The Gear Operator,valve, cataloged under National Stock Number 4820-01-478-9275, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-478-9275 |
| Item Name | Gear Operator,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Valve Type for Which Designed | BALL |
| Features Provided | HANDWHEEL |
| Gear Ratio | 35 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 |
| Reference | Meaning |
|---|---|
| 4558716 ASSY C | 5/2 Secondary reference U.S. Government activity |
| 845-4558716 ASSY C | 5/2 Secondary reference U.S. Government activity |
| 4558716 | D/9 Drawing number reference only U.S. Government activity |
| 2642-343-01 ASSY C | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-478-9275 is a Gear Operator,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-492-5918, 3020-01-492-6468. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-478-9275: Valve Type for Which Designed: BALL; Features Provided: HANDWHEEL; Special Features: GEAR OPERATOR IS PAINTED. IT IS DESIGNED TO WITHSTAND HI-SHOCK AND IS DIRECT TO VALVE MOUNTING TYPE.; Part Name Assigned by Controlling Agency: MANUAL OPERATOR-ASSEMBLY PLANETARY GEAR DRIVE.. 3 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.