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AA23178PC178-55 — DIAPHRAGM,VALVE,FLAT

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

AA23178PC178-55: DIAPHRAGM,VALVE,FLAT.

The DIAPHRAGM,VALVE,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING, outside_diameter: 3.750 INCHES NOMINAL IN, style_designator: FLAT, material_thickness: 0.024 INCHES NOMINAL IN, center_hole_diameter: 0.772 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-326-6003, 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
AA23178PC178-55
NSN: 4820-00-326-6003
FSC: 4820 — Valves, Nonpowered
CAGE: 11859 — HUNT VALVE COMPANY, INC. (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
outside_diameter3.750 INCHES NOMINAL IN
style_designatorFLAT
material_thickness0.024 INCHES NOMINAL IN
center_hole_diameter0.772 INCHES NOMINAL IN
NSN4820-00-326-6003
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: AA23178PC178-55 · 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: 3.750 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLAT
•
MATERIAL THICKNESS: 0.024 INCHES NOMINAL IN
•
CENTER HOLE DIAMETER: 0.772 INCHES NOMINAL IN
•
MATERIAL: STEEL CORROSION RESISTING
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER3.750 INCHES NOMINAL IN
STYLE DESIGNATORFLAT
MATERIAL THICKNESS0.024 INCHES NOMINAL IN
CENTER HOLE DIAMETER0.772 INCHES NOMINAL IN
MATERIALSTEEL CORROSION RESISTING
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 9
AA21041PC19821-54Reference document
Same NSN cross-reference
Reference document — Secondary reference
D18271QCReference document
Same NSN cross-reference
Reference document — Secondary reference
AA22055PC22052-55Reference document
Same NSN cross-reference
Reference document — Secondary reference
AA19821PC19821-4Reference document
Same NSN cross-reference
Reference document — Secondary reference
AA21041-1PC19821-54Reference document
Same NSN cross-reference
Reference document — Secondary reference
AA23019PC23017-55Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AA23178PC178-55?
AA23178PC178-55 is a DIAPHRAGM,VALVE,FLAT.
What parts can replace AA23178PC178-55?
There are 9 known substitutes for AA23178PC178-55: AA21041PC19821-54, D18271QC, AA22055PC22052-55 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AA23178PC178-55?
AA23178PC178-55 is cataloged in the U.S. Government catalog under NSN 4820-00-326-6003. 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.