The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-00-944-6251, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Triumph Engine Control Systems Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | Triumph Engine Control Systems Llc (CAGE 11599); Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (CAGE 77445) |
| Parameter | Value |
|---|---|
| NSN | 4820-00-944-6251 |
| Primary Part Number | 35A55016 |
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Triumph Engine Control Systems Llc |
| 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 |
NSN 4820-00-944-6251 is a Diaphragm,actuator Valve,special, manufactured by Triumph Engine Control Systems Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-944-6251 has 2 manufacturer part numbers on file: 35A55016 (Triumph Engine Control Systems Llc), 520471 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
2 possible matches (shared part number, not a government interchangeability claim): 5950-01-058-1735, 1680-01-161-4163. 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.