The Seat,valve, cataloged under National Stock Number 4820-01-194-4103, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-194-4103 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Body Outside Diameter | 7.317 INCHES MINIMUM AND 7.320 INCHES MAXIMUM IN |
| Hardness Rating | 38.0 ROCKWELL C NOMINAL SEAT |
| Style Designator | PLAIN |
| Material Document and Classification | ASTM-A105 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Body Inside Diameter | 6.310 INCHES NOMINAL IN |
| Material | STEEL SEAT |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 803-2177518 | D/9 Drawing number reference only U.S. Government activity |
| 803-2177518-08XX-04 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-194-4103 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4810-01-389-7508. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-194-4103: Overall Height: 3.027 INCHES MINIMUM AND 3.030 INCHES MAXIMUM IN; Body Outside Diameter: 7.317 INCHES MINIMUM AND 7.320 INCHES MAXIMUM IN; Hardness Rating: 38.0 ROCKWELL C NOMINAL SEAT; Style Designator: PLAIN. 7 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.