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LSD 8503 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

LSD 8503: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL SEAT, stem_type: RISING, valve_size: 6.000 INCHES IN, bonnet_type: OUTSIDE SCREW-YOKE, connection_type: FLANGE, ROUND W/HOLES, flange_diameter: 11.000 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-447-3486, 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
LSD 8503
NSN: 4820-01-447-3486
NIINs: 014473486, 014473487, 014473490, 014681833
FSC: 4820 — Valves, Nonpowered
CAGE: 79342 — WILLIAM E WILLIAMS VALVE CORP (USA)
SPECIFICATIONS
materialSTEEL SEAT
stem_typeRISING
valve_size6.000 INCHES IN
bonnet_typeOUTSIDE SCREW-YOKE
connection_typeFLANGE, ROUND W/HOLES
flange_diameter11.000 INCHES IN
style_designatorSPLIT WEDGE
bolt_hole_quantity8
flange_face_designRAISED
face_to_face_distance10.500 INCHES IN
seating_surface_shapeFLAT
valve_operation_methodMANUAL
NSN4820-01-447-3486
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: LSD 8503 · 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
•
STYLE DESIGNATOR: PLAIN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A216, GRADE WCB ASSN STD SINGLE MATERIAL RESPONSE SEAT
•
MATERIAL: STEEL SEAT
•
SEATING SURFACE SHAPE: FLAT
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORPLAIN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A216, GRADE WCB ASSN STD SINGLE MATERIAL RESPONSE SEAT
END ITEM IDENTIFICATIONSTRATEGIC SEALIFT CONVERSION SHIPS CLASS
MATERIALSTEEL SEAT
SEATING SURFACE SHAPEFLAT
SUBSTITUTES & CROSS-REFERENCES 1
LSD 8503 ITEM 3 6INReference 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 LSD 8503?
LSD 8503 is a SEAT,VALVE.
What parts can replace LSD 8503?
There is 1 known substitute for LSD 8503: LSD 8503 ITEM 3 6IN. Substitute compatibility should be verified for your specific system.
What is the NSN for LSD 8503?
LSD 8503 is cataloged in the U.S. Government catalog under NSN 4820-01-447-3486. 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.