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Technical Data Sheet
PartsTable / COMPONENT / MD8256
MD8256 ✓ 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, flange_diameter: 0.622 INCHES NOMINAL IN, style_designator: PLAIN FLANGED, under_flange_height: 0.090 INCHES NOMINAL IN, body_inside_diameter: 0.088 INCHES NOMINAL IN, body_outside_diameter: 0.293 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-363-8397, 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
MD8256
NSN: 4820-00-363-8397
FSC: 4820
CAGE: 76558 — MWM-MURPHY DIESEL CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
flange_diameter0.622 INCHES NOMINAL IN
style_designatorPLAIN FLANGED
under_flange_height0.090 INCHES NOMINAL IN
body_inside_diameter0.088 INCHES NOMINAL IN
body_outside_diameter0.293 INCHES NOMINAL IN
seating_surface_shapeFLAT
flange_seat_to_disk_end_height0.108 INCHES NOMINAL IN
NSN4820-00-363-8397
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: MD8256 · 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
•
UNDER FLANGE HEIGHT: 0.090 INCHES NOMINAL IN
•
SEATING SURFACE SHAPE: FLAT
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: PLAIN FLANGED
•
FLANGE SEAT TO DISK END HEIGHT: 0.108 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 0.293 INCHES NOMINAL IN
•
FLANGE DIAMETER: 0.622 INCHES NOMINAL IN
•
BODY INSIDE DIAMETER: 0.088 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
UNDER FLANGE HEIGHT0.090 INCHES NOMINAL IN
SEATING SURFACE SHAPEFLAT
MATERIALSTEEL OVERALL
STYLE DESIGNATORPLAIN FLANGED
FLANGE SEAT TO DISK END HEIGHT0.108 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER0.293 INCHES NOMINAL IN
FLANGE DIAMETER0.622 INCHES NOMINAL IN
BODY INSIDE DIAMETER0.088 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
AW-714Interchangeable
interchangeable cross-reference
interchangeable
427524C92Interchangeable
interchangeable cross-reference
interchangeable
P256Interchangeable
interchangeable cross-reference
interchangeable
8256Interchangeable
interchangeable cross-reference
interchangeable
213RN07FITInterchangeable
interchangeable cross-reference
interchangeable
700457Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MD8256?
MD8256 is a SEAT,VALVE.
What parts can replace MD8256?
There are 20 known substitutes for MD8256: AW-714, 427524C92, P256 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MD8256?
MD8256 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-363-8397. 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