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21851N PC 19 — VALVE,DIAPHRAGM,STOP

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

21851N PC 19: VALVE,DIAPHRAGM,STOP.

The VALVE,DIAPHRAGM,STOP is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY, overall_length: 2.563 INCHES NOMINAL IN, bore_counterbore: NOT INCLUDED, bore_countersink: NOT INCLUDED, outside_diameter: 5.240 INCHES NOMINAL IN, style_designator: PLAIN, SHOULDERED. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-447-1161, 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
21851N PC 19
NSN: 4820-01-447-1161
FSC: 4820 — Valves, Nonpowered
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY
overall_length2.563 INCHES NOMINAL IN
bore_counterboreNOT INCLUDED
bore_countersinkNOT INCLUDED
outside_diameter5.240 INCHES NOMINAL IN
style_designatorPLAIN, SHOULDERED
bb_end_shank_diameter2.125 INCHES NOMINAL IN
major_diameter_length2.000 INCHES NOMINAL IN
end_item_identificationNIMITZ CLASS CVN
NSN4820-01-447-1161
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 21851N PC 19 · 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
•
MAJOR DIAMETER LENGTH: 2.000 INCHES NOMINAL IN
•
BB END SHANK DIAMETER: 2.125 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN, SHOULDERED
•
BORE COUNTERBORE: NOT INCLUDED
•
OUTSIDE DIAMETER: 5.240 INCHES NOMINAL IN
•
MATERIAL: NICKEL ALLOY
TECHNICAL CHARACTERISTICS
MAJOR DIAMETER LENGTH2.000 INCHES NOMINAL IN
BB END SHANK DIAMETER2.125 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN, SHOULDERED
OVERALL LENGTH2.563 INCHES NOMINAL IN
BORE COUNTERBORENOT INCLUDED
OUTSIDE DIAMETER5.240 INCHES NOMINAL IN
END ITEM IDENTIFICATIONNIMITZ CLASS CVN
MATERIALNICKEL ALLOY
BORE COUNTERSINKNOT INCLUDED
SUBSTITUTES & CROSS-REFERENCES 2
21851NReference document
Same NSN cross-reference
Reference document — Drawing number reference only
46979Reference 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 21851N PC 19?
21851N PC 19 is a VALVE,DIAPHRAGM,STOP.
What parts can replace 21851N PC 19?
There are 2 known substitutes for 21851N PC 19: 21851N, 46979. Substitute compatibility should be verified for your specific system.
What is the NSN for 21851N PC 19?
21851N PC 19 is cataloged in the U.S. Government catalog under NSN 4820-01-447-1161. 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.