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8549-030-279 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

8549-030-279: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING SEAT, overall_height: 1.750 INCHES NOMINAL IN, style_designator: PLAIN, body_inside_diameter: 19.250 INCHES NOMINAL IN, body_outside_diameter: 20.490 INCHES NOMINAL IN, seating_surface_shape: FLAT. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-445-0877, 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
8549-030-279
NSN: 4820-01-445-0877
FSC: 4820 — Valves, Nonpowered
CAGE: 57574 — VELAN VALVE CORP. (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING SEAT
overall_height1.750 INCHES NOMINAL IN
style_designatorPLAIN
body_inside_diameter19.250 INCHES NOMINAL IN
body_outside_diameter20.490 INCHES NOMINAL IN
seating_surface_shapeFLAT
end_item_identificationNIMITZ CLASS CVN
material_document_and_classificationASTM A106, GRADE B ASSN STD SINGLE MATERIAL RESPONSE SEAT
NSN4820-01-445-0877
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 8549-030-279 · 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
•
BODY OUTSIDE DIAMETER: 20.490 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A106, GRADE B ASSN STD SINGLE MATERIAL RESPONSE SEAT
•
BODY INSIDE DIAMETER: 19.250 INCHES NOMINAL IN
•
MATERIAL: STEEL CORROSION RESISTING SEAT
•
SEATING SURFACE SHAPE: FLAT
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT1.750 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER20.490 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A106, GRADE B ASSN STD SINGLE MATERIAL RESPONSE SEAT
BODY INSIDE DIAMETER19.250 INCHES NOMINAL IN
END ITEM IDENTIFICATIONNIMITZ CLASS CVN
MATERIALSTEEL CORROSION RESISTING SEAT
SEATING SURFACE SHAPEFLAT
SUBSTITUTES & CROSS-REFERENCES 2
9799-733Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
9799-733 ITEM 5 20INSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 8549-030-279?
8549-030-279 is a SEAT,VALVE.
What parts can replace 8549-030-279?
There are 2 known substitutes for 8549-030-279: 9799-733, 9799-733 ITEM 5 20IN. Substitute compatibility should be verified for your specific system.
What is the NSN for 8549-030-279?
8549-030-279 is cataloged in the U.S. Government catalog under NSN 4820-01-445-0877. 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.