The Disk,valve, cataloged under National Stock Number 4820-00-148-7879, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corporation Div Epd. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-148-7879 |
| Primary Part Number | 1690P |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| Status | ACTIVE |
| Taper Minor Diameter | 1.743 INCHES NOMINAL IN |
| Style Designator | SOLID WEDGE |
| Taper Major Diameter | 2.062 INCHES NOMINAL IN |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Taper Length | 1.812 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 |
|---|---|
| 46958 | Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA) |
| 1690P PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA) |
| S-150694 | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| 46958 | 5/9 Secondary reference U.S. Government activity |
| S-150694 | 5/9 Secondary reference Siemens Energy, Inc. Dba Dresser-Rand |
| 1690P | 3/9 Design control — primary reference U.S. Government activity |
| S-150694 | 5/9 Secondary reference U.S. Government activity |
| S-150694 | 5/9 Secondary reference Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions |
| S-150694 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-148-7879 is a Disk,valve, manufactured by Curtiss-Wright Electro-Mechanical Corporation Div Epd, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-148-7879 has 3 manufacturer part numbers on file: 46958 (Curtiss-Wright Electro-Mechanical Corporation Div Epd), 1690P (Curtiss-Wright Electro-Mechanical Corporation Div Epd), S-150694 (Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions).
1 possible match (shared part number, not a government interchangeability claim): 5365-01-379-1334. Verify interchangeability with system specifications before substitution.
Key specifications for 1690P: Overall Height: 2.562 INCHES NOMINAL IN; Taper Minor Diameter: 1.743 INCHES NOMINAL IN; Style Designator: SOLID WEDGE; Taper Major Diameter: 2.062 INCHES NOMINAL IN. 6 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.