The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-01-421-6828, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is O. C. Keckley Company. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-421-6828 |
| Primary Part Number | 11/4AAF-AIR |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | O. C. Keckley Company |
| Status | ACTIVE |
| First End Bolt Hole Quantity | 4 |
| Flow Control Device | DISK |
| Second End Relationship with First End | IDENTICAL |
| Body Style | STRAIGHT THRU |
| Face to Face Distance | 6.688 INCHES NOMINAL IN |
| Regulation Type | MANUAL SINGLE STAGE |
| First End Flange Thickness | 0.406 INCHES NOMINAL IN |
| First End Flange Outside Diameter | 4.625 INCHES NOMINAL IN |
| First End Style Designator | PLAIN |
| First End Bolt Hole Diameter | 0.625 INCHES NOMINAL IN |
| First End Bolt Circle Diameter | 3.500 INCHES NOMINAL IN |
| End Connection Quantity | 2 |
| Manual Control Method | WHEEL |
| Valve Loading Method | SPRING |
| First End Connection Type | PLAIN FACE FLANGE |
| First End Flange Shape Style | ROUND W/ BOLT HOLES |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING SEAT |
| Media for Which Designed | AIR |
| Filter | NOT INCLUDED |
| 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 |
|---|---|
| 13687-C | O. C. Keckley Company (USA) |
| 11/4AAF-AIR PRIMARY | O. C. Keckley Company (USA) |
| 11/4AAF-150-AIR | O. C. Keckley Company (USA) |
| 25366A | O. C. Keckley Company (USA) |
NSN 4820-01-421-6828 is a Valve,regulating,fluid Pressure, manufactured by O. C. Keckley Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-421-6828 has 4 manufacturer part numbers on file: 13687-C (O. C. Keckley Company), 11/4AAF-AIR (O. C. Keckley Company), 11/4AAF-150-AIR (O. C. Keckley Company), 25366A (O. C. Keckley Company).
Key specifications for 11/4AAF-AIR: First End Bolt Hole Quantity: 4; Flow Control Device: DISK; Second End Relationship with First End: IDENTICAL; Body Style: STRAIGHT THRU. 20 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.