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PartsTable / COMPONENT / 21107977-MOD-OPR
21107977-MOD-OPR ✓ 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 GEAR OPERATOR,VALVE is a the manufacturer industrial component. Key specifications include gear_type: WORM, gear_ratio: 30 TO 1, end_item_identification: SEAWOLF CLASS SSN, part_name_assigned_by_controlling_agency: HANDWHEEL GEAR OPERATOR AS MODIFIED BY ELECTRIC BOAT.. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-522-6001, 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
21107977-MOD-OPR
NSN: 4820-01-522-6001
FSC: 4820
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
gear_typeWORM
gear_ratio30 TO 1
end_item_identificationSEAWOLF CLASS SSN
part_name_assigned_by_controlling_agencyHANDWHEEL GEAR OPERATOR AS MODIFIED BY ELECTRIC BOAT.
NSN4820-01-522-6001
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 21107977-MOD-OPR · 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
•
GEAR RATIO: 30 TO 1
•
GEAR TYPE: WORM
TECHNICAL CHARACTERISTICS (FLIS)
PART NAME ASSIGNED BY CONTROLLING AGENCYHANDWHEEL GEAR OPERATOR AS MODIFIED BY ELECTRIC BOAT.
END ITEM IDENTIFICATIONSEAWOLF CLASS SSN
GEAR RATIO30 TO 1
GEAR TYPEWORM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
B00759-00Interchangeable
interchangeable cross-reference
interchangeable
V73065M1Interchangeable
interchangeable cross-reference
interchangeable
2815001507407Interchangeable
interchangeable cross-reference
interchangeable
42011Interchangeable
interchangeable cross-reference
interchangeable
AF-383Interchangeable
interchangeable cross-reference
interchangeable
PA-614Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21107977-MOD-OPR?
21107977-MOD-OPR is a GEAR OPERATOR,VALVE.
What parts can replace 21107977-MOD-OPR?
There are 17 known substitutes for 21107977-MOD-OPR: B00759-00, V73065M1, 2815001507407 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21107977-MOD-OPR?
21107977-MOD-OPR is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-522-6001. 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