PartsTable
Technical Data Sheet
D559A-6D-50 ✓ 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 VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 BODY, thread_class: 3A FIRST END A, connection_type: THREADED EXTERNAL TUBE FIRST END, connection_style: PLAIN (TUBE) FIRST END, style_designator: STRAIGHT THRU W/BAFFLE, thread_direction: RIGHT-HAND FIRST END. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-051-8215, 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
D559A-6D-50
NSN: 4820-01-051-8215
FSC: 4820
CAGE: 91816 — CIRCOR AEROSPACE, INC. DBA CIRCOR AEROSPACE INC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 BODY
thread_class3A FIRST END A
connection_typeTHREADED EXTERNAL TUBE FIRST END
connection_stylePLAIN (TUBE) FIRST END
style_designatorSTRAIGHT THRU W/BAFFLE
thread_directionRIGHT-HAND FIRST END
surface_treatmentANODIZE LOCATION NOT OTHERWISE SPECIFIED
operating_pressure200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
disk_loading_methodSPRING
flow_control_devicePOPPET
nominal_thread_size0.563 INCHES FIRST END IN
maximum_operating_temp250.0 FAHRENHEIT SINGLE RESPONSE DEGF
NSN4820-01-051-8215
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS SIZE: — · — · — PN: D559A-6D-50 · 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
MEDIA FOR WHICH DESIGNED: FUEL/OIL, HYDROCARBON FOURTH RESPONSE
DISK LOADING METHOD: SPRING
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR SEAT
STYLE DESIGNATOR: STRAIGHT THRU W/BAFFLE
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST END
FLOW CONTROL DEVICE: POPPET
MAXIMUM OPERATING TEMP: 250.0 FAHRENHEIT SINGLE RESPONSE DEGF
TECHNICAL CHARACTERISTICS (FLIS)
MEDIA FOR WHICH DESIGNEDFUEL/OIL, HYDROCARBON FOURTH RESPONSE
DISK LOADING METHODSPRING
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR SEAT
STYLE DESIGNATORSTRAIGHT THRU W/BAFFLE
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
FLOW CONTROL DEVICEPOPPET
MAXIMUM OPERATING TEMP250.0 FAHRENHEIT SINGLE RESPONSE DEGF
MEDIA FOR WHICH DESIGNEDAIR FIRST RESPONSE
VALVE OPERATION METHODAUTOMATIC
ADJUSTABLE PRESSURE RANGE+25.0 TO 75.0 POUNDS PER SQUARE INCH LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
39-78Interchangeable
interchangeable cross-reference
interchangeable
736GREENInterchangeable
interchangeable cross-reference
interchangeable
3850GREENInterchangeable
interchangeable cross-reference
interchangeable
B1047116Interchangeable
interchangeable cross-reference
interchangeable
70-2004-5996-7Interchangeable
interchangeable cross-reference
interchangeable
CORONAS DE POLICARBONATO N.302Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is D559A-6D-50?
D559A-6D-50 is a VALVE,SAFETY RELIEF.
What parts can replace D559A-6D-50?
There are 12 known substitutes for D559A-6D-50: 39-78, 736GREEN, 3850GREEN and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for D559A-6D-50?
D559A-6D-50 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-051-8215. This indicates validated use in U.S. government and defense supply chains.
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