PartsTable
Technical Data Sheet
577A1-4D-30 ✓ 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 BODY, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL BOSS ALL ENDS, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS, style_designator: STRAIGHT THRU, thread_direction: RIGHT-HAND ALL ENDS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-350-3686, 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
577A1-4D-30
NSN: 4820-01-350-3686
FSC: 4820
CAGE: 91816 — CIRCOR AEROSPACE, INC. DBA CIRCOR AEROSPACE INC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY BODY
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL BOSS ALL ENDS
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
style_designatorSTRAIGHT THRU
thread_directionRIGHT-HAND ALL ENDS
surface_treatmentANODIZE LOCATION NOT OTHERWISE SPECIFIED
disk_loading_methodSPRING
flow_control_deviceDISK
nominal_thread_size0.438 INCHES ALL ENDS IN
maximum_operating_temp180.0 FAHRENHEIT SINGLE RESPONSE DEGF
valve_operation_methodAUTOMATIC
NSN4820-01-350-3686
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS SIZE: — · — · — PN: 577A1-4D-30 · 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
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
VALVE DISCHARGE FLOW RATE: 0.7 GALLONS PER MINUTE
THREAD QUANTITY PER INCH: 20 ALL ENDS
DISK LOADING METHOD: SPRING
VALVE OPERATION METHOD: AUTOMATIC
FLOW CONTROL DEVICE: DISK
THREAD CLASS: 3A ALL ENDS A
OPENING PRESSURE SETTING: 30.0 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
VALVE DISCHARGE FLOW RATE0.7 GALLONS PER MINUTE
THREAD QUANTITY PER INCH20 ALL ENDS
DISK LOADING METHODSPRING
VALVE OPERATION METHODAUTOMATIC
FLOW CONTROL DEVICEDISK
THREAD CLASS3A ALL ENDS A
OPENING PRESSURE SETTING30.0 POUNDS PER SQUARE INCH LBS
SURFACE TREATMENTANODIZE LOCATION NOT OTHERWISE SPECIFIED
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT (UNJ) ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
334-12Interchangeable
interchangeable cross-reference
interchangeable
334-220Interchangeable
interchangeable cross-reference
interchangeable
34037299-103Interchangeable
interchangeable cross-reference
interchangeable
334220P01Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 577A1-4D-30?
577A1-4D-30 is a VALVE,SAFETY RELIEF.
What parts can replace 577A1-4D-30?
There are 4 known substitutes for 577A1-4D-30: 334-12, 334-220, 34037299-103 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 577A1-4D-30?
577A1-4D-30 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-350-3686. This indicates validated use in U.S. government and defense supply chains.
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