The Seat,valve, cataloged under National Stock Number 4820-00-974-3948, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-974-3948 |
| Primary Part Number | 101B209CYPC1 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | General Electric Company |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.498 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Flange Diameter | 2.501 INCHES NOMINAL IN |
| Body Outside Diameter | 1.963 INCHES MINIMUM AND 1.973 INCHES MAXIMUM IN |
| Taper Minor Diameter | 1.281 INCHES NOMINAL IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | MIL-R-17131,TYPE MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE FACE |
| Material Document and Classification | QQ-S-763,CLASS 410 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Taper Major Diameter | 1.649 INCHES MINIMUM AND 1.655 INCHES MAXIMUM IN |
| Body Inside Diameter | 1.649 INCHES MINIMUM AND 1.655 INCHES MAXIMUM IN |
| Seat Radius | 0.381 INCHES MINIMUM AND 0.387 INCHES MAXIMUM IN |
| Under Flange Height | 1.678 INCHES MINIMUM AND 1.682 INCHES MAXIMUM IN |
| Material | STEEL BODY |
| Material | COBALT ALLOY FACE |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 101B209CYPC1 | General Electric Company (USA) |
| Reference | Meaning |
|---|---|
| 101B209CY | 3/9 Design control — primary reference General Electric Co Naval and Drive Turbine Systems Dept |
| 101B209CY-1 | C/1 Advisory reference — outside the item-of-supply concept General Electric Co Naval and Drive Turbine Systems Dept |
NSN 4820-00-974-3948 is a Seat,valve, manufactured by General Electric Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-974-3948 has 1 manufacturer part number on file: 101B209CYPC1 (General Electric Company).
Key specifications for 101B209CYPC1: Flange Seat to Disk End Height: 0.498 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN; Flange Diameter: 2.501 INCHES NOMINAL IN; Body Outside Diameter: 1.963 INCHES MINIMUM AND 1.973 INCHES MAXIMUM IN; Taper Minor Diameter: 1.281 INCHES NOMINAL 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.