The Seat,valve, cataloged under National Stock Number 4820-00-992-0621, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Westinghouse Electric Corp. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-992-0621 |
| Primary Part Number | 935B111-2 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Westinghouse Electric Corp |
| Status | ACTIVE |
| Flange Diameter | 4.042 INCHES MINIMUM AND 4.052 INCHES MAXIMUM IN |
| FSC Application Data | TURBINE,STEAM |
| Material Document and Classification | MIL-R-17131,TYPE MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | QQ-S-763,CL 410,COND T FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Seat Radius | 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN |
| Material | STEEL BODY |
| Material | COBALT ALLOY 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 |
| Part Number | Manufacturer |
|---|---|
| 935B111-2 | Westinghouse Electric Corp (USA) |
| 668J901PC95 | Westinghouse Electric Corp (USA) |
| Reference | Meaning |
|---|---|
| 935B111-2 | 5/9 Secondary reference U.S. Government activity |
| 935B111PC2 | 5/2 Secondary reference U.S. Government activity |
| 935B111PC2 | 5/9 Secondary reference Westinghouse Electric Corp |
| 935B111-2 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-992-0621 is a Seat,valve, manufactured by Westinghouse Electric Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-992-0621 has 2 manufacturer part numbers on file: 935B111-2 (Westinghouse Electric Corp), 668J901PC95 (Westinghouse Electric Corp).
Key specifications for 935B111-2: Flange Diameter: 4.042 INCHES MINIMUM AND 4.052 INCHES MAXIMUM IN; FSC Application Data: TURBINE,STEAM; Material Document and Classification: MIL-R-17131,TYPE MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE SEAT; Material Document and Classification: QQ-S-763,CL 410,COND T FED SPEC SINGLE MATERIAL RESPONSE BODY. 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.