The Inner Valve Unit, cataloged under National Stock Number 4820-01-089-0819, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Fluid Mechanics Valve Company. Government technical data includes 1 specification, 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. 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 | 4820-01-089-0819 |
| Primary Part Number | 1-170-04A7 |
| Item Name | Inner Valve Unit |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Fluid Mechanics Valve Company |
| Status | ACTIVE |
| General Characteristics Item Description | BODY MATL 316 STAINLESS,SEAT MATLKEL-F;USE W/4400 SERIES VALVE (FLUID MECHANICS VALVE CO) |
| 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 |
|---|---|
| 1-170-04A7 PRIMARY | Fluid Mechanics Valve Company (USA) |
NSN 4820-01-089-0819 is a Inner Valve Unit, manufactured by Fluid Mechanics Valve Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-089-0819 has 1 manufacturer part number on file: 1-170-04A7 (Fluid Mechanics Valve Company).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-197-9983. Verify interchangeability with system specifications before substitution.
Key specifications for 1-170-04A7: General Characteristics Item Description: BODY MATL 316 STAINLESS,SEAT MATLKEL-F;USE W/4400 SERIES VALVE (FLUID MECHANICS VALVE CO). 1 specification is 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.