The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-431-6672, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-431-6672 |
| Primary Part Number | 803-6983468-PC021 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Pressure Rating | 450.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Temp Rating | 165.0 FAHRENHEIT NOMINAL DEGF |
| Outside Diameter | 4.200 INCHES NOMINAL IN |
| Style Designator | FLAT |
| Material Thickness | 0.045 INCHES NOMINAL IN |
| Bolt Hole Quantity | 8 |
| Bolt Circle Diameter | 3.550 INCHES NOMINAL IN |
| Center Hole Diameter | 0.450 INCHES NOMINAL IN |
| Media for Which Designed | WATER, SALT |
| Material | PLASTIC POLYAMIDE NYLON |
| Hole Diameter | 0.330 INCHES NOMINAL IN |
| 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 |
|---|---|
| 6983468-PIECE 21 | Naval Sea Systems Command (USA) |
| 803-6983468-PC021 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6983468 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-431-6672 is a Diaphragm,valve,flat, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-431-6672 has 2 manufacturer part numbers on file: 6983468-PIECE 21 (Naval Sea Systems Command), 803-6983468-PC021 (Naval Sea Systems Command).
Key specifications for 803-6983468-PC021: Pressure Rating: 450.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Temp Rating: 165.0 FAHRENHEIT NOMINAL DEGF; Outside Diameter: 4.200 INCHES NOMINAL IN; Style Designator: FLAT. 11 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.