The Disk,valve, cataloged under National Stock Number 4820-01-435-1929, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dover Resources, Inc. Div Norriseal. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-435-1929 |
| Primary Part Number | 980-0042 REF 2 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dover Resources, Inc. Div Norriseal |
| Status | ACTIVE |
| Pressure Rating | 200.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Temp Rating | 250.0 FAHRENHEIT NOMINAL DEGF |
| Style Designator | BUTTERFLY |
| Media for Which Designed | WATER OR OIL |
| Material | NICKEL ALLOY |
| 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 |
|---|---|
| 980-0042 REF 2 | Dover Resources, Inc. Div Norriseal (USA) |
| 51310B014 | Dover Resources, Inc. Div Norriseal (USA) |
| Reference | Meaning |
|---|---|
| 980-0042 REF 2 | 5/9 Secondary reference U.S. Government activity |
| 51310B014 | 3/9 Design control — primary reference U.S. Government activity |
NSN 4820-01-435-1929 is a Disk,valve, manufactured by Dover Resources, Inc. Div Norriseal, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-435-1929 has 2 manufacturer part numbers on file: 980-0042 REF 2 (Dover Resources, Inc. Div Norriseal), 51310B014 (Dover Resources, Inc. Div Norriseal).
Key specifications for 980-0042 REF 2: Pressure Rating: 200.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Temp Rating: 250.0 FAHRENHEIT NOMINAL DEGF; Style Designator: BUTTERFLY; Special Features: VALVE SIZE 12IN 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.