The Gear Operator,valve, cataloged under National Stock Number 4820-01-199-8021, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Emerson Automation Solutions Final Control Us Lp. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-199-8021 |
| Primary Part Number | 440-819-020-423-044 |
| Item Name | Gear Operator,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emerson Automation Solutions Final Control Us Lp |
| Status | ACTIVE |
| Valve Type for Which Designed | BUTTERFLY |
| Gear Type | WORM |
| Features Provided | HANDWHEEL AND INDICATOR GAGE |
| Valve Size for Which Designed | 2.000 INCHES IN |
| Material | IRON |
| Gear Ratio | 24 TO 1 |
| 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 |
|---|---|
| 440-819-020-423-044 PRIMARY | Emerson Automation Solutions Final Control Us Lp (USA) |
| Reference | Meaning |
|---|---|
| D423-1-2-440 | D/9 Drawing number reference only Emerson Automation Solutions Final Control Us Lp |
| 398-819-020-423 | C/1 Advisory reference — outside the item-of-supply concept Emerson Automation Solutions Final Control Us Lp |
NSN 4820-01-199-8021 is a Gear Operator,valve, manufactured by Emerson Automation Solutions Final Control Us Lp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-199-8021 has 1 manufacturer part number on file: 440-819-020-423-044 (Emerson Automation Solutions Final Control Us Lp).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-477-8619. Verify interchangeability with system specifications before substitution.
Key specifications for 440-819-020-423-044: Valve Type for Which Designed: BUTTERFLY; Gear Type: WORM; Features Provided: HANDWHEEL AND INDICATOR GAGE; Valve Size for Which Designed: 2.000 INCHES IN. 6 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.