The Seat,valve, cataloged under National Stock Number 4820-01-178-9685, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-178-9685 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.188 INCHES NOMINAL IN |
| Flange Diameter | 0.937 INCHES NOMINAL IN |
| Body Outside Diameter | 0.828 INCHES NOMINAL IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.500 INCHES NOMINAL IN |
| Under Flange Height | 0.312 INCHES NOMINAL IN |
| Material | NICKEL ALLOY OVERALL |
| 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 |
|---|---|
| 845-2110254 | D/9 Drawing number reference only U.S. Government activity |
| 845-2110254ASSYRF1-2INPC26 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-178-9685 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-178-9685: Flange Seat to Disk End Height: 0.188 INCHES NOMINAL IN; Flange Diameter: 0.937 INCHES NOMINAL IN; Body Outside Diameter: 0.828 INCHES NOMINAL IN; Style Designator: PLAIN FLANGED. 8 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.