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550541 — VALVE,SAFETY RELIEF

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

550541: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include end_item_identification: TAMIZ AIRCRAFT, part_name_assigned_by_controlling_agency: OUTSIDE AIR INDICATOR. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-887-1786, 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
550541
NSN: 4820-00-887-1786
NIINs: 008871786, 012500704, 015823975
FSC: 4820 — Valves, Nonpowered
CAGE: 11247 — LODESTONE CORP DIV OF FEDDERS CORP (USA)
SPECIFICATIONS
end_item_identificationTAMIZ AIRCRAFT
part_name_assigned_by_controlling_agencyOUTSIDE AIR INDICATOR
NSN4820-00-887-1786
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 550541 · 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
•
STYLE DESIGNATOR: STRAIGHT THRU
•
OPERATING PRESSURE: 385.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
VALVE OPERATION METHOD: AUTOMATIC
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORSTRAIGHT THRU
OPERATING PRESSURE385.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
SPECIAL FEATURES1-11 1/2 NPT THREAD 1.125 IN. LG IN
VALVE OPERATION METHODAUTOMATIC
SUBSTITUTES & CROSS-REFERENCES 5
B566-385Reference document
Same NSN cross-reference
Reference document — Secondary reference
PW1955ITEM34SH1Reference document
Same NSN cross-reference
Reference document — Secondary reference
B566S-385Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
MK1540Reference document
Same NSN cross-reference
Reference document — Secondary reference
B566Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 550541?
550541 is a VALVE,SAFETY RELIEF.
What parts can replace 550541?
There are 5 known substitutes for 550541: B566-385, PW1955ITEM34SH1, B566S-385 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 550541?
550541 is cataloged in the U.S. Government catalog under NSN 4820-00-887-1786. 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.