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A40451 ✓ 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

ACTUATOR,ELECTRO-MECHANICAL,LINE. Key specifications include body_width: 6.188 INCHES NOMINAL IN, duty_cycle: INTERMITTENT, body_height: 7.188 INCHES NOMINAL IN, body_length: 18.375 INCHES NOMINAL IN, current_type: AC, mounting_facility: THREADED MOUNTING HOLES. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4810-01-221-7459, 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
A40451
NSN: 4810-01-221-7459
FSC: 4810
CAGE: 16626 — CIRCOR INTL INC (USA)
SPECIFICATIONS
body_width6.188 INCHES NOMINAL IN
duty_cycleINTERMITTENT
body_height7.188 INCHES NOMINAL IN
body_length18.375 INCHES NOMINAL IN
current_typeAC
mounting_facilityTHREADED MOUNTING HOLES
NSN4810-01-221-7459
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: A40451 · 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
•
BODY HEIGHT: 7.188 INCHES NOMINAL IN
•
BODY WIDTH: 6.188 INCHES NOMINAL IN
•
CURRENT TYPE: AC
•
BODY LENGTH: 18.375 INCHES NOMINAL IN
•
MOUNTING FACILITY: THREADED MOUNTING HOLES
•
DUTY CYCLE: INTERMITTENT
TECHNICAL CHARACTERISTICS (FLIS)
BODY HEIGHT7.188 INCHES NOMINAL IN
BODY WIDTH6.188 INCHES NOMINAL IN
CURRENT TYPEAC
BODY LENGTH18.375 INCHES NOMINAL IN
MOUNTING FACILITYTHREADED MOUNTING HOLES
DUTY CYCLEINTERMITTENT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
375BInterchangeable
interchangeable cross-reference
interchangeable
90365Interchangeable
interchangeable cross-reference
interchangeable
77-21201Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A40451?
A40451 is a ACTUATOR,ELECTRO-MECHANICAL,LINE.
What parts can replace A40451?
There are 3 known substitutes for A40451: 375B, 90365, 77-21201. Substitute compatibility should be verified for your specific system.
What is the NSN for A40451?
A40451 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4810-01-221-7459. 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