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77643-74X2 PIEC — DISK,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

77643-74X2 PIEC: DISK,VALVE.

The DISK,VALVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, overall_height: 4.000 INCHES NOMINAL IN, outside_diameter: 12.984 INCHES MINIMUM AND 12.988 INCHES MAXIMUM IN, style_designator: SOLID, media_for_which_designed: AIR. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-193-3632, 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
77643-74X2 PIEC
NSN: 4820-01-193-3632
FSC: 4820 — Valves, Nonpowered
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialCOPPER ALLOY
overall_height4.000 INCHES NOMINAL IN
outside_diameter12.984 INCHES MINIMUM AND 12.988 INCHES MAXIMUM IN
style_designatorSOLID
media_for_which_designedAIR
NSN4820-01-193-3632
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 77643-74X2 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
•
OUTSIDE DIAMETER: 12.984 INCHES MINIMUM AND 12.988 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID
•
MEDIA FOR WHICH DESIGNED: AIR
•
MATERIAL: COPPER ALLOY
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT4.000 INCHES NOMINAL IN
OUTSIDE DIAMETER12.984 INCHES MINIMUM AND 12.988 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID
MEDIA FOR WHICH DESIGNEDAIR
MATERIALCOPPER ALLOY
SUBSTITUTES & CROSS-REFERENCES 3
SSN637-501-2143875Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
SSN637-501-2143875 PIECE 3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
77643-74X2Reference 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 77643-74X2 PIEC?
77643-74X2 PIEC is a DISK,VALVE.
What parts can replace 77643-74X2 PIEC?
There are 3 known substitutes for 77643-74X2 PIEC: SSN637-501-2143875, SSN637-501-2143875 PIECE 3, 77643-74X2. Substitute compatibility should be verified for your specific system.
What is the NSN for 77643-74X2 PIEC?
77643-74X2 PIEC is cataloged in the U.S. Government catalog under NSN 4820-01-193-3632. 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.