The Disk,valve, cataloged under National Stock Number 4820-01-355-3438, 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 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-355-3438 |
| Primary Part Number | 51310C393 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dover Resources, Inc. Div Norriseal |
| Status | ACTIVE |
| Pressure Rating | 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| 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 |
|---|---|
| 51310C393 PRIMARY | Dover Resources, Inc. Div Norriseal (USA) |
| 920-221REF 2 PRIMARY | Dover Resources, Inc. Div Norriseal (USA) |
| Reference | Meaning |
|---|---|
| 920-221REF 2 | 5/9 Secondary reference U.S. Government activity |
| 51310C393 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-355-3438 is a Disk,valve, manufactured by Dover Resources, Inc. Div Norriseal, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-355-3438 has 2 manufacturer part numbers on file: 51310C393 (Dover Resources, Inc. Div Norriseal), 920-221REF 2 (Dover Resources, Inc. Div Norriseal).
Key specifications for 51310C393: Pressure Rating: 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; End Item Identification: NORRIS/O BANNON BUTTERFLY VALVE MODEL NO. 285B,SIZE 12.000 IN. IN; Material: NICKEL ALLOY. 2 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.