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N5557 PIECE 3 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

N5557 PIECE 3: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY SEAT, flange_diameter: 1.750 INCHES NOMINAL IN, body_inside_diameter: 0.718 INCHES NOMINAL IN, body_outside_diameter: 1.375 INCHES NOMINAL IN, seating_surface_shape: FLAT, flange_seat_to_disk_end_height: 0.687 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-229-4209, 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
N5557 PIECE 3
NSN: 4820-01-229-4209
FSC: 4820 — Valves, Nonpowered
CAGE: 09032 — TATE ANDALE, LLC (USA)
SPECIFICATIONS
materialCOPPER ALLOY SEAT
flange_diameter1.750 INCHES NOMINAL IN
body_inside_diameter0.718 INCHES NOMINAL IN
body_outside_diameter1.375 INCHES NOMINAL IN
seating_surface_shapeFLAT
flange_seat_to_disk_end_height0.687 INCHES NOMINAL IN
NSN4820-01-229-4209
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: N5557 PIECE 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
KEY FEATURES
•
FLANGE SEAT TO DISK END HEIGHT: 0.687 INCHES NOMINAL IN
•
FLANGE DIAMETER: 1.750 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 1.375 INCHES NOMINAL IN
•
BODY INSIDE DIAMETER: 0.718 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY SEAT
•
SEATING SURFACE SHAPE: FLAT
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.687 INCHES NOMINAL IN
FLANGE DIAMETER1.750 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER1.375 INCHES NOMINAL IN
BODY INSIDE DIAMETER0.718 INCHES NOMINAL IN
MATERIALCOPPER ALLOY SEAT
SEATING SURFACE SHAPEFLAT
SUBSTITUTES & CROSS-REFERENCES 2
VS88RV15H11352RReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
N5557Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is N5557 PIECE 3?
N5557 PIECE 3 is a SEAT,VALVE.
What parts can replace N5557 PIECE 3?
There are 2 known substitutes for N5557 PIECE 3: VS88RV15H11352R, N5557. Substitute compatibility should be verified for your specific system.
What is the NSN for N5557 PIECE 3?
N5557 PIECE 3 is cataloged in the U.S. Government catalog under NSN 4820-01-229-4209. 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.