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561-021 — VALVE,RESTRICTOR CHECK

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

561-021: VALVE,RESTRICTOR CHECK.

The VALVE,RESTRICTOR CHECK is a the manufacturer industrial component. Key specifications include end_item_identification: 29158603736. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-294-1565, 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
561-021
NSN: 4820-00-294-1565
NIINs: 002941565, 007379192, 013725170
FSC: 4820 — Valves, Nonpowered
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
end_item_identification29158603736
general_characteristics_item_descriptionCRES,UNITED ACFT CORP SPEC NO. HS178,ROCKWELL HARDNESS SUPERFICIAL RS75-83.5 R15N,IRREGULAR SHAPE,FLANGE TYPE,1.500 IN. MIN,1.540 IN. MAX OD OF FLANGE,0.680 IN. MIN,0.710 IN. MAX O/A LG IN
NSN4820-00-294-1565
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 561-021 · 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
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
STYLE DESIGNATOR: STRAIGHT THRU
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE BODY
•
MAXIMUM OPERATING TEMP: 120.0 FAHRENHEIT SINGLE RESPONSE DEGF
•
DISK LOADING METHOD: SPRING
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEPOPPET
CRITICALITY CODE JUSTIFICATIONFEAT
STYLE DESIGNATORSTRAIGHT THRU
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE BODY
MAXIMUM OPERATING TEMP120.0 FAHRENHEIT SINGLE RESPONSE DEGF
DISK LOADING METHODSPRING
SPECIAL FEATURESWEAPON SYSTEM ESSENTIAL
END ITEM IDENTIFICATIONF-15 EAGLE AIRCRAFT
MATERIALSTEEL COMP 630 BODY
VALVE OPERATION METHODAUTOMATIC
SUBSTITUTES & CROSS-REFERENCES 1
7M848-2Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Demilitarization required — critical (Q)
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FREQUENTLY ASKED QUESTIONS
What is 561-021?
561-021 is a VALVE,RESTRICTOR CHECK.
What parts can replace 561-021?
There is 1 known substitute for 561-021: 7M848-2. Substitute compatibility should be verified for your specific system.
What is the NSN for 561-021?
561-021 is cataloged in the U.S. Government catalog under NSN 4820-00-294-1565. 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.