The Valve,check, cataloged under National Stock Number 4820-01-291-0990, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Control Devices, Incorporated. Government technical data includes 9 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-291-0990 |
| Primary Part Number | PA24-0A |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Control Devices, Incorporated |
| Status | ACTIVE |
| Connection Style | PLAIN (PIPE) FIRST END |
| Mounting Position | HORIZONTAL |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | STRAIGHT THRU |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.500 INCHES FIRST END IN |
| Material | COPPER ALLOY BODY |
| Thread Series Designator | NPT FIRST END |
| 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 |
| Part Number | Manufacturer |
|---|---|
| PA24-0A PRIMARY | Control Devices, Incorporated (USA) |
| Reference | Meaning |
|---|---|
| PA 24 | 5/9 Secondary reference Control Devices, Incorporated |
| 8524669 | 5/9 Secondary reference Control Devices, Incorporated |
| 8524669 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 4820-01-291-0990 is a Valve,check, manufactured by Control Devices, Incorporated, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-291-0990 has 1 manufacturer part number on file: PA24-0A (Control Devices, Incorporated).
Key specifications for PA24-0A: Connection Style: PLAIN (PIPE) FIRST END; Mounting Position: HORIZONTAL; Connection Type: THREADED EXTERNAL PIPE FIRST END; Style Designator: STRAIGHT THRU. 9 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 4820-01-291-0990 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.