The Seat,valve, cataloged under National Stock Number 4820-00-987-7452, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-987-7452 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.498 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Flange Diameter | 2.5005 INCHES MINIMUM AND 2.5010 INCHES MAXIMUM IN |
| FSC Application Data | TURBINE,STEAM |
| Body Outside Diameter | 1.999 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN |
| Body Stepped Inside Diameter | 0.844 INCHES NOMINAL FIRST STEP IN |
| Body Stepped Inside Diameter | 1.089 INCHES NOMINAL SECOND STEP IN |
| Body Stepped Inside Diameter | 1.500 INCHES NOMINAL THIRD STEP IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | MIL-S-853,CL 3,TY E MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | STELLITE B21B23 MFR REF SINGLE MATERIAL RESPONSE SEAT |
| Seat Radius | 0.250 INCHES MINIMUM AND 0.256 INCHES MAXIMUM IN |
| Under Flange Height | 1.000 INCHES NOMINAL IN |
| Material | STEEL BODY |
| Material | STEEL 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 |
|---|---|
| 101B354AA1 | 3/9 Design control — primary reference General Electric Co Naval and Drive Turbine Systems Dept |
| PL501E458AEPC5 | 5/9 Secondary reference General Electric Company |
| 101B354AA1 | 5/9 Secondary reference General Electric Company |
NSN 4820-00-987-7452 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-987-7452: Flange Seat to Disk End Height: 0.498 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN; Flange Diameter: 2.5005 INCHES MINIMUM AND 2.5010 INCHES MAXIMUM IN; FSC Application Data: TURBINE,STEAM; Body Outside Diameter: 1.999 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN. 15 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.