The Disk,valve, cataloged under National Stock Number 4820-01-220-9386, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is The Walworth Company. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-220-9386 |
| Primary Part Number | 9551-5-1Y6 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | The Walworth Company |
| Status | ACTIVE |
| Pressure Rating | 1500.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Temp Rating | 975.0 FAHRENHEIT NOMINAL DEGF |
| Taper Minor Diameter | 1.631 INCHES MINIMUM AND 1.635 INCHES MAXIMUM IN |
| Style Designator | SOLID WEDGE |
| Taper Major Diameter | 2.121 INCHES MINIMUM AND 2.125 INCHES MAXIMUM IN |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Taper Length | 2.812 INCHES NOMINAL IN |
| Material | STEEL |
| 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 |
|---|---|
| 9551-5-1Y6 PRIMARY | The Walworth Company (USA) |
| N10700 PIECE 7A | The Walworth Company (USA) |
| Reference | Meaning |
|---|---|
| N10700 | D/9 Drawing number reference only The Walworth Company |
NSN 4820-01-220-9386 is a Disk,valve, manufactured by The Walworth Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-220-9386 has 2 manufacturer part numbers on file: 9551-5-1Y6 (The Walworth Company), N10700 PIECE 7A (The Walworth Company).
6 possible matches (shared part number, not a government interchangeability claim): 4820-01-221-2118, 4820-01-221-8873, 4820-01-222-8805. Verify interchangeability with system specifications before substitution.
Key specifications for 9551-5-1Y6: Overall Height: 4.125 INCHES NOMINAL IN; Pressure Rating: 1500.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Temp Rating: 975.0 FAHRENHEIT NOMINAL DEGF; Taper Minor Diameter: 1.631 INCHES MINIMUM AND 1.635 INCHES MAXIMUM 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.