The Valve,expansion, cataloged under National Stock Number 4820-01-197-8946, 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 30 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-197-8946 |
| Primary Part Number | AFA1/4FC |
| Item Name | Valve,expansion |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emerson Electric Co Alco Controls Div |
| Status | ACTIVE |
| Flow Control Device | DIAPHRAGM |
| First End Thread Series Designator | UNF |
| Valve Equalizer Location | INTERNAL |
| Second End Seat Angle in Deg | 45.0 |
| First End Thread Direction | RIGHT-HAND |
| Temp Rating | 300.0 FAHRENHEIT DEGF |
| Second End Nominal Thread Size | 0.438 INCHES IN |
| Second End Relationship with First End | NOT IDENTICAL |
| Second End Thread Class | 3A A |
| Body Style | ANGLE GIVE "ADQM" OR "ADQN" IF FLANGED ONE OR TWO ENDS |
| First End Seat Angle in Deg | 45.0 |
| First End Thread Class | 3A A |
| First End Style Designator | FLARED |
| Valve Pressure Limiting Device Setting | 00.0 COMPREHENSIVE PROCUREMENT GUIDELINE - VEHICULAR PRODUCTS - REBUILT VEHICULAR PARTS |
| Bulb Length | 2.105 INCHES NOMINAL IN |
| Bulb Diameter | 0.500 INCHES NOMINAL IN |
| Refrigeration Capacity in Btu Per Hour | 3.0 |
| Second End Thread Series Designator | UNF |
| End Connection Quantity | 2 |
| Second End Thread Direction | RIGHT-HAND |
| Capillary Tube Length | 60.000 INCHES NOMINAL IN |
| Second End Style Designator | FLARED |
| First End Connection Type | THREADED EXTERNAL TUBE |
| Valve Evaporator Temp Range Designation | HIGH |
| First End Outside Diameter Tube Accommodated | 0.500 INCHES NOMINAL IN |
| Material | COPPER ALLOY BODY |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Valve Expansion Control Type | THERMOSTATIC |
| Media for Which Designed | REFRIGERANT 12 |
| Valve Pressure Limiting Device | INCLUDED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4820-01-197-8946 is a Valve,expansion, manufactured by Emerson Electric Co Alco Controls Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-197-8946 has 2 manufacturer part numbers on file: AFA1/4FC (Tw Metals Llc), AFA1/4FC (Emerson Electric Co Alco Controls Div).
Key specifications for AFA1/4FC: Flow Control Device: DIAPHRAGM; First End Thread Series Designator: UNF; Valve Equalizer Location: INTERNAL; Second End Seat Angle in Deg: 45.0. 30 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.