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101B209CY-1 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

101B209CY-1: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL BODY, seat_radius: 0.381 INCHES MINIMUM AND 0.387 INCHES MAXIMUM IN, flange_diameter: 2.501 INCHES NOMINAL IN, style_designator: PLAIN FLANGED, under_flange_height: 1.678 INCHES MINIMUM AND 1.682 INCHES MAXIMUM IN, body_inside_diameter: 1.649 INCHES MINIMUM AND 1.655 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-974-3948, 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
101B209CY-1
NSN: 4820-00-974-3948
FSC: 4820 — Valves, Nonpowered
CAGE: 03502 — GENERAL ELECTRIC CO NAVAL AND DRIVE TURBINE SYSTEMS DEPT (USA)
SPECIFICATIONS
materialSTEEL BODY
seat_radius0.381 INCHES MINIMUM AND 0.387 INCHES MAXIMUM IN
flange_diameter2.501 INCHES NOMINAL IN
style_designatorPLAIN FLANGED
under_flange_height1.678 INCHES MINIMUM AND 1.682 INCHES MAXIMUM IN
body_inside_diameter1.649 INCHES MINIMUM AND 1.655 INCHES MAXIMUM IN
taper_major_diameter1.649 INCHES MINIMUM AND 1.655 INCHES MAXIMUM IN
taper_minor_diameter1.281 INCHES NOMINAL IN
body_outside_diameter1.963 INCHES MINIMUM AND 1.973 INCHES MAXIMUM IN
seating_surface_shapeRADIAL
flange_seat_to_disk_end_height0.498 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-763,CLASS 410 FED SPEC SINGLE MATERIAL RESPONSE BODY
NSN4820-00-974-3948
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 101B209CY-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
•
FLANGE SEAT TO DISK END HEIGHT: 0.498 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
•
FLANGE DIAMETER: 2.501 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 1.963 INCHES MINIMUM AND 1.973 INCHES MAXIMUM IN
•
TAPER MINOR DIAMETER: 1.281 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN FLANGED
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-17131,TYPE MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE FACE
•
TAPER MAJOR DIAMETER: 1.649 INCHES MINIMUM AND 1.655 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.498 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
FLANGE DIAMETER2.501 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER1.963 INCHES MINIMUM AND 1.973 INCHES MAXIMUM IN
TAPER MINOR DIAMETER1.281 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN FLANGED
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-17131,TYPE MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE FACE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763,CLASS 410 FED SPEC SINGLE MATERIAL RESPONSE BODY
TAPER MAJOR DIAMETER1.649 INCHES MINIMUM AND 1.655 INCHES MAXIMUM IN
BODY INSIDE DIAMETER1.649 INCHES MINIMUM AND 1.655 INCHES MAXIMUM IN
SEAT RADIUS0.381 INCHES MINIMUM AND 0.387 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES 2
101B209CYReference document
Same NSN cross-reference
Reference document — Design control — primary reference
101B209CYPC1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 101B209CY-1?
101B209CY-1 is a SEAT,VALVE.
What parts can replace 101B209CY-1?
There are 2 known substitutes for 101B209CY-1: 101B209CY, 101B209CYPC1. Substitute compatibility should be verified for your specific system.
What is the NSN for 101B209CY-1?
101B209CY-1 is cataloged in the U.S. Government catalog under NSN 4820-00-974-3948. 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.