The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-01-118-2978, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-118-2978 |
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Outside Diameter | 2.148 INCHES NOMINAL IN |
| Style Designator | SPECIAL SHAPED |
| Material Thickness | 0.030 INCHES NOMINAL IN |
| Material | RUBBER AND ALUMINUM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 2794-1001 | D/9 Drawing number reference only Mission Systems Orchard Park Inc |
| 2794-1020-1 | C/1 Advisory reference — outside the item-of-supply concept Mission Systems Orchard Park Inc |
| 2794-1001 PIECE 3 | 5/9 Secondary reference Mission Systems Orchard Park Inc |
| 2794-1020-1 | 3/9 Design control — primary reference Carleton Technologies Inc Div Tampa Facility |
NSN 4820-01-118-2978 is a Diaphragm,actuator Valve,special, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-135-1338. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-118-2978: Overall Height: 0.134 INCHES NOMINAL IN; Outside Diameter: 2.148 INCHES NOMINAL IN; Style Designator: SPECIAL SHAPED; Material Thickness: 0.030 INCHES NOMINAL IN. 4 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.
NSN 4820-01-118-2978 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.