The Seat,valve, cataloged under National Stock Number 4820-00-992-9485, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-992-9485 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.500 INCHES NOMINAL IN |
| Flange Diameter | 4.2510 INCHES MINIMUM AND 4.2515 INCHES MAXIMUM IN |
| FSC Application Data | TURBINE,STEAM |
| Body Outside Diameter | 3.747 INCHES MINIMUM AND 3.748 INCHES MAXIMUM IN |
| Body Stepped Inside Diameter | 2.250 INCHES NOMINAL FIRST STEP IN |
| Body Stepped Inside Diameter | 2.680 INCHES NOMINAL SECOND STEP IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | MIL-S-853 MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Seat Radius | 0.672 INCHES MINIMUM AND 0.678 INCHES MAXIMUM IN |
| Under Flange Height | 2.250 INCHES NOMINAL IN |
| Material | STEEL BODY |
| Material | RUBBER SEAT |
| Seating Surface Shape | RADIAL |
| 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 |
|---|---|
| 101C428AA1 | 5/9 Secondary reference General Electric Company |
| 101C428AA1 | 3/9 Design control — primary reference General Electric Co Naval and Drive Turbine Systems Dept |
| 101C428AAPC1 | 5/9 Secondary reference General Electric Co Naval and Drive Turbine Systems Dept |
| 101C428AAPC1 | 5/9 Secondary reference General Electric Company |
NSN 4820-00-992-9485 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-992-9485: Flange Seat to Disk End Height: 0.500 INCHES NOMINAL IN; Flange Diameter: 4.2510 INCHES MINIMUM AND 4.2515 INCHES MAXIMUM IN; FSC Application Data: TURBINE,STEAM; Body Outside Diameter: 3.747 INCHES MINIMUM AND 3.748 INCHES MAXIMUM IN. 13 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.