The Stem,fluid Valve, cataloged under National Stock Number 4820-01-437-8103, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-437-8103
Item Name
Stem,fluid Valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Valve Type for Which Designed
STOP-CHECK
Stem Actuating End Type
THREADED EXTERNALLY
Valve Size for Which Designed
5.500 INCHES IN
Material
NICKEL ALLOY
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 Items6
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-437-8877509-4325672 ASSY 95POSSIBLE MATCH
VALVE ASSEMBLY,MANIFOLD
Possible match (shared part number)Naval Ship Systems Command
4820-01-439-3487509-4325672 ASSY 96POSSIBLE MATCH
VALVE ASSEMBLY,MANIFOLD
Possible match (shared part number)Naval Ship Systems Command
4820-01-532-4698509-4325672 ASSY97POSSIBLE MATCH
VALVE ASSEMBLY,MANIFOLD
Possible match (shared part number)Naval Ship Systems Command
4820-01-535-2388509-4325672(ASSY98)POSSIBLE MATCH
VALVE ASSEMBLY,MANIFOLD
Possible match (shared part number)Naval Ship Systems Command
4820-01-538-0250509-4325672PC5POSSIBLE MATCH
FLANGE,GLAND,VALVE
Possible match (shared part number)Naval Ship Systems Command
4820-01-538-0254509-4325672PC8POSSIBLE MATCH
RETAINER,DISK,VALVE
Possible match (shared part number)Naval Ship Systems Command
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
4325672
D/9Drawing number reference only
U.S. Government activity
509-4325672 PC 13
3/2Design control — primary reference
U.S. Government activity
Related Parts
4820-01-437-8877POSSIBLE MATCH
VALVE ASSEMBLY,MANIFOLD
509-4325672 ASSY 95
4820-01-439-3487POSSIBLE MATCH
VALVE ASSEMBLY,MANIFOLD
509-4325672 ASSY 96
4820-01-532-4698POSSIBLE MATCH
VALVE ASSEMBLY,MANIFOLD
509-4325672 ASSY97
4820-01-535-2388POSSIBLE MATCH
VALVE ASSEMBLY,MANIFOLD
509-4325672(ASSY98)
4820-01-538-0250POSSIBLE MATCH
FLANGE,GLAND,VALVE
509-4325672PC5
4820-01-538-0254POSSIBLE MATCH
RETAINER,DISK,VALVE
509-4325672PC8
Frequently Asked Questions
What is NSN 4820-01-437-8103?
NSN 4820-01-437-8103 is a Stem,fluid Valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-437-8103?
6 possible matches (shared part number, not a government interchangeability claim): 4820-01-437-8877, 4820-01-439-3487, 4820-01-532-4698. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-437-8103?
Key specifications for 4820-01-437-8103: Valve Type for Which Designed: STOP-CHECK; Stem Actuating End Type: THREADED EXTERNALLY; Valve Size for Which Designed: 5.500 INCHES IN; End Item Identification: NIMITZ CLASS CVN. 4 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-437-8103 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.