The Valve,check, cataloged under National Stock Number 4820-01-422-9581, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-422-9581 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN, OPTIONAL END (PIPE) SECOND END |
| Connection Style | PLAIN (TUBE) FIRST END |
| Mounting Position | HORIZONTAL |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Connection Type | THREADED INTERNAL TUBE SECOND END |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 3.062 INCHES SECOND END IN |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 3.062 INCHES ALL ENDS IN |
| Thread Class | 3A FIRST END A |
| Thread Class | 3B SECOND END |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Material | STEEL COMP 304 BODY |
| Thread Series Designator | UN ALL ENDS |
| Valve Operation Method | AUTOMATIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MIL-DTL-24630/1 | 4/1 Identification reference U.S. Government activity |
| 211035509 | 5/9 Secondary reference Naval Sea Systems Command |
| MIL-V-24630/1 | 5/9 Secondary reference U.S. Government activity |
| M24630/1-24 | 2/2 Government specification standardization U.S. Government activity |
| PLC-11440-24 | 5/1 Secondary reference U.S. Government activity |
| PLC-11440 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-422-9581 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-422-9581: Flow Control Device: POPPET; Connection Style: PLAIN, OPTIONAL END (PIPE) SECOND END; Connection Style: PLAIN (TUBE) FIRST END; Mounting Position: HORIZONTAL. 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 4820-01-422-9581 has DEMIL Code B. 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.