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21218-850-1 — SLEEVE AND SLIDE,DIRECTIONAL CON

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

21218-850-1: SLEEVE AND SLIDE,DIRECTIONAL CON.

SLEEVE AND SLIDE,DIRECTIONAL CON. Key specifications include slide_material: STEEL, sleeve_material: STEEL, special_features: VALVE SIZE 3IN. IN, end_item_identification: SEAWOLF CLASS SSN, valve_design_control_activity: 78062, valve_model_number_for_which_designed: 21218.

This part is cataloged in the U.S. Government catalog under NSN 4820-01-418-9542, 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
21218-850-1
NSN: 4820-01-418-9542
FSC: 4820 — Valves, Nonpowered
CAGE: 78062 — SARGENT AEROSPACE & DEFENSE, LLC DBA SARGENT CONTROLS & AEROSPACE DIV SARGENT CONTROLS & AEROSPACE (USA)
SPECIFICATIONS
slide_materialSTEEL
sleeve_materialSTEEL
special_featuresVALVE SIZE 3IN. IN
end_item_identificationSEAWOLF CLASS SSN
valve_design_control_activity78062
valve_model_number_for_which_designed21218
NSN4820-01-418-9542
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 21218-850-1 · 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
•
VALVE MODEL NUMBER FOR WHICH DESIGNED: 21218
•
SLIDE MATERIAL: STEEL
•
SLEEVE MATERIAL: STEEL
•
VALVE DESIGN CONTROL ACTIVITY: 78062
TECHNICAL CHARACTERISTICS
VALVE MODEL NUMBER FOR WHICH DESIGNED21218
SLIDE MATERIALSTEEL
SPECIAL FEATURESVALVE SIZE 3IN. IN
SLEEVE MATERIALSTEEL
VALVE DESIGN CONTROL ACTIVITY78062
END ITEM IDENTIFICATIONSEAWOLF CLASS SSN
SUBSTITUTES & CROSS-REFERENCES 2
21218-2Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
21218Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
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 21218-850-1?
21218-850-1 is a SLEEVE AND SLIDE,DIRECTIONAL CON.
What parts can replace 21218-850-1?
There are 2 known substitutes for 21218-850-1: 21218-2, 21218. Substitute compatibility should be verified for your specific system.
What is the NSN for 21218-850-1?
21218-850-1 is cataloged in the U.S. Government catalog under NSN 4820-01-418-9542. 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.