The Valve,expansion, cataloged under National Stock Number 4820-01-018-9318, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Catalog Facts
Item Name
Valve,expansion
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Technical Specifications
Parameter
Value
NSN
4820-01-018-9318
Item Name
Valve,expansion
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
⇄Related Items3
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
6240-01-019-0348W68POSSIBLE MATCH
LAMP,INCANDESCENT
Possible match (shared part number)Westron Corporation Dba Westron Lighting
4920-01-263-7762W68POSSIBLE MATCH
HEATER,TEST STAND
Possible match (shared part number)Rockwell Automation, Inc. Dba Rockwell Automation
5120-01-279-3588W-671APOSSIBLE MATCH
WRENCH,BOX AND OPEN END,COMBINAT
Possible match (shared part number)Ampco Partners, Ltd. Dba Ampco Safety Tools
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
W-68
3/2Design control — primary reference
U.S. Government activity
Related Parts
6240-01-019-0348POSSIBLE MATCH
LAMP,INCANDESCENT
W68
4920-01-263-7762POSSIBLE MATCH
HEATER,TEST STAND
W68
5120-01-279-3588POSSIBLE MATCH
WRENCH,BOX AND OPEN END,COMBINAT
W-671A
Frequently Asked Questions
What is NSN 4820-01-018-9318?
NSN 4820-01-018-9318 is a Valve,expansion, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-018-9318?
3 possible matches (shared part number, not a government interchangeability claim): 6240-01-019-0348, 4920-01-263-7762, 5120-01-279-3588. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-018-9318 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.