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551-6685220-24 — VALVE ASSEMBLY,MANIFOLD

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

551-6685220-24: VALVE ASSEMBLY,MANIFOLD.

The VALVE ASSEMBLY,MANIFOLD is a the manufacturer industrial component. Key specifications include thread_class: 2B, body_material: STEEL COMP 304, connection_type: THREADED EXTERNAL BOSS, nominal_thread_size: 0.750 INCHES AND 0.438 INCHES IN, valve_operation_method: AUTOMATIC, end_item_identification: SEAWOLF CLASS SSN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-418-6563, 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
551-6685220-24
NSN: 4820-01-418-6563
FSC: 4820 — Valves, Nonpowered
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
thread_class2B
body_materialSTEEL COMP 304
valve_quantity5
connection_typeTHREADED EXTERNAL BOSS
nominal_thread_size0.750 INCHES AND 0.438 INCHES IN
valve_operation_methodAUTOMATIC
end_connection_quantity5
end_item_identificationSEAWOLF CLASS SSN
thread_series_designatorUNF
NSN4820-01-418-6563
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 551-6685220-24 · 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
•
VALVE QUANTITY: 5
•
CONNECTION TYPE: THREADED EXTERNAL BOSS
•
END CONNECTION QUANTITY: 5
•
NOMINAL THREAD SIZE: 0.750 INCHES AND 0.438 INCHES IN
•
BODY MATERIAL: STEEL COMP 304
•
THREAD CLASS: 2B
•
THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS
VALVE QUANTITY5
CONNECTION TYPETHREADED EXTERNAL BOSS
END CONNECTION QUANTITY5
NOMINAL THREAD SIZE0.750 INCHES AND 0.438 INCHES IN
BODY MATERIALSTEEL COMP 304
THREAD CLASS2B
END ITEM IDENTIFICATIONSEAWOLF CLASS SSN
THREAD SERIES DESIGNATORUNF
VALVE OPERATION METHODAUTOMATIC
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES 1
6685223Reference 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 551-6685220-24?
551-6685220-24 is a VALVE ASSEMBLY,MANIFOLD.
What parts can replace 551-6685220-24?
There is 1 known substitute for 551-6685220-24: 6685223. Substitute compatibility should be verified for your specific system.
What is the NSN for 551-6685220-24?
551-6685220-24 is cataloged in the U.S. Government catalog under NSN 4820-01-418-6563. 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.