NSN 4820-01-490-6572 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-490-6572. Manufacturer of record part number: 566-6985434-4.
Material Document and Classification: QQ-S-763, CLASS 303 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Operating Pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Identification
NSN: 4820-01-490-6572
NIIN: 014906572
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 566-6985434-4
Manufacturer: Naval Sea Systems Command
General Description
The Valve,check, cataloged under National Stock Number 4820-01-490-6572, 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 9 specifications, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-490-6572
Primary Part Number
566-6985434-4
Item Name
Valve,check
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Naval Sea Systems Command
Status
ACTIVE
Flow Control Device
POPPET
Connection Style
GROOVED (PIPE) ALL ENDS
Mounting Position
HORIZONTAL
Connection Type
UNTHREADED CARTRIDGE ALL ENDS
Style Designator
STRAIGHT THRU DROP-IN CARTRIDGE
Material Document and Classification
QQ-S-763, CLASS 303 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Operating Pressure
3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Material
STEEL CORROSION RESISTING OVERALL
Valve Operation Method
AUTOMATIC
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.
3040-01-490-7098H623-0507-10POSSIBLE MATCH
RING,ROD,PISTON
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
3040-01-490-7101H623-0507-9POSSIBLE MATCH
RING,ROD,PISTON
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
3040-01-722-26286985434-5POSSIBLE MATCH
PISTON,LINEAR ACTUATING CYLINDER
Possible match (shared part number)Naval Sea Systems Command
5315-01-733-2593566-6985434-26POSSIBLE MATCH
PIN,STRAIGHT,HEADED
Possible match (shared part number)Naval Sea Systems Command
5315-01-733-3000566-6985434-27POSSIBLE MATCH
PIN,STRAIGHT,HEADED
Possible match (shared part number)Naval Sea Systems Command
5315-01-733-3062566-6985434-62POSSIBLE MATCH
PIN,STRAIGHT,HEADLESS
Possible match (shared part number)Naval Sea Systems Command
NSN 4820-01-490-6572 is a Valve,check, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-490-6572?
NSN 4820-01-490-6572 has 2 manufacturer part numbers on file: 566-6985434-4 (Naval Sea Systems Command), 6985434-4 (Naval Sea Systems Command).
What NSN replaces 4820-01-490-6572?
6 possible matches (shared part number, not a government interchangeability claim): 3040-01-490-7098, 3040-01-490-7101, 3040-01-722-2628. Verify interchangeability with system specifications before substitution.
What are the specifications of 566-6985434-4?
Key specifications for 566-6985434-4: Flow Control Device: POPPET; Connection Style: GROOVED (PIPE) ALL ENDS; Mounting Position: HORIZONTAL; Connection Type: UNTHREADED CARTRIDGE ALL ENDS. 9 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-490-6572 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.