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Y-122451 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

Y-122451: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, flange_diameter: 4.375 INCHES NOMINAL IN, style_designator: PLAIN FLANGED, under_flange_height: 1.250 INCHES NOMINAL IN, body_inside_diameter: 4.031 INCHES NOMINAL IN, body_outside_diameter: 4.344 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-075-0364, 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
Y-122451
NSN: 4820-00-075-0364
FSC: 4820 — Valves, Nonpowered
CAGE: 0UBG9 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DIV EPD (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
flange_diameter4.375 INCHES NOMINAL IN
style_designatorPLAIN FLANGED
under_flange_height1.250 INCHES NOMINAL IN
body_inside_diameter4.031 INCHES NOMINAL IN
body_outside_diameter4.344 INCHES NOMINAL IN
seating_surface_shapeFLAT
flange_seat_to_disk_end_height0.188 INCHES NOMINAL IN
NSN4820-00-075-0364
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: Y-122451 · 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: 0.188 INCHES NOMINAL IN
•
FLANGE DIAMETER: 4.375 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 4.344 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN FLANGED
•
BODY INSIDE DIAMETER: 4.031 INCHES NOMINAL IN
•
UNDER FLANGE HEIGHT: 1.250 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY OVERALL
•
SEATING SURFACE SHAPE: FLAT
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.188 INCHES NOMINAL IN
FLANGE DIAMETER4.375 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER4.344 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN FLANGED
BODY INSIDE DIAMETER4.031 INCHES NOMINAL IN
UNDER FLANGE HEIGHT1.250 INCHES NOMINAL IN
MATERIALCOPPER ALLOY OVERALL
SEATING SURFACE SHAPEFLAT
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
20019PReference document
Same NSN cross-reference
Reference document — Secondary reference
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 Y-122451?
Y-122451 is a SEAT,VALVE.
What parts can replace Y-122451?
There is 1 known substitute for Y-122451: 20019P. Substitute compatibility should be verified for your specific system.
What is the NSN for Y-122451?
Y-122451 is cataloged in the U.S. Government catalog under NSN 4820-00-075-0364. 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.