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Technical Data Sheet
PartsTable / COMPONENT / 21821N
21821N ✓ 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

VALVE,REGULATING,FLUID PRESSURE. Key specifications include filter: NOT INCLUDED, material: STEEL BODY, body_style: STRAIGHT THRU, regulation_type: AUTOMATIC SINGLE STAGE, flow_control_device: DIAPHRAGM, valve_loading_method: SPRING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-207-7042, 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
21821N
NSN: 4820-01-207-7042
FSC: 4820
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)
SPECIFICATIONS
filterNOT INCLUDED
materialSTEEL BODY
body_styleSTRAIGHT THRU
regulation_typeAUTOMATIC SINGLE STAGE
flow_control_deviceDIAPHRAGM
valve_loading_methodSPRING
face_to_face_distance8.500 INCHES NOMINAL IN
end_connection_quantity2
remote_actuation_methodPISTON
media_for_which_designedSTEAM
first_end_connection_typeRAISED FACE FLANGE
first_end_flange_thickness0.688 INCHES NOMINAL IN
NSN4820-01-207-7042
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 21821N · 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
•
FILTER: NOT INCLUDED
•
VALVE LOADING METHOD: SPRING
•
FIRST END RAISED FACE HEIGHT: 0.250 INCHES NOMINAL IN
•
FIRST END RAISED FACE DIAMETER: 2.000 INCHES NOMINAL IN
•
FIRST END STYLE DESIGNATOR: RAISED
•
MEDIA FOR WHICH DESIGNED: STEAM
•
FIRST END BOLT HOLE QUANTITY: 4
•
BODY STYLE: STRAIGHT THRU
TECHNICAL CHARACTERISTICS (FLIS)
FILTERNOT INCLUDED
VALVE LOADING METHODSPRING
FIRST END RAISED FACE HEIGHT0.250 INCHES NOMINAL IN
FIRST END RAISED FACE DIAMETER2.000 INCHES NOMINAL IN
FIRST END STYLE DESIGNATORRAISED
MEDIA FOR WHICH DESIGNEDSTEAM
FIRST END BOLT HOLE QUANTITY4
BODY STYLESTRAIGHT THRU
FIRST END FLANGE OUTSIDE DIAMETER4.875 INCHES NOMINAL IN
FIRST END FLANGE SHAPE STYLEROUND W/ BOLT HOLES
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
19728NInterchangeable
interchangeable cross-reference
interchangeable
19728N PIECE 17Interchangeable
interchangeable cross-reference
interchangeable
37971-24-85Interchangeable
interchangeable cross-reference
interchangeable
19728N 1INInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21821N?
21821N is a VALVE,REGULATING,FLUID PRESSURE.
What parts can replace 21821N?
There are 4 known substitutes for 21821N: 19728N, 19728N PIECE 17, 37971-24-85 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21821N?
21821N is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-207-7042. 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