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Technical Data Sheet
PartsTable / COMPONENT / MD8255
MD8255 ✓ 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 SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, overall_height: 0.609 INCHES NOMINAL IN, style_designator: PLAIN, seat_angle_in_deg: 0.750 NOMINAL, body_inside_diameter: 0.062 INCHES NOMINAL IN, body_outside_diameter: 0.435 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-363-8398, 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
MD8255
NSN: 4820-00-363-8398
FSC: 4820
CAGE: 76558 — MWM-MURPHY DIESEL CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
overall_height0.609 INCHES NOMINAL IN
style_designatorPLAIN
seat_angle_in_deg0.750 NOMINAL
body_inside_diameter0.062 INCHES NOMINAL IN
body_outside_diameter0.435 INCHES NOMINAL IN
seating_surface_shapeANGULAR
NSN4820-00-363-8398
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: MD8255 · 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
•
BODY OUTSIDE DIAMETER: 0.435 INCHES NOMINAL IN
•
SEATING SURFACE SHAPE: ANGULAR
•
STYLE DESIGNATOR: PLAIN
•
MATERIAL: STEEL OVERALL
•
BODY INSIDE DIAMETER: 0.062 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 0.750 NOMINAL
TECHNICAL CHARACTERISTICS (FLIS)
BODY OUTSIDE DIAMETER0.435 INCHES NOMINAL IN
SEATING SURFACE SHAPEANGULAR
STYLE DESIGNATORPLAIN
MATERIALSTEEL OVERALL
BODY INSIDE DIAMETER0.062 INCHES NOMINAL IN
OVERALL HEIGHT0.609 INCHES NOMINAL IN
SEAT ANGLE IN DEG0.750 NOMINAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
3208XIAInterchangeable
interchangeable cross-reference
interchangeable
903208Interchangeable
interchangeable cross-reference
interchangeable
30D86Interchangeable
interchangeable cross-reference
interchangeable
8255Interchangeable
interchangeable cross-reference
interchangeable
4133800-021Interchangeable
interchangeable cross-reference
interchangeable
MS90085-6Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MD8255?
MD8255 is a SEAT,VALVE.
What parts can replace MD8255?
There are 21 known substitutes for MD8255: 3208XIA, 903208, 30D86 and 18 more. Substitute compatibility should be verified for your specific system.
Is MD8255 still available?
MD8255 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026