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566-6985434-11 — CYLINDER SLEEVE AND PISTON ASSEM

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

566-6985434-11: CYLINDER SLEEVE AND PISTON ASSEM.

CYLINDER SLEEVE AND PISTON ASSEM. Key specifications include material: NICKEL ALLOY, overall_length: 3.500 INCHES NOMINAL IN, outside_diameter: 1.125 INCHES NOMINAL IN, special_features: FOLLOW UP MEC, nominal_thread_size: 1.125 INCHES IN, end_item_identification: LOS ANGELES CLASS SSN (688). This part is cataloged in the U.S.

Government catalog under NSN 4820-01-491-6489, 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
566-6985434-11
NSN: 4820-01-491-6489
FSC: 4820 — Valves, Nonpowered
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialNICKEL ALLOY
overall_length3.500 INCHES NOMINAL IN
outside_diameter1.125 INCHES NOMINAL IN
special_featuresFOLLOW UP MEC
nominal_thread_size1.125 INCHES IN
end_item_identificationLOS ANGELES CLASS SSN (688)
valve_design_control_activity53711
valve_size_for_which_designed1.250 INCHES IN
NSN4820-01-491-6489
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 566-6985434-11 · 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
•
OUTSIDE DIAMETER: 1.125 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 1.125 INCHES IN
•
VALVE SIZE FOR WHICH DESIGNED: 1.250 INCHES IN
•
VALVE DESIGN CONTROL ACTIVITY: 53711
•
MATERIAL: NICKEL ALLOY
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER1.125 INCHES NOMINAL IN
OVERALL LENGTH3.500 INCHES NOMINAL IN
NOMINAL THREAD SIZE1.125 INCHES IN
VALVE SIZE FOR WHICH DESIGNED1.250 INCHES IN
SPECIAL FEATURESFOLLOW UP MEC
VALVE DESIGN CONTROL ACTIVITY53711
END ITEM IDENTIFICATIONLOS ANGELES CLASS SSN (688)
MATERIALNICKEL ALLOY
SUBSTITUTES & CROSS-REFERENCES 2
H623-0507-11Reference document
Same NSN cross-reference
Reference document — Secondary reference
566-6985434Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 566-6985434-11?
566-6985434-11 is a CYLINDER SLEEVE AND PISTON ASSEM.
What parts can replace 566-6985434-11?
There are 2 known substitutes for 566-6985434-11: H623-0507-11, 566-6985434. Substitute compatibility should be verified for your specific system.
What is the NSN for 566-6985434-11?
566-6985434-11 is cataloged in the U.S. Government catalog under NSN 4820-01-491-6489. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.