The Orifice Block,valve, cataloged under National Stock Number 4820-01-121-0052, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-121-0052 |
| Item Name | Orifice Block,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| 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 |
|---|---|
| V3D10055 ITEM 2 | 5/2 Secondary reference U.S. Government activity |
| V2C10850-3DA | 3/1 Design control — primary reference U.S. Government activity |
| V3D10055REVF PT V2C10850-3DA | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-121-0052 is a Orifice Block,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-665-7928. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-121-0052: Part Name Assigned by Controlling Agency: BLOCK VALVE. 0 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.