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Technical Data Sheet
PartsTable / COMPONENT / 221577-001
221577-001 ✓ 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 DISK,VALVE is a the manufacturer industrial component. Key specifications include special_features: 4.750 IN. OD; 0.203 IN.

W IN. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-184-1203, 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
221577-001
NSN: 4820-01-184-1203
FSC: 4820
CAGE: 95802 — AIR SYSTEMS COMPONENTS INC DBA AIR SYSTEM COMPONENTS INC DIV TRION IAQ DIV (USA)
SPECIFICATIONS
special_features4.750 IN. OD; 0.203 IN. W IN
NSN4820-01-184-1203
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 221577-001 · 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
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURES4.750 IN. OD; 0.203 IN. W IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
MS27125-20Interchangeable
interchangeable cross-reference
interchangeable
321300Interchangeable
interchangeable cross-reference
interchangeable
9171 PIECE 42Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 221577-001?
221577-001 is a DISK,VALVE.
What parts can replace 221577-001?
There are 3 known substitutes for 221577-001: MS27125-20, 321300, 9171 PIECE 42. Substitute compatibility should be verified for your specific system.
What is the NSN for 221577-001?
221577-001 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-184-1203. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026