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1391949 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

1391949: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, seat_radius: 0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN, flange_diameter: 3.495 INCHES MINIMUM AND 3.505 INCHES MAXIMUM IN, style_designator: PLAIN FLANGED, under_flange_height: 3.688 INCHES NOMINAL IN, body_inside_diameter: 1.995 INCHES MINIMUM AND 2.005 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-149-2092, 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
1391949
NSN: 4820-00-149-2092
FSC: 4820 — Valves, Nonpowered
CAGE: 90099 — NORTHROP GRUMMAN SYSTEMS CORPORATION DIV MARINE SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
seat_radius0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
flange_diameter3.495 INCHES MINIMUM AND 3.505 INCHES MAXIMUM IN
style_designatorPLAIN FLANGED
under_flange_height3.688 INCHES NOMINAL IN
body_inside_diameter1.995 INCHES MINIMUM AND 2.005 INCHES MAXIMUM IN
body_outside_diameter3.002 INCHES MINIMUM AND 3.003 INCHES MAXIMUM IN
seating_surface_shapeRADIAL
flange_seat_to_disk_end_height0.875 INCHES NOMINAL IN
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4820-00-149-2092
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 1391949 · 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: 0.875 INCHES NOMINAL IN
•
FLANGE DIAMETER: 3.495 INCHES MINIMUM AND 3.505 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 3.002 INCHES MINIMUM AND 3.003 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: PLAIN FLANGED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
BODY INSIDE DIAMETER: 1.995 INCHES MINIMUM AND 2.005 INCHES MAXIMUM IN
•
SEAT RADIUS: 0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
•
UNDER FLANGE HEIGHT: 3.688 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.875 INCHES NOMINAL IN
FLANGE DIAMETER3.495 INCHES MINIMUM AND 3.505 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER3.002 INCHES MINIMUM AND 3.003 INCHES MAXIMUM IN
STYLE DESIGNATORPLAIN FLANGED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
BODY INSIDE DIAMETER1.995 INCHES MINIMUM AND 2.005 INCHES MAXIMUM IN
SEAT RADIUS0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
UNDER FLANGE HEIGHT3.688 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
SEATING SURFACE SHAPERADIAL
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 3
9G985PC2Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
M11E433PC32Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
11E433PC32Reference 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 1391949?
1391949 is a SEAT,VALVE.
What parts can replace 1391949?
There are 3 known substitutes for 1391949: 9G985PC2, M11E433PC32, 11E433PC32. Substitute compatibility should be verified for your specific system.
What is the NSN for 1391949?
1391949 is cataloged in the U.S. Government catalog under NSN 4820-00-149-2092. 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.