The Valve,expansion, cataloged under National Stock Number 4820-01-200-4264, 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 21 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-200-4264 |
| Primary Part Number | TCLN1FZ3/8X1/2ODF102C |
| Item Name | Valve,expansion |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emerson Electric Co Alco Controls Div |
| Status | ACTIVE |
| Flow Control Device | DISK, FLAT |
| Valve Equalizer Location | EXTERNAL |
| Temp Rating | 50.0 FAHRENHEIT DEGF |
| Second End Relationship with First End | NOT IDENTICAL |
| Body Style | ANGLE GIVE "ADQM" OR "ADQN" IF FLANGED ONE OR TWO ENDS |
| First End Style Designator | SOCKET |
| Valve Equalizer Connection Diameter | 0.250 INCHES NOMINAL IN |
| Refrigeration Capacity in Btu Per Hour | 12.0 |
| Material Document and Classification | ASTM B124, ALLOY NO. 2 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| End Connection Quantity | 2 |
| Second End Style Designator | SOCKET |
| First End Connection Type | UNTHREADED INTERNAL TUBE |
| Valve Evaporator Temp Range Designation | LOW |
| First End Outside Diameter Tube Accommodated | 0.375 INCHES NOMINAL IN |
| Material | COPPER ALLOY BODY |
| Valve Expansion Control Type | THERMOSTATIC |
| Media for Which Designed | REFRIGERANT 12 |
| Valve Equalizer Connection Type | SOLDER TUBE |
| Valve Pressure Limiting Device | NOT INCLUDED |
| Second End Connection Type | UNTHREADED INTERNAL TUBE |
| Second End Outside Diameter Tube Accommodated | 0.500 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 |
|---|---|
| TCLN1FZ3/8X1/2ODF102C PRIMARY | Emerson Electric Co Alco Controls Div (USA) |
| Reference | Meaning |
|---|---|
| TCLN100FZA2C | C/1 Advisory reference — outside the item-of-supply concept Emerson Electric Co Alco Controls Div |
| TCLN100FZ2C | C/1 Advisory reference — outside the item-of-supply concept Emerson Electric Co Alco Controls Div |
| F23045 | D/9 Drawing number reference only Emerson Electric Co Alco Controls Div |
| 3119085 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-200-4264 is a Valve,expansion, manufactured by Emerson Electric Co Alco Controls Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-200-4264 has 1 manufacturer part number on file: TCLN1FZ3/8X1/2ODF102C (Emerson Electric Co Alco Controls Div).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-200-8590, 4820-01-220-0873. Verify interchangeability with system specifications before substitution.
Key specifications for TCLN1FZ3/8X1/2ODF102C: Flow Control Device: DISK, FLAT; Valve Equalizer Location: EXTERNAL; Temp Rating: 50.0 FAHRENHEIT DEGF; Second End Relationship with First End: NOT IDENTICAL. 21 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.