The Valve,expansion, cataloged under National Stock Number 4820-01-280-3103, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Ontic Engineering & Manufacturing, Inc Dba Ontic Us. Government technical data includes 4 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-280-3103 |
| Primary Part Number | 4100520 |
| Item Name | Valve,expansion |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Ontic Engineering & Manufacturing, Inc Dba Ontic Us |
| Status | ACTIVE |
| Supplementary Features | APPL TO LANTIRN |
| End Connection Quantity | 4 |
| Valve Expansion Control Type | PRESSURE |
| Media for Which Designed | REFRIGERANT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 4100520 PRIMARY | Ontic Engineering & Manufacturing, Inc Dba Ontic Us (USA) |
| Reference | Meaning |
|---|---|
| 4100520 | 5/9 Secondary reference Rtx Corporation Div Pratt & Whitney |
| R16-929 | 5/9 Secondary reference U.S. Government activity |
| 5905037 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-280-3103 is a Valve,expansion, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-280-3103 has 1 manufacturer part number on file: 4100520 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us).
Key specifications for 4100520: Supplementary Features: APPL TO LANTIRN; End Connection Quantity: 4; Valve Expansion Control Type: PRESSURE; Media for Which Designed: REFRIGERANT. 4 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.
NSN 4820-01-280-3103 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.