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PartsTable / COMPONENT / 2640-801X1
2640-801X1 ✓ Verified by PartsTable
— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYURETHANE OVERALL, seat_radius: 0.281 INCHES NOMINAL IN, overall_height: 0.250 INCHES NOMINAL IN, special_features: MEARTHANE VALVE SEAT MATERIAL, style_designator: PLAIN, body_inside_diameter: 0.562 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-061-7138, 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
2640-801X1
NSN: 4820-01-061-7138
FSC: 4820
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialPLASTIC POLYURETHANE OVERALL
seat_radius0.281 INCHES NOMINAL IN
overall_height0.250 INCHES NOMINAL IN
special_featuresMEARTHANE VALVE SEAT MATERIAL
style_designatorPLAIN
body_inside_diameter0.562 INCHES NOMINAL IN
body_outside_diameter1.0620 INCHES NOMINAL IN
seating_surface_shapeRADIAL
end_item_identificationNSSN CLASS SUBMARINE, TOWED SONAR HULL AND BACKUP VALVE
material_document_and_classificationMD-71GG MFR REF SINGLE MATERIAL RESPONSE OVERALL
NSN4820-01-061-7138
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 2640-801X1 · 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
•
SEAT ANGLE IN DEG: 45.000 NOMINAL
•
MATERIAL: PLASTIC ACETAL OVERALL
•
SEATING SURFACE SHAPE: ANGULAR
•
MATERIAL DOCUMENT AND CLASSIFICATION: DE568 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
STYLE DESIGNATOR: PLAIN
•
BODY INSIDE DIAMETER: 3.062 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 4.484 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SEAT ANGLE IN DEG45.000 NOMINAL
MATERIALPLASTIC ACETAL OVERALL
SEATING SURFACE SHAPEANGULAR
MATERIAL DOCUMENT AND CLASSIFICATIONDE568 MFR REF SINGLE MATERIAL RESPONSE OVERALL
STYLE DESIGNATORPLAIN
OVERALL HEIGHT0.562 INCHES NOMINAL IN
BODY INSIDE DIAMETER3.062 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER4.484 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
845-8616948-PIECE NO-12Interchangeable
interchangeable cross-reference
interchangeable
2644-747-01-PIECE NO-12Q3Interchangeable
interchangeable cross-reference
interchangeable
2640-801X1 PIECE 22Interchangeable
interchangeable cross-reference
interchangeable
845-7284929-ITEM NO-11Interchangeable
interchangeable cross-reference
interchangeable
845-4687594 ITEM 20Interchangeable
interchangeable cross-reference
interchangeable
845-7284929-ITEM NO-11Q3Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2640-801X1?
2640-801X1 is a SEAT,VALVE.
What parts can replace 2640-801X1?
There are 19 known substitutes for 2640-801X1: 845-8616948-PIECE NO-12, 2644-747-01-PIECE NO-12Q3, 2640-801X1 PIECE 22 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 2640-801X1?
2640-801X1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-061-7138. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026