The Disk,valve, cataloged under National Stock Number 4820-01-187-1467, 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-187-1467 |
| Primary Part Number | 7878-7-Y |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | The Walworth Company |
| Status | ACTIVE |
| Temp Rating | 500.0 FAHRENHEIT MAXIMUM DEGF |
| Outside Diameter | 4.813 INCHES NOMINAL IN |
| Nominal Thread Size | 1.750 INCHES IN |
| Inside Diameter | 2.125 INCHES NOMINAL IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 12 |
| Material | STEEL |
| Thread Series Designator | UNS |
| 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 |
|---|---|
| N-1126 PIECE 32 5IN | The Walworth Company (USA) |
| 7878-7-Y PRIMARY | The Walworth Company (USA) |
| Reference | Meaning |
|---|---|
| 7878-7-Y | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 845-1889553 | D/9 Drawing number reference only U.S. Government activity |
| 2620-922X2 | D/9 Drawing number reference only U.S. Government activity |
| N-11264 | D/9 Drawing number reference only The Walworth Company |
| 2620-922X2 PIECE 32 5IN | 3/2 Design control — primary reference U.S. Government activity |
| 845-1889553 PIECE 32 5IN | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-187-1467 is a Disk,valve, manufactured by The Walworth Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-187-1467 has 2 manufacturer part numbers on file: N-1126 PIECE 32 5IN (The Walworth Company), 7878-7-Y (The Walworth Company).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-199-4466, 4820-01-204-8418, 4820-01-390-5471. Verify interchangeability with system specifications before substitution.
Key specifications for 7878-7-Y: Overall Height: 1.969 INCHES NOMINAL IN; Temp Rating: 500.0 FAHRENHEIT MAXIMUM DEGF; Outside Diameter: 4.813 INCHES NOMINAL IN; Nominal Thread Size: 1.750 INCHES 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.