The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-327-7794, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is W S Darley & Co. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-327-7794 |
| Primary Part Number | 3803500 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | W S Darley & Co |
| Status | ACTIVE |
| Style Designator | FLAT |
| Material Thickness | 0.062 INCHES NOMINAL IN |
| Bolt Hole Quantity | 4 |
| Bolt Circle Diameter | 2.625 INCHES NOMINAL IN |
| Center Hole Diameter | 0.500 INCHES NOMINAL IN |
| Hole Diameter | 0.312 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 |
NSN 4820-01-327-7794 is a Diaphragm,valve,flat, manufactured by W S Darley & Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-327-7794 has 2 manufacturer part numbers on file: 3803500 (W S Darley & Co), 001784T (Kovatch Corp.).
1 possible match (shared part number, not a government interchangeability claim): 2950-01-386-1566. Verify interchangeability with system specifications before substitution.
Key specifications for 3803500: Style Designator: FLAT; Material Thickness: 0.062 INCHES NOMINAL IN; Bolt Hole Quantity: 4; Bolt Circle Diameter: 2.625 INCHES NOMINAL IN. 6 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.