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D139-18-941 — VALVE,BUTTERFLY

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

D139-18-941: VALVE,BUTTERFLY.

The VALVE,BUTTERFLY is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY FLOW CONTROL DEVICE, valve_size: 18.000 INCHES IN, style_designator: STRAIGHT THRU, mounting_facility: WAFER, valve_operation_method: MANUAL, end_item_identification: STRATEGIC SEALIFT CONVERSION SHIPS CLASS. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-421-3481, 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
D139-18-941
NSN: 4820-01-421-3481
FSC: 4820 — Valves, Nonpowered
CAGE: 04613 — EMERSON AUTOMATION SOLUTIONS FINAL CONTROL US LP (USA)
SPECIFICATIONS
materialNICKEL ALLOY FLOW CONTROL DEVICE
valve_size18.000 INCHES IN
style_designatorSTRAIGHT THRU
mounting_facilityWAFER
valve_operation_methodMANUAL
end_item_identificationSTRATEGIC SEALIFT CONVERSION SHIPS CLASS
media_for_which_designedWATER, SALT SINGLE RESPONSE
NSN4820-01-421-3481
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: D139-18-941 · 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
•
STYLE DESIGNATOR: STRAIGHT THRU
•
VALVE SIZE: 18.000 INCHES IN
•
MOUNTING FACILITY: WAFER
•
MEDIA FOR WHICH DESIGNED: WATER, SALT SINGLE RESPONSE
•
MATERIAL: NICKEL ALLOY STEM
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORSTRAIGHT THRU
VALVE SIZE18.000 INCHES IN
MOUNTING FACILITYWAFER
MEDIA FOR WHICH DESIGNEDWATER, SALT SINGLE RESPONSE
END ITEM IDENTIFICATIONSTRATEGIC SEALIFT CONVERSION SHIPS CLASS
MATERIALNICKEL ALLOY STEM
MATERIALNICKEL ALLOY FLOW CONTROL DEVICE
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR SEAT
MATERIALCOPPER ALLOY 958 BODY
VALVE OPERATION METHODMANUAL
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

No substitute or cross-reference records for this part.

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 D139-18-941?
D139-18-941 is a VALVE,BUTTERFLY.
What is the NSN for D139-18-941?
D139-18-941 is cataloged in the U.S. Government catalog under NSN 4820-01-421-3481. 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.