General Characteristics Item Description: THREE-WAY; FOR MANUAL OPERATOR COMPARTMENT PRESURIZATION VALVE
Identification
NSN: 4820-01-085-1837
NIIN: 010851837
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Gear Box,valve, cataloged under National Stock Number 4820-01-085-1837, 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1 specification, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-085-1837
Item Name
Gear Box,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
General Characteristics Item Description
THREE-WAY; FOR MANUAL OPERATOR COMPARTMENT PRESURIZATION VALVE
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 Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-085-18382641-792-04 ITEM 2POSSIBLE MATCH
BODY,GEAR BOX,VALVE
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
3020-01-085-18882641-792-04 ITEM 5POSSIBLE MATCH
GEAR,SPUR
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
5355-01-086-4130845-4687729 ITEM 11POSSIBLE MATCH
POINTER,VALVE
Possible match (shared part number)Naval Ship Systems Command
4820-01-123-16522641-792-04 ITEM 27POSSIBLE MATCH
GEAR BOX
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
3020-01-170-25632641-792-04 ITEM 6POSSIBLE MATCH
GEAR,SPUR
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
845-4687729-0001 ASSY 100
5/2Secondary reference
U.S. Government activity
4687729-0001 ASSY 100
5/9Secondary reference
U.S. Government activity
4687729-0001
5/2Secondary reference
U.S. Government activity
2641-792-04 ITEM 1
3/2Design control — primary reference
U.S. Government activity
845-4687729
D/9Drawing number reference only
U.S. Government activity
Related Parts
4820-01-085-1838POSSIBLE MATCH
BODY,GEAR BOX,VALVE
2641-792-04 ITEM 2
3020-01-085-1888POSSIBLE MATCH
GEAR,SPUR
2641-792-04 ITEM 5
5355-01-086-4130POSSIBLE MATCH
POINTER,VALVE
845-4687729 ITEM 11
4820-01-123-1652POSSIBLE MATCH
GEAR BOX
2641-792-04 ITEM 27
3020-01-170-2563POSSIBLE MATCH
GEAR,SPUR
2641-792-04 ITEM 6
Frequently Asked Questions
What is NSN 4820-01-085-1837?
NSN 4820-01-085-1837 is a Gear Box,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-085-1837?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-085-1838, 3020-01-085-1888, 5355-01-086-4130. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-085-1837?
Key specifications for 4820-01-085-1837: General Characteristics Item Description: THREE-WAY; FOR MANUAL OPERATOR COMPARTMENT PRESURIZATION VALVE. 1 specification is documented in the U.S. Government catalog.
Is NSN 4820-01-085-1837 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.