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PartsTable / COMPONENT / A6SI51-3
A6SI51-3 ✓ 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 VALVE,STOP-CHECK is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY SEAT, special_features: STYLE DESIGNATOR:NO.60 IRREGULAR SHAPE FROM FIIG A03200, supplementary_features: CROSS-SECTIONAL SHAPE STYLE:NO.195 IRREGULAR SHAPE FROM FIIG A03200. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-022-1369, 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
A6SI51-3
NSN: 4820-01-022-1369
FSC: 4820
CAGE: 0JC12 — BEC SYSTEMS LLC DBA BEC MACHINE PRODUCTS (USA)
SPECIFICATIONS
materialNICKEL ALLOY SEAT
special_featuresSTYLE DESIGNATOR:NO.60 IRREGULAR SHAPE FROM FIIG A03200
supplementary_featuresCROSS-SECTIONAL SHAPE STYLE:NO.195 IRREGULAR SHAPE FROM FIIG A03200
NSN4820-01-022-1369
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: A6SI51-3 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
40174Interchangeable
interchangeable cross-reference
interchangeable
648698Interchangeable
interchangeable cross-reference
interchangeable
402-3703Interchangeable
interchangeable cross-reference
interchangeable
C-4581Interchangeable
interchangeable cross-reference
interchangeable
4505-1-DCInterchangeable
interchangeable cross-reference
interchangeable
045051DBInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A6SI51-3?
A6SI51-3 is a VALVE,STOP-CHECK.
What parts can replace A6SI51-3?
There are 8 known substitutes for A6SI51-3: 40174, 648698, 402-3703 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A6SI51-3?
A6SI51-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-022-1369. 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