The Seat,valve, cataloged under National Stock Number 4820-00-993-5890, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is General Electric Company. Government technical data includes 14 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-993-5890 |
| Primary Part Number | 101B209RA |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | General Electric Company |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN |
| Flange Diameter | 2.281 INCHES NOMINAL IN |
| FSC Application Data | STEAM TURBINE,ELECTRIC GENERATION |
| Body Outside Diameter | 1.936 INCHES MINIMUM AND 1.937 INCHES MAXIMUM IN |
| Taper Minor Diameter | 1.250 INCHES NOMINAL IN |
| Material Document and Classification | MIL-R-17131,TYPE-MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | MIL-S-18410 CLASS B,COND A MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Taper Major Diameter | 1.562 INCHES NOMINAL IN |
| Taper Length | 0.428 INCHES NOMINAL IN |
| Under Flange Height | 0.750 INCHES NOMINAL IN |
| Material | STEEL BODY |
| Material | COBALT ALLOY SEAT |
| Seat Angle in Deg | 20.000 NOMINAL |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| 101B209RA | General Electric Company (USA) |
| Reference | Meaning |
|---|---|
| 101B209RA | 3/9 Design control — primary reference General Electric Co Naval and Drive Turbine Systems Dept |
NSN 4820-00-993-5890 is a Seat,valve, manufactured by General Electric Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-993-5890 has 1 manufacturer part number on file: 101B209RA (General Electric Company).
Key specifications for 101B209RA: Flange Seat to Disk End Height: 0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN; Flange Diameter: 2.281 INCHES NOMINAL IN; FSC Application Data: STEAM TURBINE,ELECTRIC GENERATION; Body Outside Diameter: 1.936 INCHES MINIMUM AND 1.937 INCHES MAXIMUM IN. 14 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.