NSN 4820-01-231-2781 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-231-2781. Manufacturer of record part number: 9018-001-178 8IN.
The Seat,valve, cataloged under National Stock Number 4820-01-231-2781, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Velan Valve Corp.. Government technical data includes 1 specification, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-231-2781
Primary Part Number
9018-001-178 8IN
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Velan Valve Corp.
Status
ACTIVE
Material
STEEL SEAT
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.
4820-01-231-30989858-011-178 8INPOSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Velan Valve Corp.
4820-01-236-72358188-012-010 8INPOSSIBLE MATCH
RETAINER,GASKET,VALVE
Possible match (shared part number)Velan Valve Corp.
4820-01-464-22279018-016-002-SPOSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)Velan Valve Corp.
4820-01-464-22558958-024-031-SPOSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Velan Valve Corp.
4820-01-486-48458958-024-033-SPOSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Velan Valve Corp.
NSN 4820-01-231-2781 is a Seat,valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-231-2781?
NSN 4820-01-231-2781 has 2 manufacturer part numbers on file: 9018-001-178 8IN (Velan Valve Corp.), 8880-018 ITEM 5B (Velan Valve Corp.).
What NSN replaces 4820-01-231-2781?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-231-3098, 4820-01-236-7235, 4820-01-464-2227. Verify interchangeability with system specifications before substitution.
What are the specifications of 9018-001-178 8IN?
Key specifications for 9018-001-178 8IN: End Item Identification: 7-8 PRESSURE SEAL GATE VALVE; Material: STEEL SEAT. 1 specification is documented in the U.S. Government catalog.
Is NSN 4820-01-231-2781 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.