The Valve,linear,directional Control, cataloged under National Stock Number 4820-01-028-5517, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Kalmar AC 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-028-5517 |
| Primary Part Number | 74773803 |
| Item Name | Valve,linear,directional Control |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Kalmar AC 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 |
NSN 4820-01-028-5517 is a Valve,linear,directional Control, manufactured by Kalmar AC Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-028-5517 has 2 manufacturer part numbers on file: 4773803-4 (Kalmar AC Inc), 74773803 (Kalmar AC Inc).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-566-7330. Verify interchangeability with system specifications before substitution.
Key specifications for 74773803: Special Features: HYDRAULIC FLUID MEDIA,CAST IRON BODY,WITH 7 PORTS,1 INLET W/ THDS 1 1/16-12UN-2B,1 OUTLET W/ THDS 1 5/16-12UN-2B,1 PORT W/ THDS 1 1/16-12UN-2B,2 PORTS W/ THDS 7/16-20UNF-2B,2 PORTS W/ THDS 3/4-16UNF-2B,MAX. WORKING PRESSURE 2000.0 PSI,RELIEF VALVE SET AT 1900 PSI FULL FLOW. 0 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.