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AA840A — VALVE,VACUUM BREAKING

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

AA840A: VALVE,VACUUM BREAKING.

The VALVE,VACUUM BREAKING is a the manufacturer industrial component. Key specifications include material: PLASTIC SEAT, body_style: SINGLE CONNECTION, STRAIGHT FLOW, body_material: PLASTIC, temp_adjustability: NOT ADJUSTABLE, flow_control_device: POPPET, first_end_connection_type: THREADED EXTERNAL PIPE. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-462-2098, 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
AA840A
NSN: 4820-00-462-2098
NIINs: 004622098, 014613862
FSC: 4820 — Valves, Nonpowered
CAGE: 24123 — GAST MFG CORP (USA)
SPECIFICATIONS
materialPLASTIC SEAT
body_styleSINGLE CONNECTION, STRAIGHT FLOW
body_materialPLASTIC
temp_adjustabilityNOT ADJUSTABLE
flow_control_devicePOPPET
end_connection_quantity1
first_end_connection_typeTHREADED EXTERNAL PIPE
first_end_style_designatorPLAIN
first_end_thread_directionRIGHT-HAND
first_end_nominal_pipe_size_accommodated0.375 INCHES IN
NSN4820-00-462-2098
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: AA840A · 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
•
FLOW CONTROL DEVICE: POPPET
•
FIRST END THREAD DIRECTION: RIGHT-HAND
•
BODY STYLE: SINGLE CONNECTION, STRAIGHT FLOW
•
FIRST END STYLE DESIGNATOR: PLAIN
•
END CONNECTION QUANTITY: 1
•
BODY MATERIAL: PLASTIC
•
FIRST END CONNECTION TYPE: THREADED EXTERNAL PIPE
•
TEMP ADJUSTABILITY: NOT ADJUSTABLE
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEPOPPET
FIRST END THREAD DIRECTIONRIGHT-HAND
BODY STYLESINGLE CONNECTION, STRAIGHT FLOW
FIRST END STYLE DESIGNATORPLAIN
END CONNECTION QUANTITY1
BODY MATERIALPLASTIC
FIRST END CONNECTION TYPETHREADED EXTERNAL PIPE
TEMP ADJUSTABILITYNOT ADJUSTABLE
FIRST END NOMINAL PIPE SIZE ACCOMMODATED0.375 INCHES IN
MATERIALPLASTIC FLOW CONTROL DEVICE
SUBSTITUTES & CROSS-REFERENCES 1
7M729-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 AA840A?
AA840A is a VALVE,VACUUM BREAKING.
What parts can replace AA840A?
There is 1 known substitute for AA840A: 7M729-1. Substitute compatibility should be verified for your specific system.
What is the NSN for AA840A?
AA840A is cataloged in the U.S. Government catalog under NSN 4820-00-462-2098. 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.