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2640-695X1 PIEC — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

2640-695X1 PIEC: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON OVERALL, overall_height: 0.312 INCHES NOMINAL IN, hardness_rating: 75.0 ROCKWELL M NOMINAL FACE, style_designator: PLAIN, seat_angle_in_deg: 45.000 NOMINAL, body_inside_diameter: 0.812 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-878-0471, 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
2640-695X1 PIEC
NSN: 4820-00-878-0471
FSC: 4820 — Valves, Nonpowered
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON OVERALL
overall_height0.312 INCHES NOMINAL IN
hardness_rating75.0 ROCKWELL M NOMINAL FACE
style_designatorPLAIN
seat_angle_in_deg45.000 NOMINAL
body_inside_diameter0.812 INCHES NOMINAL IN
body_outside_diameter1.746 INCHES NOMINAL IN
seating_surface_shapeANGULAR
seal_accommodation_typeGROOVED
NSN4820-00-878-0471
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 2640-695X1 PIEC · 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: 1.746 INCHES NOMINAL IN
•
SEAL ACCOMMODATION TYPE: GROOVED
•
HARDNESS RATING: 75.0 ROCKWELL M NOMINAL BODY
•
STYLE DESIGNATOR: PLAIN
•
BODY INSIDE DIAMETER: 0.812 INCHES NOMINAL IN
•
MATERIAL: PLASTIC POLYAMIDE NYLON OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.312 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER1.746 INCHES NOMINAL IN
SEAL ACCOMMODATION TYPEGROOVED
HARDNESS RATING75.0 ROCKWELL M NOMINAL BODY
HARDNESS RATING75.0 ROCKWELL M NOMINAL FACE
STYLE DESIGNATORPLAIN
BODY INSIDE DIAMETER0.812 INCHES NOMINAL IN
MATERIALPLASTIC POLYAMIDE NYLON OVERALL
SEAT ANGLE IN DEG45.000 NOMINAL
SEATING SURFACE SHAPEANGULAR
SUBSTITUTES & CROSS-REFERENCES 2
20-09523Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
N050-6Reference document
Same NSN cross-reference
Reference document — Design control — primary 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 2640-695X1 PIEC?
2640-695X1 PIEC is a SEAT,VALVE.
What parts can replace 2640-695X1 PIEC?
There are 2 known substitutes for 2640-695X1 PIEC: 20-09523, N050-6. Substitute compatibility should be verified for your specific system.
What is the NSN for 2640-695X1 PIEC?
2640-695X1 PIEC is cataloged in the U.S. Government catalog under NSN 4820-00-878-0471. 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.