The Valve,expansion, cataloged under National Stock Number 4820-01-050-9704, 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 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-050-9704 |
| Primary Part Number | HF 1/2FC |
| Item Name | Valve,expansion |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emerson Electric Co Alco Controls Div |
| Status | ACTIVE |
| Flow Control Device | STEM AND INTEGRAL DISK |
| Valve Equalizer Location | INTERNAL |
| Second End Seat Angle in Deg | 37.0 |
| First End Thread Direction | RIGHT-HAND |
| Temp Rating | 300.0 FAHRENHEIT DEGF |
| Second End Relationship with First End | NOT IDENTICAL |
| Second End Thread Class | 2A A |
| Body Style | ANGLE GIVE "ADQN" IF FLANGED ENDS |
| First End Seat Angle in Deg | 37.0 |
| First End Thread Class | 2A A |
| First End Style Designator | FLARED |
| Bulb Length | 3.500 INCHES NOMINAL IN |
| Bulb Diameter | 0.500 INCHES NOMINAL IN |
| Mounting Method | WELL BULB |
| Refrigeration Capacity in Btu Per Hour | 12.0 |
| End Connection Quantity | 2 |
| Second End Thread Direction | RIGHT-HAND |
| Capillary Tube Length | 5.000 INCHES NOMINAL IN |
| Second End Style Designator | FLARED |
| First End Connection Type | THREADED EXTERNAL TUBE |
| Bulb Media Type | TRICHLOROMONOFLUOROMETHANE |
| First End Outside Diameter Tube Accommodated | 0.375 INCHES NOMINAL IN |
| Material | COPPER ALLOY BODY |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING STEM |
| Valve Expansion Control Type | THERMOSTATIC |
| Media for Which Designed | REFRIGERANT 12 |
| Valve Pressure Limiting Device | NOT INCLUDED |
| Second End Connection Type | THREADED EXTERNAL TUBE |
| Second End Outside Diameter Tube Accommodated | 0.250 INCHES NOMINAL 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 |
|---|---|
| HF 1/2FC PRIMARY | Emerson Electric Co Alco Controls Div (USA) |
| Reference | Meaning |
|---|---|
| HC-1/2FC | 5/9 Secondary reference Emerson Electric Co Alco Controls Div |
| HC 1/2FW | 5/9 Secondary reference Alco Corp |
| HC 1/2FW | 5/9 Secondary reference Emerson Electric Co Alco Controls Div |
| HC1-2FN | C/1 Advisory reference — outside the item-of-supply concept Alco Corp |
| HC-1/2FC | 5/9 Secondary reference Tw Metals Llc |
| HC1/2FW | 5/9 Secondary reference Tw Metals Llc |
NSN 4820-01-050-9704 is a Valve,expansion, manufactured by Emerson Electric Co Alco Controls Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-050-9704 has 1 manufacturer part number on file: HF 1/2FC (Emerson Electric Co Alco Controls Div).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-149-8552, 4820-01-159-5876, 4820-01-381-3268. Verify interchangeability with system specifications before substitution.
Key specifications for HF 1/2FC: Flow Control Device: STEM AND INTEGRAL DISK; Valve Equalizer Location: INTERNAL; Second End Seat Angle in Deg: 37.0; First End Thread Direction: RIGHT-HAND. 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.