The Valve,expansion, cataloged under National Stock Number 4820-01-493-7740, 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 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-493-7740 |
| Primary Part Number | AAE21/2HAA |
| Item Name | Valve,expansion |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emerson Electric Co Alco Controls Div |
| Status | ACTIVE |
| Valve Equalizer Location | EXTERNAL |
| Body Style | STRAIGHT THRU |
| Face to Face Distance | 3.4844 INCHES NOMINAL IN |
| Refrigeration Capacity in Btu Per Hour | 30.0 |
| End Connection Quantity | 2 |
| Valve Evaporator Temp Range Designation | HIGH |
| Material | STEEL BODY |
| Valve Expansion Control Type | THERMOSTATIC |
| 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 |
|---|---|
| AAE21/2HAA PRIMARY | Emerson Electric Co Alco Controls Div (USA) |
| Reference | Meaning |
|---|---|
| AAE21/2HCA | 5/9 Secondary reference Emerson Electric Co Alco Controls Div |
NSN 4820-01-493-7740 is a Valve,expansion, manufactured by Emerson Electric Co Alco Controls Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-493-7740 has 1 manufacturer part number on file: AAE21/2HAA (Emerson Electric Co Alco Controls Div).
Key specifications for AAE21/2HAA: Valve Equalizer Location: EXTERNAL; Body Style: STRAIGHT THRU; Face to Face Distance: 3.4844 INCHES NOMINAL IN; Refrigeration Capacity in Btu Per Hour: 30.0. 8 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.