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Technical Data Sheet
PartsTable / MRO / 346403
346403 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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

CAPACITOR,FIXED,PAPER DIELECTRIC. Key specifications include end_item_identification: USED ON DARC EQUIPMENT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-618-2500, 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
MRO→ MRO_GENERAL→ 346403
NSN: 4820-00-618-2500
FSC: 4820
CAGE: 00742 — AIR PRODUCTS & CHEMICALS, INC (USA)
SPECIFICATIONS
end_item_identificationUSED ON DARC EQUIPMENT
NSN4820-00-618-2500
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 346403 · 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
•
FILTER: NOT INCLUDEDNOT INCLUDED
•
OUTLET PRESSURE RANGE: 0.0 TO 500.0 CAMERA MOUNT
•
FIRST END CONNECTION TYPE: THREADED INTERNAL PIPETHREADED INTERNAL PIPE
•
REGULATION TYPE: 1ST STAGE AUTOMATIC, 2ND STAGE MANUAL1ST STAGE AUTOMATIC, 2ND STAGE MANUAL
•
MATERIAL: COPPER ALLOY STEMCOPPER ALLOY STEM
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 1/4-18 NPT FIRST END1/4-18 NPT FIRST END
•
MAXIMUM INLET PRESSURE RATING: ERR-060
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
TECHNICAL CHARACTERISTICS (FLIS)
FILTERNOT INCLUDEDNOT INCLUDED
OUTLET PRESSURE RANGE0.0 TO 500.0 CAMERA MOUNT
FIRST END CONNECTION TYPETHREADED INTERNAL PIPETHREADED INTERNAL PIPE
REGULATION TYPE1ST STAGE AUTOMATIC, 2ND STAGE MANUAL1ST STAGE AUTOMATIC, 2ND STAGE MANUAL
MATERIALCOPPER ALLOY STEMCOPPER ALLOY STEM
THREAD SIZE AND SERIES/TYPE DESIGNATOR1/4-18 NPT FIRST END1/4-18 NPT FIRST END
MATERIALCOPPER ALLOY FLOW CONTROL DEVICECOPPER ALLOY FLOW CONTROL DEVICE
MAXIMUM INLET PRESSURE RATINGERR-060
BODY STYLEANGLEANGLE
MEDIA FOR WHICH DESIGNEDAIRAIR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
C4640-3Interchangeable
interchangeable cross-reference
interchangeable
8500348-3Interchangeable
interchangeable cross-reference
interchangeable
4640-3Interchangeable
interchangeable cross-reference
interchangeable
340980Interchangeable
interchangeable cross-reference
interchangeable
346403Interchangeable
interchangeable cross-reference
interchangeable
20774-144Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 346403?
346403 is a CAPACITOR,FIXED,PAPER DIELECTRIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace 346403?
There are 11 known substitutes for 346403: C4640-3, 8500348-3, 4640-3 and 8 more. Substitute compatibility should be verified for your specific system.
Is 346403 still available?
346403 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026