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3W11978 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

3W11978: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, flange_diameter: 5.200 INCHES NOMINAL IN, body_outside_diameter: 4.719 INCHES NOMINAL IN, flange_seat_to_disk_end_height: 0.266 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-163-8556, 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
3W11978
NSN: 4820-01-163-8556
FSC: 4820 — Valves, Nonpowered
CAGE: 68866 — GENESEE STAMP AND STATIONERY INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
flange_diameter5.200 INCHES NOMINAL IN
body_outside_diameter4.719 INCHES NOMINAL IN
flange_seat_to_disk_end_height0.266 INCHES NOMINAL IN
NSN4820-01-163-8556
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 3W11978 · 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
•
FLANGE SEAT TO DISK END HEIGHT: 0.266 INCHES NOMINAL IN
•
FLANGE DIAMETER: 5.200 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 4.719 INCHES NOMINAL IN
•
MATERIAL: NICKEL ALLOY OVERALL
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.266 INCHES NOMINAL IN
FLANGE DIAMETER5.200 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER4.719 INCHES NOMINAL IN
MATERIALNICKEL ALLOY OVERALL
SUBSTITUTES & CROSS-REFERENCES 5
CE-1W1197BSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
37689866Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
1W1197BReference document
Same NSN cross-reference
Reference document — Secondary reference
W1197BReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
43CS4MWSReference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3W11978?
3W11978 is a SEAT,VALVE.
What parts can replace 3W11978?
There are 5 known substitutes for 3W11978: CE-1W1197B, 37689866, 1W1197B and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3W11978?
3W11978 is cataloged in the U.S. Government catalog under NSN 4820-01-163-8556. 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.