The Locking Device Valv, cataloged under National Stock Number 4820-01-509-0770, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-509-0770 |
| Item Name | Locking Device Valv |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Functional Description | USED TO LOCK VALVE HANDLE AND STEM TO PREVENT BEING INADVERTENTLY TURNED |
| Material | NICKEL ALLOY |
| 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 |
|---|---|
| 1889758 | D/9 Drawing number reference only U.S. Government activity |
| 845-1889758ASSY34 | 5/9 Secondary reference Naval Sea Systems Command |
| 845-1889758ASSY34 | 3/2 Design control — primary reference U.S. Government activity |
| 845-1889758ASSY34 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-509-0770 is a Locking Device Valv, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-541-6160, 5340-01-728-2666, 5340-01-728-2993. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-509-0770: Functional Description: USED TO LOCK VALVE HANDLE AND STEM TO PREVENT BEING INADVERTENTLY TURNED; Part Name Assigned by Controlling Agency: LOCK, STEM, LOCKED OPEN; Material: NICKEL ALLOY. 2 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.