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311903-27 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

311903-27: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 302 OVERALL, flange_diameter: 0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN, style_designator: PLAIN FLANGED, under_flange_height: 0.114 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN, body_inside_diameter: 0.114 INCHES MINIMUM AND 0.118 INCHES MAXIMUM IN, fsc_application_data: ENVIRONMENTAL CONTROL SYSTEM. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-116-1293, 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
311903-27
NSN: 4820-01-116-1293
FSC: 4820 — Valves, Nonpowered
CAGE: 59364 — HONEYWELL INTERNATIONAL INC. DBA HONEYWELL INTERNATIONAL DIV AEROSPACE - TEMPE (WEST WARNER ROAD) (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OVERALL
flange_diameter0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
style_designatorPLAIN FLANGED
under_flange_height0.114 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
body_inside_diameter0.114 INCHES MINIMUM AND 0.118 INCHES MAXIMUM IN
fsc_application_dataENVIRONMENTAL CONTROL SYSTEM
body_outside_diameter0.264 INCHES MINIMUM AND 0.269 INCHES MAXIMUM IN
seating_surface_shapeFLAT
flange_seat_to_disk_end_height0.175 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
material_document_and_classificationMIL-S-7720 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4820-01-116-1293
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 311903-27 · 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: 0.175 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
•
FLANGE DIAMETER: 0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
FSC APPLICATION DATA: ENVIRONMENTAL CONTROL SYSTEM
•
BODY OUTSIDE DIAMETER: 0.264 INCHES MINIMUM AND 0.269 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: PLAIN FLANGED
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-7720 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
BODY INSIDE DIAMETER: 0.114 INCHES MINIMUM AND 0.118 INCHES MAXIMUM IN
•
UNDER FLANGE HEIGHT: 0.114 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.175 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
FLANGE DIAMETER0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
FSC APPLICATION DATAENVIRONMENTAL CONTROL SYSTEM
BODY OUTSIDE DIAMETER0.264 INCHES MINIMUM AND 0.269 INCHES MAXIMUM IN
STYLE DESIGNATORPLAIN FLANGED
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7720 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
BODY INSIDE DIAMETER0.114 INCHES MINIMUM AND 0.118 INCHES MAXIMUM IN
UNDER FLANGE HEIGHT0.114 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
MATERIALSTEEL COMP 302 OVERALL
SEATING SURFACE SHAPEFLAT
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 1
10124536Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandDemilitarization required — mutilation
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FREQUENTLY ASKED QUESTIONS
What is 311903-27?
311903-27 is a SEAT,VALVE.
What parts can replace 311903-27?
There is 1 known substitute for 311903-27: 10124536. Substitute compatibility should be verified for your specific system.
What is the NSN for 311903-27?
311903-27 is cataloged in the U.S. Government catalog under NSN 4820-01-116-1293. 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.