The Seat,valve, cataloged under National Stock Number 4820-01-256-0644, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions. Government technical data includes 5 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-256-0644 |
| Primary Part Number | SET 148 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| Status | ACTIVE |
| Body Outside Diameter | 0.663 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 0.235 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 |
|---|---|
| HL19354 PIECE 243.2 | Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA) |
| SET 148 PRIMARY | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| SET 148 | 5/9 Secondary reference U.S. Government activity |
| SET 148 | 3/9 Design control — primary reference Siemens Energy, Inc. Dba Dresser-Rand |
| SET 148 | 5/9 Secondary reference Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions |
| HL19354 | D/9 Drawing number reference only U.S. Government activity |
| HL19354 PIECE 243.2 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-256-0644 is a Seat,valve, manufactured by Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-256-0644 has 2 manufacturer part numbers on file: HL19354 PIECE 243.2 (Curtiss-Wright Electro-Mechanical Corporation Div Epd), SET 148 (Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions).
Key specifications for SET 148: Overall Height: 0.127 INCHES NOMINAL IN; Body Outside Diameter: 0.663 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 0.235 INCHES NOMINAL IN. 5 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.