The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-154-6556, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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,valve,flat |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator (CAGE 09790) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-154-6556 |
| Primary Part Number | 77949 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator |
| 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 |
|---|---|
| 77949 PRIMARY | Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator (USA) |
| Reference | Meaning |
|---|---|
| 77964 ITEM 3 | 5/9 Secondary reference Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator |
| 77964 | D/9 Drawing number reference only Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator |
NSN 4820-01-154-6556 is a Diaphragm,valve,flat, manufactured by Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-154-6556 has 1 manufacturer part number on file: 77949 (Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-154-8079, 4820-01-154-8080. 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.