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BK183A1371 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

BK183A1371: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, flange_diameter: 4.309 INCHES MINIMUM AND 4.315 INCHES MAXIMUM IN, style_designator: PLAIN FLANGED, seat_angle_in_deg: 45.000 NOMINAL, under_flange_height: 0.812 INCHES NOMINAL IN, body_inside_diameter: 2.000 INCHES MINIMUM AND 2.002 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-057-2106, 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
BK183A1371
NSN: 4820-00-057-2106
FSC: 4820 — Valves, Nonpowered
CAGE: 0BR59 — SIEMENS GOVERNMENT TECHNOLOGIES, INC. DBA SGT DRESSER-RAND DIV SGT DRESSER-RAND (USA)
SPECIFICATIONS
materialSTEEL OVERALL
flange_diameter4.309 INCHES MINIMUM AND 4.315 INCHES MAXIMUM IN
style_designatorPLAIN FLANGED
seat_angle_in_deg45.000 NOMINAL
under_flange_height0.812 INCHES NOMINAL IN
body_inside_diameter2.000 INCHES MINIMUM AND 2.002 INCHES MAXIMUM IN
body_outside_diameter3.118 INCHES MINIMUM AND 3.121 INCHES MAXIMUM IN
seating_surface_shapeANGULAR
flange_seat_to_disk_end_height0.469 INCHES NOMINAL IN
material_document_and_classificationFED STD 66,AISI 416/SAE 51416 FED STD SINGLE MATERIAL RESPONSE OVERALL
NSN4820-00-057-2106
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: BK183A1371 · 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: 0.469 INCHES NOMINAL IN
•
FLANGE DIAMETER: 4.309 INCHES MINIMUM AND 4.315 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 3.118 INCHES MINIMUM AND 3.121 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: PLAIN FLANGED
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66,AISI 416/SAE 51416 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
BODY INSIDE DIAMETER: 2.000 INCHES MINIMUM AND 2.002 INCHES MAXIMUM IN
•
UNDER FLANGE HEIGHT: 0.812 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.469 INCHES NOMINAL IN
FLANGE DIAMETER4.309 INCHES MINIMUM AND 4.315 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER3.118 INCHES MINIMUM AND 3.121 INCHES MAXIMUM IN
STYLE DESIGNATORPLAIN FLANGED
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66,AISI 416/SAE 51416 FED STD SINGLE MATERIAL RESPONSE OVERALL
BODY INSIDE DIAMETER2.000 INCHES MINIMUM AND 2.002 INCHES MAXIMUM IN
UNDER FLANGE HEIGHT0.812 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
SEAT ANGLE IN DEG45.000 NOMINAL
SEATING SURFACE SHAPEANGULAR
SUBSTITUTES & CROSS-REFERENCES 2
717004Reference document
Same NSN cross-reference
Reference document — Secondary reference
NB3027PC183Same 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 BK183A1371?
BK183A1371 is a SEAT,VALVE.
What parts can replace BK183A1371?
There are 2 known substitutes for BK183A1371: 717004, NB3027PC183. Substitute compatibility should be verified for your specific system.
What is the NSN for BK183A1371?
BK183A1371 is cataloged in the U.S. Government catalog under NSN 4820-00-057-2106. 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.