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PartsTable / COMPONENT / 539561 PIECE 3
539561 PIECE 3 ✓ Verified by PartsTable
— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

The DISK,VALVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, overall_height: 0.275 INCHES NOMINAL IN, outside_diameter: 3.319 INCHES NOMINAL IN, style_designator: SOLID, end_item_identification: WESTINGHOUSE 1/4 IN. REDUCING VALVE MODEL 539561 IN.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-184-4721, indicating validated use in U.S. government and defense logistics supply chains.

Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
539561 PIECE 3
NSN: 4820-01-184-4721
FSC: 4820
CAGE: 24821 — ROSEMOUNT ANALYTICAL, INC. DIV PROCESS ANALYTICAL DIVISION (USA)
SPECIFICATIONS
materialCOPPER ALLOY
overall_height0.275 INCHES NOMINAL IN
outside_diameter3.319 INCHES NOMINAL IN
style_designatorSOLID
end_item_identificationWESTINGHOUSE 1/4 IN. REDUCING VALVE MODEL 539561 IN
NSN4820-01-184-4721
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 539561 PIECE 3 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
STYLE DESIGNATOR: SOLID
•
OUTSIDE DIAMETER: 3.319 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL HEIGHT0.275 INCHES NOMINAL IN
END ITEM IDENTIFICATIONWESTINGHOUSE 1/4 IN. REDUCING VALVE MODEL 539561 IN
STYLE DESIGNATORSOLID
OUTSIDE DIAMETER3.319 INCHES NOMINAL IN
MATERIALCOPPER ALLOY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
542024Interchangeable
interchangeable cross-reference
interchangeable
54-618Interchangeable
interchangeable cross-reference
interchangeable
BB3WP 18X6Interchangeable
interchangeable cross-reference
interchangeable
542-0024Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 539561 PIECE 3?
539561 PIECE 3 is a DISK,VALVE.
What parts can replace 539561 PIECE 3?
There are 4 known substitutes for 539561 PIECE 3: 542024, 54-618, BB3WP 18X6 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 539561 PIECE 3?
539561 PIECE 3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-184-4721. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026