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MC5209 — VALVE,SAFETY RELIEF

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

MC5209: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include thread_class: 3B ALL ENDS, connection_style: GASKET SEAL(BOSS) ALL ENDS, thread_direction: RIGHT-HAND ALL ENDS, disk_loading_method: SPRING, flow_control_device: POPPET, maximum_operating_temp: 275.0 FAHRENHEIT SECOND RESPONSE DEGF. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-083-1250, 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
MC5209
NSN: 4820-00-083-1250
FSC: 4820 — Valves, Nonpowered
CAGE: 76050 — EATON AEROSPACE LLC DBA STERER ENGINEERING DIV M.C.AEROSPACE (USA)
SPECIFICATIONS
thread_class3B ALL ENDS
connection_styleGASKET SEAL(BOSS) ALL ENDS
thread_directionRIGHT-HAND ALL ENDS
disk_loading_methodSPRING
flow_control_devicePOPPET
maximum_operating_temp275.0 FAHRENHEIT SECOND RESPONSE DEGF
valve_operation_methodAUTOMATIC
valve_discharge_flow_rate16.0 GALLONS PER MINUTE
NSN4820-00-083-1250
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: MC5209 · 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
•
CONNECTION STYLE: GASKET SEAL(BOSS) ALL ENDS
•
THREAD DIRECTION: RIGHT-HAND ALL ENDS
•
MAXIMUM OPERATING TEMP: 275.0 FAHRENHEIT SECOND RESPONSE DEGF
•
DISK LOADING METHOD: SPRING
•
THREAD CLASS: 3B ALL ENDS
•
VALVE DISCHARGE FLOW RATE: 16.0 GALLONS PER MINUTE
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEPOPPET
CONNECTION STYLEGASKET SEAL(BOSS) ALL ENDS
THREAD DIRECTIONRIGHT-HAND ALL ENDS
MAXIMUM OPERATING TEMP275.0 FAHRENHEIT SECOND RESPONSE DEGF
MAXIMUM OPERATING TEMP-65.0 FAHRENHEIT FIRST RESPONSE DEGF
DISK LOADING METHODSPRING
THREAD CLASS3B ALL ENDS
VALVE DISCHARGE FLOW RATE16.0 GALLONS PER MINUTE
VALVE OPERATION METHODAUTOMATIC
SUBSTITUTES & CROSS-REFERENCES 1
128SCH131-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Demilitarization required — mutilation
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FREQUENTLY ASKED QUESTIONS
What is MC5209?
MC5209 is a VALVE,SAFETY RELIEF.
What parts can replace MC5209?
There is 1 known substitute for MC5209: 128SCH131-1. Substitute compatibility should be verified for your specific system.
What is the NSN for MC5209?
MC5209 is cataloged in the U.S. Government catalog under NSN 4820-00-083-1250. 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.