The Valve,expansion, cataloged under National Stock Number 4820-01-441-0494, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Emerson Electric Co Alco Controls Div. Government technical data includes 16 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-441-0494 |
| Primary Part Number | AFA-1/4-MC-1/4X1/2 |
| Item Name | Valve,expansion |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emerson Electric Co Alco Controls Div |
| Status | ACTIVE |
| First End Thread Series Designator | UNIFIED NATIONAL JOINT (UNJ) |
| Valve Equalizer Location | INTERNAL |
| First End Thread Direction | RIGHT-HAND |
| Temp Rating | 250.0 FAHRENHEIT DEGF |
| Second End Relationship with First End | IDENTICAL |
| Body Style | ANGLE GIVE "ADQM" OR "ADQN" IF FLANGED ONE OR TWO ENDS |
| First End Seat Angle in Deg | 37.0 |
| First End Thread Class | 2A A |
| First End Style Designator | FLARED |
| Refrigeration Capacity in Btu Per Hour | 6.0 |
| End Connection Quantity | 2 |
| First End Connection Type | THREADED EXTERNAL TUBE |
| First End Outside Diameter Tube Accommodated | 0.250 INCHES NOMINAL IN |
| Valve Expansion Control Type | THERMOSTATIC |
| Media for Which Designed | REFRIGERANT 12 |
| First End Nominal Thread Size | 0.438 INCHES IN |
| 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 |
|---|---|
| AFA-1/4-MC-1/4X1/2 PRIMARY | Emerson Electric Co Alco Controls Div (USA) |
| Reference | Meaning |
|---|---|
| AFA-1/4-RC | C/1 Advisory reference — outside the item-of-supply concept Emerson Electric Co Alco Controls Div |
| AFA-1/4-MC | C/1 Advisory reference — outside the item-of-supply concept Emerson Electric Co Alco Controls Div |
| AFA-1/4-R134A-1/4X1/2 | 5/9 Secondary reference Emerson Electric Co Alco Controls Div |
NSN 4820-01-441-0494 is a Valve,expansion, manufactured by Emerson Electric Co Alco Controls Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-441-0494 has 1 manufacturer part number on file: AFA-1/4-MC-1/4X1/2 (Emerson Electric Co Alco Controls Div).
Key specifications for AFA-1/4-MC-1/4X1/2: First End Thread Series Designator: UNIFIED NATIONAL JOINT (UNJ); Valve Equalizer Location: INTERNAL; First End Thread Direction: RIGHT-HAND; Temp Rating: 250.0 FAHRENHEIT DEGF. 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.
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.