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2640-671X2 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

2640-671X2: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON OVERALL, seat_radius: 0.625 INCHES NOMINAL IN, overall_height: 0.625 INCHES NOMINAL IN, style_designator: PLAIN, body_inside_diameter: 2.125 INCHES NOMINAL IN, body_outside_diameter: 3.622 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-135-1337, 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
2640-671X2
NSN: 4820-01-135-1337
FSC: 4820 — Valves, Nonpowered
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON OVERALL
seat_radius0.625 INCHES NOMINAL IN
overall_height0.625 INCHES NOMINAL IN
style_designatorPLAIN
body_inside_diameter2.125 INCHES NOMINAL IN
body_outside_diameter3.622 INCHES NOMINAL IN
seating_surface_shapeRADIAL
seal_accommodation_typeGROOVED
NSN4820-01-135-1337
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 2640-671X2 · 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: 3.622 INCHES NOMINAL IN
•
SEAL ACCOMMODATION TYPE: GROOVED
•
STYLE DESIGNATOR: PLAIN
•
BODY INSIDE DIAMETER: 2.125 INCHES NOMINAL IN
•
SEAT RADIUS: 0.625 INCHES NOMINAL IN
•
MATERIAL: PLASTIC POLYAMIDE NYLON OVERALL
•
SEATING SURFACE SHAPE: RADIAL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.625 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER3.622 INCHES NOMINAL IN
SEAL ACCOMMODATION TYPEGROOVED
STYLE DESIGNATORPLAIN
BODY INSIDE DIAMETER2.125 INCHES NOMINAL IN
SEAT RADIUS0.625 INCHES NOMINAL IN
MATERIALPLASTIC POLYAMIDE NYLON OVERALL
SEATING SURFACE SHAPERADIAL
SUBSTITUTES & CROSS-REFERENCES 2
845-2180979 PIEReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
845-2180979Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
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 2640-671X2?
2640-671X2 is a SEAT,VALVE.
What parts can replace 2640-671X2?
There are 2 known substitutes for 2640-671X2: 845-2180979 PIE, 845-2180979. Substitute compatibility should be verified for your specific system.
What is the NSN for 2640-671X2?
2640-671X2 is cataloged in the U.S. Government catalog under NSN 4820-01-135-1337. 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.