NSN 4820-01-477-9435 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-477-9435. Manufacturer of record part number: 845-728524 ITEM 52.
The Seat,valve, cataloged under National Stock Number 4820-01-477-9435, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-477-9435
Primary Part Number
845-728524 ITEM 52
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Naval Sea Systems Command
Status
ACTIVE
Material
PLASTIC POLYAMIDE NYLON 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 Items8
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-480-3117845-7285244 ITEM 44POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-480-3147POSSIBLE MATCH
VALVE,BALL
Possible match (shared part number)
4820-01-505-0518POSSIBLE MATCH
RETAINER,SEAT,VALVE
Possible match (shared part number)
4820-01-626-2795POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)
4820-01-647-3894845-7285244ITEM65POSSIBLE MATCH
VALVE,STOP-CHECK
Possible match (shared part number)Naval Sea Systems Command
4820-01-698-8374POSSIBLE MATCH
INDICATOR,VALVE OPENING
Possible match (shared part number)
4820-01-721-2582845-7285244 ITEM 103POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-721-2594845-7285244 ITEM 110POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Naval Sea Systems Command
NSN 4820-01-477-9435 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-477-9435?
NSN 4820-01-477-9435 has 1 manufacturer part number on file: 845-728524 ITEM 52 (Naval Sea Systems Command).
What NSN replaces 4820-01-477-9435?
8 possible matches (shared part number, not a government interchangeability claim): 4820-01-480-3117, 4820-01-480-3147, 4820-01-505-0518. Verify interchangeability with system specifications before substitution.
What are the specifications of 845-728524 ITEM 52?
Key specifications for 845-728524 ITEM 52: End Item Identification: AIR BLEED TYPE BALL VALVE ASSEMBLY; Material: PLASTIC POLYAMIDE NYLON BODY. 1 specification is documented in the U.S. Government catalog.
Is NSN 4820-01-477-9435 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.