inc., Space and Defense - Salt Lake City |
| 40A367 | 5/2 Secondary reference U.S. Government activity |
| 40C665 | 5/9 Secondary reference E-Systems Inc Montek Div Fluid Controls Opns |
| 40A367 | 5/9 Secondary reference Moog Inc Div Moog Inc., Space and Defense - Salt Lake City |
| 40C665 | 3/2 Design control — primary reference U.S. Government activity |
| 634183-1 | 5/2 Secondary reference U.S. Government activity |
| 40A367 | 5/9 Secondary reference E-Systems Inc Montek Div Fluid Controls Opns |
NSN 4820-00-541-2146 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-541-2146: Flow Control Device: DISK; Connection Style: PLAIN (TUBE) ALL ENDS; Mounting Position: HORIZONTAL; Connection Type: THREADED EXTERNAL TUBE ALL ENDS. 21 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.