The Seat,valve, cataloged under National Stock Number 4820-01-061-4855, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Compressor Engineering Corp. Government technical data includes 8 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-061-4855 |
| Primary Part Number | 1R56163 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Compressor Engineering Corp |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.281 INCHES NOMINAL IN |
| Flange Diameter | 2.792 INCHES NOMINAL IN |
| Body Outside Diameter | 2.424 INCHES NOMINAL IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.515 INCHES NOMINAL IN |
| Under Flange Height | 0.378 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 1R56163 | Compressor Engineering Corp (USA) |
| Reference | Meaning |
|---|---|
| R56163 | 3/9 Design control — primary reference Siemens Energy, Inc. Dba Dresser-Rand |
| 1R56163 | 5/9 Secondary reference U.S. Government activity |
| R56163 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| R56163 | 5/9 Secondary reference U.S. Government activity |
| 1R56163 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| 1R56163 | 5/9 Secondary reference Siemens Energy, Inc. Dba Dresser-Rand |
NSN 4820-01-061-4855 is a Seat,valve, manufactured by Compressor Engineering Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-061-4855 has 1 manufacturer part number on file: 1R56163 (Compressor Engineering Corp).
Key specifications for 1R56163: Flange Seat to Disk End Height: 0.281 INCHES NOMINAL IN; Flange Diameter: 2.792 INCHES NOMINAL IN; Body Outside Diameter: 2.424 INCHES NOMINAL IN; Style Designator: PLAIN FLANGED. 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.