The Seat,valve, cataloged under National Stock Number 4820-01-189-1785, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-01-189-1785
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Material
COPPER ALLOY BODY
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items4
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-240-475131110-1POSSIBLE MATCH
DIAPHRAGM,VALVE,FLAT
Possible match (shared part number)Pneudraulics, Inc.
5305-01-443-2406POSSIBLE MATCH
SCREW,MACHINE
Possible match (shared part number)
5342-01-458-139531110-1POSSIBLE MATCH
MOUNT,RESILIENT,WEAPON SYSTEM
Possible match (shared part number)Hutchinson Aerospace & Industry, Inc. Dba Barry Wright Corp
1670-01-487-077711-1-900-3POSSIBLE MATCH
PARACHUTE,PERSONNEL
Possible match (shared part number)W1d1 Natick Soldier Center Dba Us Army Ccdc Soldier Center Div Combat Capabilities Development Command - Soldier Center
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
2700R ITEM 8
5/9Secondary reference
Oil Capital Valve Company Dba Ocv Control Valves Div Ocv Control Valves, Llc
311101
3/9Design control — primary reference
Oil Capital Valve Company Dba Ocv Control Valves Div Ocv Control Valves, Llc
Related Parts
4820-01-240-4751POSSIBLE MATCH
DIAPHRAGM,VALVE,FLAT
31110-1
5305-01-443-2406POSSIBLE MATCH
SCREW,MACHINE
5342-01-458-1395POSSIBLE MATCH
MOUNT,RESILIENT,WEAPON SYSTEM
31110-1
1670-01-487-0777POSSIBLE MATCH
PARACHUTE,PERSONNEL
11-1-900-3
Frequently Asked Questions
What is NSN 4820-01-189-1785?
NSN 4820-01-189-1785 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-189-1785?
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-240-4751, 5305-01-443-2406, 5342-01-458-1395. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-189-1785?
Key specifications for 4820-01-189-1785: Material: COPPER ALLOY BODY. 1 specification is documented in the U.S. Government catalog.
Is NSN 4820-01-189-1785 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
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.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.