The Disk,valve, cataloged under National Stock Number 4820-00-571-5899, 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 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-571-5899 |
| Primary Part Number | NL0994-1 |
| Item Name | Disk,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 |
| Shank Diameter | 2.617 INCHES NOMINAL IN |
| Flange Diameter | 2.625 INCHES NOMINAL IN |
| Inside Depth | 2.875 INCHES NOMINAL IN |
| Style Designator | POPPET |
| Seat Angle | 44.4 DEGREES NOMINAL |
| Inside Diameter | 1.875 INCHES NOMINAL IN |
| Under Flange Height | 0.469 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| NL0994-1 PRIMARY | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| NL994 | 5/9 Secondary reference U.S. Government activity |
| NL-0994-1 | 3/9 Design control — primary reference Dresser-Rand Company |
| NL994-1 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-571-5899 is a Disk,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 4820-00-571-5899 has 1 manufacturer part number on file: NL0994-1 (Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions).
Key specifications for NL0994-1: Shank Diameter: 2.617 INCHES NOMINAL IN; Flange Diameter: 2.625 INCHES NOMINAL IN; Overall Height: 4.531 INCHES NOMINAL IN; Inside Depth: 2.875 INCHES NOMINAL IN. 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.