The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-01-539-3441, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Mission Systems Orchard Park Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Mission Systems Orchard Park Inc (CAGE 04577); Conax Florida Corporation (CAGE 62323) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-539-3441 |
| Primary Part Number | 4104-005-01 |
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Mission Systems Orchard Park Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| 4104-005-01 PRIMARY | Mission Systems Orchard Park Inc (USA) |
| 4104-005-01 | Conax Florida Corporation (USA) |
| Reference | Meaning |
|---|---|
| 4604-001-03 | D/9 Drawing number reference only Mission Systems Orchard Park Inc |
NSN 4820-01-539-3441 is a Diaphragm,actuator Valve,special, manufactured by Mission Systems Orchard Park Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-539-3441 has 2 manufacturer part numbers on file: 4104-005-01 (Mission Systems Orchard Park Inc), 4104-005-01 (Conax Florida Corporation).
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-539-3489, 4820-01-539-4418. Verify interchangeability with system specifications before substitution.
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.