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73423-20 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

73423-20: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING SEAT, overall_height: 0.932 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN, flange_diameter: 4.563 INCHES NOMINAL IN, special_features: WITH STELLITE NO. 6, body_inside_diameter: 3.500 INCHES MINIMUM AND 3.505 INCHES MAXIMUM IN, body_outside_diameter: 4.313 INCHES NOMINAL IN.

This part is cataloged in the U.S. Government catalog under NSN 4820-01-284-2246, 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
73423-20
NSN: 4820-01-284-2246
FSC: 4820 — Valves, Nonpowered
CAGE: 57574 — VELAN VALVE CORP. (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING SEAT
overall_height0.932 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
flange_diameter4.563 INCHES NOMINAL IN
special_featuresWITH STELLITE NO. 6
body_inside_diameter3.500 INCHES MINIMUM AND 3.505 INCHES MAXIMUM IN
body_outside_diameter4.313 INCHES NOMINAL IN
seating_surface_shapeANGULAR
NSN4820-01-284-2246
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 73423-20 · 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 DIAMETER: 4.563 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 4.313 INCHES NOMINAL IN
•
BODY INSIDE DIAMETER: 3.500 INCHES MINIMUM AND 3.505 INCHES MAXIMUM IN
•
MATERIAL: STEEL CORROSION RESISTING SEAT
•
SEATING SURFACE SHAPE: ANGULAR
TECHNICAL CHARACTERISTICS
FLANGE DIAMETER4.563 INCHES NOMINAL IN
OVERALL HEIGHT0.932 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER4.313 INCHES NOMINAL IN
BODY INSIDE DIAMETER3.500 INCHES MINIMUM AND 3.505 INCHES MAXIMUM IN
SPECIAL FEATURESWITH STELLITE NO. 6
MATERIALSTEEL CORROSION RESISTING SEAT
SEATING SURFACE SHAPEANGULAR
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
73423 4IN ITEM 3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 73423-20?
73423-20 is a SEAT,VALVE.
What parts can replace 73423-20?
There is 1 known substitute for 73423-20: 73423 4IN ITEM 3. Substitute compatibility should be verified for your specific system.
What is the NSN for 73423-20?
73423-20 is cataloged in the U.S. Government catalog under NSN 4820-01-284-2246. 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.