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Technical Data Sheet
A-A-55540 ✓ Verified by PartsTable
· GATE VALVE
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

The REGULATOR,COMPRESSED GAS is a the manufacturer industrial component. Key specifications include filter: NOT INCLUDEDNOT INCLUDED, body_style: ANGLEANGLE, regulation_type: 1ST STAGE AUTOMATIC, 2ND STAGE MANUAL1ST STAGE AUTOMATIC, 2ND STAGE MANUAL, valve_stem_design: DOUBLE SEATDOUBLE SEAT, flow_control_device: DIAPHRAGMDIAPHRAGM, valve_loading_method: SPRINGSPRING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-007-4596, 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
A-A-55540
NSN: 4820-00-007-4596
FSC: 4820
CAGE: 58536 — FEDERAL COMMERCIAL ITEM DESCRIPTION PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
filterNOT INCLUDEDNOT INCLUDED
body_styleANGLEANGLE
regulation_type1ST STAGE AUTOMATIC, 2ND STAGE MANUAL1ST STAGE AUTOMATIC, 2ND STAGE MANUAL
valve_stem_designDOUBLE SEATDOUBLE SEAT
flow_control_deviceDIAPHRAGMDIAPHRAGM
valve_loading_methodSPRINGSPRING
manual_control_methodKNOBKNOB
outlet_pressure_range0.0 TO 120.0 CAMERA MOUNT
first_end_thread_class3A3A
end_connection_quantity22
media_for_which_designedOXYGEN, GASEOUSOXYGEN, GASEOUS
first_end_connection_typeTHREADED EXTERNAL TUBETHREADED EXTERNAL TUBE
NSN4820-00-007-4596
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS SIZE: — · — · — PN: A-A-55540 · 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
MOUNTING METHOD: CYLINDER
FEATURES PROVIDED: RELIEF VALVE
INLET FITTING CONNECTION TYPE: COMPRESSED GAS ASSOCIATION
DELIVERY PRESSURE TYPE: ADJUSTABLE
OUTLET FITTING NOMINAL THREAD SIZE: 0.625 INCHES IN
STAGE TYPE: SINGLE
OUTLET FITTING THREAD DIRECTION: LEFT-HAND
MOUNTING POSITION: LEFT SIDE
TECHNICAL CHARACTERISTICS (FLIS)
MOUNTING METHODCYLINDER
FEATURES PROVIDEDRELIEF VALVE
INLET FITTING CONNECTION TYPECOMPRESSED GAS ASSOCIATION
DELIVERY PRESSURE TYPEADJUSTABLE
OUTLET FITTING NOMINAL THREAD SIZE0.625 INCHES IN
STAGE TYPESINGLE
OUTLET FITTING THREAD DIRECTIONLEFT-HAND
MOUNTING POSITIONLEFT SIDE
MAXIMUM DELIVERY PRESSURE15.0 POUNDS PER SQUARE INCH LBS
INLET FITTING CONNECTION CGA NUMBER300
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
1362470Interchangeable
interchangeable cross-reference
interchangeable
VTS410A968Interchangeable
interchangeable cross-reference
interchangeable
0781-3983Interchangeable
interchangeable cross-reference
interchangeable
03X05Interchangeable
interchangeable cross-reference
interchangeable
A-A-55540Interchangeable
interchangeable cross-reference
interchangeable
MILR13877Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A-A-55540?
A-A-55540 is a REGULATOR,COMPRESSED GAS.
What parts can replace A-A-55540?
There are 12 known substitutes for A-A-55540: 1362470, VTS410A968, 0781-3983 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A-A-55540?
A-A-55540 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-007-4596. This indicates validated use in U.S. government and defense supply chains.
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