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PartsTable / COMPONENT / W1-91 ITEM 85.4
W1-91 ITEM 85.4 ✓ 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

The W1-91 ITEM 85.4 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-218-7785, 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
W1-91 ITEM 85.4
NSN: 4820-01-218-7785
FSC: 4820
CAGE: K2182 — DAVID BROWN GEAR SYSTEMS LIMITED (GBR)
SPECIFICATIONS
Part NumberW1-91 ITEM 85.4
NSN4820-01-218-7785
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: W1-91 ITEM 85.4 · 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
•
OUTSIDE DIAMETER: 4.950 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN
•
INSIDE DIAMETER: 2.545 INCHES NOMINAL IN
•
MATERIAL: CORK
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER4.950 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN
INSIDE DIAMETER2.545 INCHES NOMINAL IN
MATERIALCORK
OVERALL HEIGHT0.259 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
657658Interchangeable
interchangeable cross-reference
interchangeable
43007018-4Interchangeable
interchangeable cross-reference
interchangeable
OL-6839Interchangeable
interchangeable cross-reference
interchangeable
14104Interchangeable
interchangeable cross-reference
interchangeable
BD104Interchangeable
interchangeable cross-reference
interchangeable
CIL58-8Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is W1-91 ITEM 85.4?
W1-91 ITEM 85.4 is a W1-91 ITEM 85.4.
What parts can replace W1-91 ITEM 85.4?
There are 11 known substitutes for W1-91 ITEM 85.4: 657658, 43007018-4, OL-6839 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for W1-91 ITEM 85.4?
W1-91 ITEM 85.4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-218-7785. 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